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A new 3D Cd(II) coordination polymer, {[Cd2(btc)(HL)(H2O)]·3H2O}n (1) (H2L= 3-(1H-pyrazol-4-yl)-5-(pyridin-2-yl)-1, 2, 4-triazole; H3btc = 1,3,5-benzenetricarboxylic acid), has been synthesized by ...

Two unique lanthanide coordination polymers, namely, {[Ln2(μ3-OH)2(Tfpht)2 (H2O)2·0.5bipy]}n (Ln = Gd (1) and Eu (2), H2Tfpht = 3,4,5,6-Tetrafluorophthalic acid, bipy = 4,4′-bipyridine) have been afforded successfully. The coordination polymers 1 and 2 are isostructural and have the same phase, both crystallizing in the triclinic system, with space group of P−1. They both exhibit one-dimensional (1-D) ribbon-double chains composed of trinuclear lanthanide clusters bridged by μ3-hydroxyl bridges and carboxyl oxygen atoms of Tfpht2− ligands, and the chains are further linked by hydrogen bonding interactions to give rise to a 2-D corrugated layer. The solid state luminescence emission spectra of coordination polymer 1 is based on the H2Tfpht acid ligand, whereas 2 displays the characteristic f-f transitions of Eu(III) ions. The direct-current (dc) magnetic susceptibility studies reveal the weak ferromagnetic interaction between the Gd(III) ions in coordination polymer 1.

Two nickel (II) complexes, [Ni(Hcdcp) (H2O)3] (1) (H3cdcp = 3-(4-carboxylatephenyl)-2,6-pyridinedicarboxylic acid) and [Ni3(Hdcdcp)2(H2O)6]n (2) (H4dcdcp = 3-(2,4-dicarboxylatephenyl)-2,6-pyridinedicarboxylic acid) have been synthesized under hydrothermal conditions and characterized by elemental analysis and single-crystal X-ray diffraction. For complex 1, Ni(II) ion is coordinated by three water molecules and a deprotonated H3cdcp ligand in chelate mode to form a mononuclear complex; for complex 2, three Ni(II) ions are connected into trinuclear clusters which are further linked into 2D layers by pentadentate Hdcdcp3− ligands in alternant bis-(bridging) and chelate coordination modes; the two complexes are both extend to 3D supramolecular polymers by hydrogen bonds. Thermogravimetric analysis (TGA) and powder X-ray diffraction (PXRD) are also carried out to determine their thermal stability and phase purity. Magnetic measurement for complex 2 reveals that weak antiferromagnetic interactions occur between the bridging trinuclear Ni( II ) ions.

Food coloring is often used as a coloring agent in foods, medicines and cosmetics, and it was reported to have certain carcinogenic and mutagenic effects in living organisms. Investigation of physiological parameters using zebrafish is a promising methodology to understand disease biology and drug toxicity for various drug discovery on humans. Zebrafish (Danio rerio) is a well-acknowledged model organism with combining assets such as body transparency, small size, low cost of cultivation, and high genetic homology with humans and is used as a specimen tool for the in-vivo throughput screening approach. In addition, recent advances in microfluidics show a promising alternative for zebrafish manipulation in terms of drug administration and extensive imaging capability. This pilot work highlighted the design and development of a microfluidic detection platform for zebrafish larvae through investigating the effects of food coloring on cardiovascular functionality and pectoral fin swing ability. The zebrafish embryos were exposed to the Cochineal Red and Brilliant Blue FCF pigment solution in a concentration of (0.02‰, 0.2‰) cultured in the laboratory from the embryo stage to hatching and development until 9 days post fertilization (d.p.f.). In addition, zebrafish swimming behaviors in terms of pectoral fin beating towards the toxicity screening were further studied by visualizing the induced flow field. It was evidenced that Cochineal Red pigment at a concentration of 0.2‰ not only significantly affected the zebrafish pectoral fin swing behavior, but also significantly increased the heart rate of juvenile fish. The higher concentration of Brilliant Blue FCF pigment (0.2%) increased heart rate during early embryonic stages of zebrafish. However, zebrafish exposed to food coloring did not show any significant changes in cardiac output. The applications of this proposed platform can be further extended towards observing the neurobiological/hydrodynamic behaviors of zebrafish larvae for practical applications in drug tests.

C26H21N6O6.5Zn, monoclinic, C2/c (no. 15), a = 18.3123(3) Å, b = 8.97463(15) Å, c = 30.1437(5) Å, β = 99.5396(16)°, V = 4885.51(14) Å3, Z = 4, R gt(F) = 0.0352, wR ref(F 2) = 0.0746, T = 293(2) K.

Three polyacetylenes were isolated and purified from Platycodon grandiflorum A. DC for the first time by high-speed counter-current chromatography using a two-phase solvent system composed of hexane/ethyl acetate/methanol/water (1:31:1:31, v/v/v/v) and high-performance liquid chromatography with an Agilent ZORBAX® SB-C18 column (4.6 mm × 150 mm, 5 μm). After separation by high-speed counter-current chromatography and high-performance liquid chromatography, we obtained 3.5 mg of platetyolin A, 4.1 mg of platetyolin B, and 18.1 mg of lobetyolin with purities of 97.2, 96.7, and 96.9%, respectively. The purity of each compound was assessed by high-performance liquid chromatography and the chemical structures were evaluated by high-resolution electrospray ionization time-of-flight mass spectrometry and one- and two-dimensional NMR spectroscopy. Among the isolated compounds, platetyolin A and platetyolin B are newly reported compounds. This article is protected by copyright. All rights reserved

C32H28N4O5Mn, monoclinic, P21/c (no. 14), a = 8.777(3) Å, b = 30.975(11) Å, c = 10.229(4) Å, β = 105.412(7)°, V = 2680.9(16) Å3, Z = 4, R gt(F) = 0.0448, wR ref(F 2) = 0.1136, T = 296(2) K.

C36H44N8NiO12, triclinic, P1̅ (no. 2), a = 10.6451(5) Å, b = 12.1086(6) Å, c = 17.2600(7) Å, α = 76.624(4)°, β = 72.200(4)°, γ = 70.802(5)°, V = 1979.18(18) Å3, Z = 2, R gt(F) = 0.0414, wR ref(F 2) = 0.1058, T = 293(2) K.

Furosine (N&epsilon, (2-furoylmethyl)-l-lysine) is formed during the early stages of the Maillard reaction from a lysine Amadori compound and is frequently used as a marker of reaction progress. Furosine is toxic, with significant effects on animal livers, kidneys, and other organs. However, reports on the formation of furosine in processed velvet antler are scarce. In this study, we have quantified the furosine content in processed velvet antler by using UPLC-MS/MS. The furosine contents of velvet antler after freeze-drying, boiling, and processing without and with blood were 148.51&ndash, 193.93, 168.10&ndash, 241.22, 60.29&ndash, 80.33, and 115.18&ndash, 138.99 mg/kg protein, respectively. The factors affecting furosine formation in processed velvet antler, including reducing sugars, proteins, amino acids, and process temperature, are discussed herein. Proteins, amino acids, and reducing sugars are substrates for the Maillard reaction and most significantly influence the furosine content in the processed velvet antler. High temperatures induce the production of furosine in boiled velvet antler but not in the freeze-dried samples, whereas more furosine is produced in velvet antler processed with blood, which is rich in proteins, amino acids, and reducing sugars, than in the samples processed without blood. Finally, wax slices rich in proteins, amino acids, and reducing sugars produced more furosine than the other parts of the velvet antler. These data provide a reference for guiding the production of low-furosine velvet antler and can be used to estimate the consumer intake of furosine from processed velvet antler.

A new Zinc(II) coordination polymer, {[Zn(ip)(H2L)]·4H2O}n [H2ip = isophthalic acid; H2L = 3-(1H-pyrazol-4-yl)-5-(pyridin-2-yl)-1,2,4-triazole], is reported here. It has been structurally characterized by X-ray single crystal analysis, IR spectra, fluorescence spectroscopy, thermogravimetry analysis and X-ray powder diffraction patterns. It belongs to the triclinic system, space group P-1 with a = 8.7934(3) Å, b = 10.1639(3) Å, c = 12.3203(5) Å, α = 75.174(3)°, β = 81.739(3)°, γ = 79.578(4)°, V = 1041.40(7) Å3, Z = 2, Dc = 1.638 g/cm3, Mr = 513.77, F(000) = 528, R = 0.0344 and wR = 0.0798. The single X-ray diffraction studies reveal that the compound exhibits 2D layer structure. Moreover, thermal behavior and luminescence properties of the compound were also studied.

Based on 8-hydroxyquinoline Schiff base derivative and auxiliary ligand β-diketonate, two new dinuclear lanthanide complexes [Gd2(L1)2(bfac)4] (1) and [Dy2(L2)2(acac)2(CH3OH)2]•CH3OH (2) (HL1 = 2-[((4-phenethyl)-imino)methyl]-8-hydroxyquinoline, H2L2 = 2-[((4-methyl)-2-(arboxyl)-imino)]methyl]-8-hydroxyquinoline, Hbfac = hexafluoroacetylacetonate, Hacac = acetylacetonate,) were successfully isolated and characterized. Structural analysis reveal that complexes 1 and 2 both contain a binuclear Ln2 cluster, in which two eight-coordinated Ln(III) ions are located in distorted dodecahedral geometry and bridged by phenoxide oxygen atom. In addition, their magnetic properties are investigated in detail. The results suggest that ferromagnetic interactions between adjacent Gd3+ ions can be observed in 1, which exhibits remarkable magnetic refrigeration properties with -ΔSmax = 17.74 J kg−1 K−1 (T = 2.0 K and ΔH = 7.0 T). Complex 2 displays slow magnetic relaxation behaviors with ΔE/kB ≈ 2.16 K and τ0 ≈ 1.38 × 10−5 s.

The tetranuclear nickel cluster {[Ni4(L)4(C2H5OH)4]·7H2O} (1) was synthesized based on the tridentate Schiff base ligand H2L = 1-phenyl-3-[(2-hydroxyphenyl)imino]-1-butanone. The structure of 1 was determined by single-crystal X-ray diffraction. It exhibits a discrete [Ni4O4] cluster. Magnetic studies indicate that ferromagnetic interactions exist within compound 1. Furthermore, thermogravimetric analysis and PXRD patterns in various solvents reveal thermal and solvent stability of compound 1.

An ether bridged tetracarboxylic acid ligand, 5-(3′,4′-Dicarboxylphenoxy)-isophthalic acid (H4L) was used to construct two Co(II) coordination polymers in presence of different nitrogen donor ligands such as 4,4′-bipyridine (4,4′-bpy) and 4,4′-bis(pyrid-4-yl)biphenyl (bpbp). The products formed under hydrothermal conditions are formulated as [Co2L(4,4′-bpy)2(H2O)3]n (1) and {[Co(bpbp)2(H2L)]·H2O}n (2). The compounds were characterized by single-crystal X-ray diffraction, IR spectroscopy, elemental analysis, and powder X-ray diffraction (PXRD) measurement. Compound 1 shows an intriguing (3,4,5)-connected 3D framework with a point symbol of (42 · 62 · 82)(42 · 65 · 83)(62 · 8). Compound 2 is an unusual 3D supramolecular framework generated by the one-dimensional [Co(bpbp)(H2L)]n polymer chain. The magnetic properties of compounds 1 and 2 were examined, indicating antiferromagnetic interactions between the cobalt(II) ions in the temperature range of 2–300 K.

A new Co(II) coordination polymer, namely [Co6(btc)4(dtb)2(H2O)3]n (1) (H3btc = 1,3,5-benzenetricarboxylic acid, dtb = 1,3-di-(1,2,4-triazole-4-yl)benzene), has been synthesized by combining the mixed ligands of H3btc and dtb with Co(Ac)2·4H2O under solvothermal conditions. Single-crystal X-ray diffraction analysis reveals that 1 feature a 3D open framework with intersecting channels based on Co-btc3 − layers and btc3 − and dtb pillars. The magnetic property of the complex has also been investigated at room temperature.

A new Cu(II) metal-organic framework {[Cu1.5(1,3-bdc)(dtb)(OH)(H2O)](H2O)}n (1) (1,3-H2bdc = 1,3-benzenedicarboxylic acid, dtb = 1,3-di-(1,2,4-triazole-4-yl)benzene), has been synthesized and characterized by single-crystal X-ray diffraction, powder X-ray diffraction, elemental analysis, and IR spectra. Compound 1 features a 3-D open framework constructed by infinite 1D rod-shaped [Cu3(OH)2]n chains as secondary building units. The magnetic property of the complex has also been investigated.

Dissolved iron exerts significant effects on mineral leaching, impurity removal, and solution purification in the zinc hydrometallurgy process. To date, iron oxidation and migration behaviors are yet to be fully understood and further research on effective regulation mechanisms of iron is required. In this paper, zinc sulfide concentrate was used as the research object. The behaviors of both Zn and Fe during pressure leaching were investigated for varying temperature, acid addition, and leaching time. At temperature of 100~160 &deg, C, H2SO4/Zn ratio of 0.9:1&ndash, 1.25:1, and leaching time of 0.5&ndash, 2.5 h, the zinc extraction increased with temperature, acidity and leaching time. The iron extraction, however, varied differently with increasing temperature, acidity and leaching time: (A) it increased with temperature to 150 &deg, C and then decreased at higher temperature, and (B) displayed an initial increase followed by a decrease with respect to the leaching time. Based on the characteristics of the residue phase, chemical phase analysis was used to analyze the residue in detail. The extent of dissolution of iron-containing minerals and the extent of precipitation of ferric ions during the leaching process were quantitatively calculated.

Somatostatin and its analogues, which function by binding to somatostatin receptors (SSTRs) 1–5, play a protective role in liver cirrhosis. Hepatic SSTR-2 expression is up-regulated in subjects with liver cirrhosis. However, little is known about the mechanisms underlying this process. In the present study, we observed the up-regulation of hepatic SSTR-2 expression in thioacetamide (TAA)-induced cirrhotic rats and further showed that cyclooxygenase-2 (COX-2) might play a role in this process via the protein kinase C (PKC)–cAMP response element binding protein (CREB) signaling pathway. In vivo, the up-regulated SSTR-2 in liver cirrhosis was inhibited by the addition of a selective COX-2 inhibitor, such as celecoxib. In vitro, the up-regulation of COX-2 by either transfection with COX-2 plasmids or treatment with TAA increased levels of SSTR-2 and phosphorylated CREB (p-CREB) in the human hepatocyte cell line L02. Furthermore, the increase in SSTR-2 expression was inhibited by the addition of celecoxib and a PKC inhibitor. Moreover, for comparable DNA methylation levels in the region upstream of the hepatic SSTR-2 gene in normal and cirrhotic livers, DNA methylation may not contribute to the up-regulation of SSTR-2 expression in cirrhotic livers. In conclusion, the up-regulation of hepatic SSTR-2 might be induced by COX-2 via the PKC-CREB signaling pathway but is probably not induced by DNA methylation.

Hydrothermal reactions of biphenyl-2,3,3′,5′-tetracarboxylic acid (H4bptc) with manganese salt in the presence of 1,4-bis(2-pyridylmethyl)piperazine (bpmp) afforded one novel coordination polymer, namely, [Mn2(bptc)(bpmp)0.5]n (1). Its structure was established by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, IR spectra and TG analysis. Complex 1 contains {Mn4} cluster, exhibiting an unusual mode of two-fold interpenetrating three-dimensional (3D) framework with a (3, 8)-connected (84.102) (4.7.84.102.11.15) topology. In addition, magnetic susceptibility measurements indicate that complex 1 show weak antiferromagnetic interactions between the adjacent manganese ions.

Background: The use of different methods for the processing of ginseng can result in alterations in its medicinal properties and efficacy. White ginseng (WG), frozen ginseng (FG), and red ginseng (RG) are produced using different methods. WG, FG, and RG possess different pharmacological properties. Methods: WG, FG, and RG extracts and pure ginsenosides were administered to rats to study the pharmacokinetics and tissue distribution characteristics of the following ginsenosides—Rg1, Re, Rb1, and Rd. The concentrations of the ginsenosides in the plasma and tissues were determined using UPLC-MS/MS. Results: The rate and extent of absorption of Rg1, Re, Rb1, and Rd appeared to be affected by the different methods used in processing the ginseng samples. The areas under the plasma drug concentration-time curves (AUCs) of Rg1, Re, Rb1, and Rd were significantly higher than those of the pure ginsenosides. In addition, the AUCs of Rg1, Re, Rb1, and Rd were different for WG, FG, and RG. The amounts of Rg1, Re, Rd, and Rb1 were significantly (p

Two new pressure-dependent pseudo-polymorphism complexes, a 2D polymeric {[Cu2(TBA)]·2H2O}n (1) and a dinuclear [Cu2(TBA)(H2O)2]·2H2O (2), were successfully obtained and demonstrated to possess weak antiferromagnetic properties. The synthesis has been achieved through a novel one-pot reaction where four DMBA (DMBA = 1,3-dimethyl-barbitiric acid) molecules tetramerized in situ with EtOH to give (TBA)4– (H4TBA = 1,1′,2,2′-tetra-barbiturate-ethene) ligand. This unprecedented tetramerization involves one-pot formation of one new C═C bond and four new C–C bonds. It was shown that the formation of 1 strictly relied on the use of Cu(II) ion and EtOH and that reactions of oxidation, Knoevenagel condensation, and Michael addition probably induce the tetramerization.

A novel coordination polymer {[Mn2(L)4/3(H2O)3]⋅2H2O}n (1), was synthesized by the hydrothermal reaction of 4,4′-[(5-carboxy-1,3-phenylene)bis(oxy)]dibenzoic acid (H3L) with manganese(II) chloride tetrahydrate (MnCl2⋅4H2O) in an aqueous solution. The single X-ray diffraction indicated that the coordination polymer 1 had a three-dimensional (3D) framework. A trinuclear Mn unit is utilized as a building block connected via oxygen atoms of carboxylate group to form a two-dimensional layer structure. The interlayers connected by the ligands result in a 3D architecture. The coordination polymer 1 was characterized by the infrared spectroscopy, elemental analysis and powder XRD. According to magnetic susceptibility measurements the coordination polymer 1 can be characterized with the antiferromagnetic coupling interaction of J = −3.21 cm−1. Furthermore, the thermogravimetric analysis revealed good thermal stability for the coordination polymer 1.

Extracellular ATP (eATP) plays essential roles in plant growth, development, and stress tolerance. Extracellular ATP-regulated stomatal movement of Arabidopsis thaliana has been reported. Here, ATP was found to promote stomatal opening of Vicia faba in a dose-dependent manner. Three weakly hydrolysable ATP analogs (adenosine 5'-O-(3-thio) triphosphate (ATPγS), 3'-O-(4-benzoyl) benzoyl adenosine 5'-triphosphate (Bz-ATP) and 2-methylthio-adenosine 5'-triphosphate (2meATP)) showed similar effects, indicating that ATP acts as a signal molecule rather than an energy charger. ADP promoted stomatal opening, while AMP and adenosine did not affect stomatal movement. An ATP-promoted stomatal opening was blocked by the NADPH oxidase inhibitor diphenylene iodonium (DPI), the reductant dithiothreitol (DTT) or the Ca(2+) channel blockers GdCl3 and LaCl3. A hyperpolarization-activated Ca(2+) channel was detected in plasma membrane of guard cell protoplast. Extracellular ATP and weakly hydrolyzable ATP analogs activated this Ca(2+) channel significantly. Extracellular ATP-promoted Ca(2+) channel activation was markedly inhibited by DPI or DTT. These results indicated that eATP may promote stomatal opening via reactive oxygen species that regulate guard cell plasma membrane Ca(2+) channels.

The metal-organic framework {[Zn2(CAM)(μ2-OH)(bpp)]·2H2O}n (1) [H3CAM = 4-hydroxypyridine-2,6-dicarboxylic acid, bpp = 1,3-bis(4-pyridyl)propane], was hydrothermally synthesized and characterized by elemental analyses, infrared spectroscopy, and single-crystal X-ray diffraction. Compound 1 presents a three dimensional self-penetrating 8-connected framework with the Schlafli symbol 420.53.65. In addition, the fluorescent properties and thermal stability of 1 were discussed as well.

N&epsilon, (Carboxymethyl) lysine (CML) and N&epsilon, (carboxyethyl) advanced glycation end-products (AGEs) and are frequently used as markers of AGE formation. AGEs, such as CML and CEL, have harmful effects in the human body and have been closely linked to many diseases such as diabetes and uremia. However, details on the contents of CML and CEL after applying different antler velvet processing methods are lacking. In this research, a robust lysine (CEL) are two typical UPLC-MS/MS method has been developed for the simultaneous determination of CML and CEL in various sections of antler velvet processed with different methods. In addition, factors affecting the CML and CEL contents are discussed. The CML contents of antler velvet after freeze-drying, boiling, processing without blood, and processing with blood were 74.55&ndash, 458.59, 119.44&ndash, 570.69, 75.36&ndash, 234.92, and 117.11&ndash, 456.01 &mu, g/g protein, respectively, the CEL contents were 0.74&ndash, 12.66, 11.33&ndash, 35.93, 0.00&ndash, 6.75, and 0.00&ndash, 23.41 &mu, g/g protein, respectively. The different contents of CML and CEL in the different samples of antler velvet result from the different interactions of the protein and lysine at different temperatures. These data can be used to estimate the potential consumer intake of CML and CEL from antler velvet and for guiding producers on how to reduce the production of CML and CEL.

Two new Co(II) and Mn(II) coordination polymers [Co(atpa)(bpp)]n (1), and [Mn(3-aba)2(4,4′-bpy)]n·n(4,4′-bpy) (2) (H2atpa = 2-aminoterephthalic acid and 3-aba−= 3-aminobenzoic acid anion), have been synthesized through solvothermal reactions using 2-aminoterephthalic acid, cobalt/manganese salts, and different dipyridyl-type coligands 1,3-di(4-pyridyl)propane (bpp) and 4,4’-bipyridyl as starting materials. The complexes 1 and 2 were characterized by elemental analysis, IR spectra, and X-ray single-crystal diffraction. Complex 1 displays a 2-fold parallel interpenetrating array of undulating (4, 4) coordination layers. Complex 2 features a 1D chain and further forms a 3D supramolecular pattern by H-bondings.

Two novel complexes [Zn(hfac)2 (NIT-1’-MeBzIm) ] 1 and [Cu(hfac)2(NIT-1’-MeBzIm)] 2 (hfac = hexafluoroacetylacetonate; NIT-1’-MeBzIm = 2-{2’-[(l’-methyl)benzimidazolyl]}-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) have been prepared and structurally characterized by X-ray diffraction methods. Both complexes crystallize in orthorhombic. Crystal data for 1: C25H21F12N4O6Zn, Mr = 766.83, space group P2(1)/c, a = 12.1812(13), b = 16.8770(18), c = 15.5230(16) A, β = 98.009(2)°, V = 3160.1(6) A3, Dc = 1.612 g/cm3, μ(MoKα) = 0.893 mm−1, F(000) = 1540, R = 0.0925, and wR = 0.2652 for 2804 observed reflections with I > 2σ(I).Crystal data for 2: C25H21F12N4O6Cu, Mr = 765.00, space group P2(1)/n, a = 17.709(4), b = 9.325(2), c = 19.414(4) A, V = 3086.5(12) A3, Dc = 1.646 g/cm3, μ (MoKα) = 0.826 mm−1, F(000) = 1536, R = 0.0753, and wR = 0.1992 for 3435 observed reflections with I > 2σ(I). Both Zinc(II) ion and Copper(II) ion are six-coordinated with a geometry of distorted octahedral.

A new manganese(II) coordination polymer, [Mn3(atpt)3(2, 2′-bpy)2]n (1) (H2atpt = 2-aminoterephthalic acid; 2, 2′-bpy = 2, 2′-bipyridine), was synthesized by hydrothermal reaction of Mn(OAc)2, H2atpt, and 2, 2′-bpy. It was structurally characterized by element analysis, IR spectroscopy, powder XRD, and magnetic measurements. X-ray single-crystal analysis was carried out for 1, which crystallizes in the orthorhombic system, space group Pbca. The single X-ray diffraction studies reveal that 1 consists of infinite layers of alternating trinuclear manganese subunits and H2atpt ligands. There are two types of different coordination modes of H2atpt in 1. Magnetic susceptibility data for 1 were measured in the range 3–300 K. There are antiferromagnetic interactions between manganese ions of 1.

Two new complexes, [Cd(hpdaH)(H2O)1.5]2n.n(bpp) (1) and [Ni(hpdaH)(2′2-bipy)H2O]·(H2O)2(2) (hpdaH3 = 4-hydroxy- pyridine-2,6-dicarboxylic acid, bpp = 1,3-bi(4-pyridyl)propane, 2,2′-bpy = 2,2′-bipyridine), were synthesized under hydrothermal conditions at 140°C and were characterized by elemental analysis, FT-IR spectroscopy, and single-crystal X-ray diffraction. Both crystallize in monoclinic system, space group Pc with a = 12.4435(15), b = 9.0015(11), c = 13.7170(17) A, β = 99.9970(10)°, Z = 4 for 1 and space group P2(1)/n with a = 17.0228(14), b = 11.1624(9), c = 19.9271(16) A, β = 93.9050(10)°, Z = 8 for 2. X-ray analysis demonstrates that complex 1 has a novel one-dimensional coordination polymeric structure linked by two kinds of bridging groups in an alternating manner. Complex 2 contains a mononuclear Ni(II) complex and two solvate water molecules. Furthermore, two complexes extend to supramolecular architectures via rich hydrogen bonding interactions.

Two new cadmium(II) complexes [Cd1.5(L)Cl2(H2O)]2 n (1) and [CdL2] n (2) with a multidentate N-donor building block 3-(pyridin-4-yl)-5-(pyrazin-2-yl)-1H-1,2,4-triazole (HL) have been prepared and characterized by elemental analysis, infra-red spectra, powder X-ray diffraction (XRD), and single-crystal XRD. 1 is a 2-D layered coordination polymer constructed from linkage of [Cd3(μ-Cl)4] trinuclear units with HL spacers, while 2 shows a 2-D layer structure. 3-D supramolecular architectures are further assembled in 1 and 2 via hydrogen-bonding contacts. Both 1 and 2 are thermally stable to 450 °C, and 2 showed strong fluorescent emission bands.

A unique lanthanide coordination polymer, formulated as {[Pr 3 (Heimda) 2 ( μ 2 -HCOO) ( μ 2 -C 2 O 4 ) 2 ·5H 2 O]} n (H 3 eimda = 2-ethyl-1H‐imidazole‐4,5‐dicarboxylic acid, H 2 C 2 O 4 = oxalic acid) ( 1 ), has been hydrothermally synthesized by using lanthanide(III) nitrate, H 3 eimda acid at the presence of two kinds of carboxylate as coligands. The polymer was characterized by elements analysis, IR spectroscopy, thermogravimetry, variable-temperature magnetic susceptibility and single‐crystal X-ray diffraction study. Polymer 1 possesses three-dimensional (3-D) framework with Pcu topology, containing the original 1D zig-zag chain composed of [Pr-HCOO] 2+ moieties. Variable temperature magnetic susceptibility measurements indicate that depopulation of the Stark levels or possible antiferromagnetic interactions within polymer 1 leads to the continuous decrease of χ M T when the samples are cooled from 300 to 2 K, and the photoluminescence properties of polymer 1 were also investigated.

Two complexes, namely [Mn3(hpda)2(H2O)8]n (1) and [Co3(hpdaH)3(H2O)7]·(4, 4′py)·(H2O)3 (2) (hpdaH3 = 4-hydroxypyridine-2, 6-dicarboxylic acid) were synthesized under hydrothermal conditions and were characterized by elemental analysis, IR spectrocopy, and X-ray diffraction. Complex 1 forms a 1D linear chain, which is extended by hydrogen bonds resulting in a 3D network. Complex 2 consists of a trinuclear cobalt(II) unit, which is further linked by hydrogen bonds to form a 3D supramolecular network. Magnetic measurements show that there is a weak antiferromagnetic interaction between the adjacent MnII ions in 1.

The title complex {[Yb(1,4-BDC)1.5(H2O)4]·H2O}n (1) (1,4-BDC = 1,4-benzenedicarboxylate) has been hydrothermally synthesized and structurally characterized by the single crystal X-ray diffraction. Crystals of compound 1 belongs to the triclinic crystal system, space group P-1; a = 7.549(3) A, b = 10.072(4) A, c = 10.470(4) A, α = 87.810(4)°, β = 82.531(4)°, γ = 86.306(4)°, V = 787.3(5) A3, Z = 2. The Yb(III) atoms are linked by the deprotonated 1,4-BDC ligands in two kinds of bridging modes. Four Yb(III) atoms at each corner (nodes) and four 1,4-BDC ligands at each edge (spacers) form a edge–sharing 36-membered rings. The rhombohedral Yb4(1,4-BDC)4 arranged in an alternating fashion to construct a 1D ladder-like chain along the c axis. Two neighboring chains are linked to each other in a parallel fashion to construct 3D supramolecular structure by O–H···O hydrogen bonds and π–π stacking interactions. In addition, the properties of thermogravimetric analysis and magnetic behaviors of the complex have been also discussed. 1,4-Benzenedicarboxylate-bridged Yb(III) coordination polymer {[Yb(1,4-BDC)1.5(H2O)4]·H2O}n was hydrothermally synthesized and characterized structurally. Yb(III) center is linked to three Yb(III) ions via the three 1,4-BDC ligands to form a edge–sharing 36-membered rings. The rhombohedral Yb4(1,4-BDC)4 arranged in an alternating fashion construct a 1D ladder-like chain along the c axis. Magnetic behaviors have been also discussed.

Two new 3d-4f complexes, [LnCo(3,5-pdc)2(3,5-Hpdc) (H2O)7]·H2O (Ln = Gd 2, La 3; 3,5-pdcH2 = pyridine-3,5-dicarboxylic acid), have been synthesized by the self-assembly of Ln(III) oxides, 3,5-pdcH2 and the template molecule [Co(3,5-pdc)(H2O)5]·H2O (1) under hydrothermal conditions. Heterometallic complexes 2 and 3 are isostructural with supracyclic units containing four Ln(III) ions and two Co(II) ions, in which Co(II) and Ln(III) are linked by the deprotonated 3,5-pdcH2 ligands in three kinds of bridging modes. The weak antiferromagnetic coupling of complex 2 and 3 imply that the large 3,5-pdc bridges with the greater separation ( > 7 A) cannot lead to long range magnetic ordering, the strength of dn-fn exchange coupling increasing with decreases the size of the lanthanide ion.

A new Schiff base ligand C19H13NO5(H2L) was synthesized using 2-aminoterephthalic acid and 2-hydroxy-1-naphthaldehyde. A complex of this ligand [Cu(C19H11NO5)(C2H6O)] n was synthesized and characterized by IR, UV, fluorescence spectroscopy and X-ray diffraction single-crystal analysis. The crystal crystallizes in the monoclinic system, space group Pbca with a = 8.7745(18), b = 18.613(4), c = 24.644(5) A, V = 4024.9(14) A3, Z = 8, F(000) = 1816, S = 1.009, ρ calcd = 1.462 g cm−3, μ = 1.122 mm−1, the final R = 0.0477 and wR = 0.1594 for 4609 observed reflections (I > 2σ(I)). The Cu(II) is five-coordinated by one N atom and two O atoms from the Schiff base ligand and two carboxylate O atoms from another two ligands to form a distorted square-pyramidal geometry. Each ligand serves as a bridging ligand to link Cu2+ ions, leading to a two-dimensional coordination polymer. The fluorescence properties of the ligand and complex were also studied. The ligand shows strong fluorescence, and the fluorescence intensity is weakened after the Cu(II) complex formed.

A new chelating radical ligand, IMMeBzIm (IMMeBzIm = 2-{2′-[(l′-methyl)benzimidazolyl]}-4,4,5,5-tetramethylimidazoline-1-oxyl) and its copper(II) complex [Cu(IMMeBzIm)2(ClO4)]·(ClO4) have been prepared and characterized by IR, magnetic and single-crystal X-ray analysis. In the crystal structures, both free IMMeBzIm and the complex crystallize in monoclinic space groups P2(1)/c and C2/c, respectively. The structure of IMMeBzIm consists of mononuclear molecules. In the complex, the coordination geometry around copper is a distorted square pyramid, and the apical position is occupied by one oxygen atom of ClO4 − anion. A 1-D polymer is formed through intermolecular H-bond interactions. The variable-temperature magnetic susceptibility of the free IMMeBzIm suggests weak antiferromagnetic coupling with J = −1.12 cm−1 where the spin Hamitonian is defined as Ĥ = −2 JŜ 1 Ŝ 2 between radical and radical.

A new taxoid metabolite with an unusual double bond between C-13 and C-14 was isolated from the methanol extract of the hard wood of Taxus cuspidata. The structure was established as 2α,5α,7β ,9α,10β ,13β -hexaacetoxy-11β -hydroxyl-19β -benzoxytaxa-4(20),13-dien- 12,16-epoxide (1), named 5,13-diacetyltaxinine M-13-enol, on the basis of spectral analysis including 1H NMR, 13C NMR, HMQC, HMBC, NOESY and confirmed by HR-FAB-MS.

A new chelating radical ligand NIT-1′-MeBzIm (1) (NIT-1′-MeBzIm = 2-{2′-[(l’-methyl)benzimidazolyl]}-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) and three corresponding complexes [M(NIT-1′-MeBzIm)2(NO3)(CH3OH)]·(NO3)(CH3OH) (M = Ni (2), Co (3)), [Zn(NIT-1′-MeBzIm)2(CH3OH)2]·(ClO4)2(H2O)2(CH3OH) (4) have been prepared and structurally characterized by X-ray diffraction method and variable-temperature magnetic susceptibility measurements. In the crystal structures, radical 1, complexes 3 and 4 crystallize isomorphously in monoclinic, with the space groups are P2(1)/n, P2(1)/c, and P2(1), respectively. Complex 2 crystallizes in orthorhombic space group Pna2(1). The metal ions of the three complexes embed in distorted octahedron geometry centers and coordinated by two NIT-1′-MeBzIm radicals from the equatorial positions to form trans configuration, the axial positions are occupied by one methanol molecule and one nitrate anion for 2 and 3, but by two methanol molecules for 4. Magnetic measurement demonstrates that the intramolecular exchange couplings in 2 and 3 are antiferromagnetic with J = −41.25 and −38.1 cm−1, where the spin Hamiltonian is defined as Ĥ = −2J(Ŝrad1 ŜM + ŜM Ŝrad2) based on the molecular structure of radical-metal-radical, while that in 4 is weak ferromagnetic with J = 1.65 cm−1 where the spin Hamiltonian is defined as Ĥ = −2JŜ1Ŝ2 within the complexes. Intermolecular exchange couplings in 1 is also weak ferromagnetic with J = 1.32 cm−1 where the spin Hamiltonian is defined as Ĥ = −2JŜ1Ŝ2 between radical and radical. Compounds 2–4 exhibit intermolecular antiferromagnetic interaction with the zJ′ = −0.52 cm−1, θ = −0.75 K and zJ′ = −0.49 cm−1 for compounds 2, 3 and 4, respectively, which should ascribe to the weak interactions. The crystal structures for 1–4 have intermolecular hydrogen bonding interactions (and π–π piling interactions for 1 and 3) which form the single crystals into 1-D, 2-D, 3-D structures and seems to play an important role in molecular packing and in magnetic coupling.

A new ternary mixed-ligand complex [Cu2(sal-glu)2(bipy)(H2O)2] · (H2O) (bipy = 4,4′-bipyridine and sal-glu = salicylaldehyde l-glutamic Schiff base) has been synthesized and characterized by X-ray diffraction. It crystallizes in the triclinic system, space group P-1 with a = 9.6199(13) A, b = 9.9111(13) A, c = 9.9167(13) A. The amino acid Schiff base coordinates to the Cu(II) ion in a tridentate mode including phenol-hydroxyl oxygen, carboxyl oxygen and amide nitrogen atom, while the bipy coordinates in bidentate bridging mode linking two Cu(II) ions. The [Cu2(sal-glu)2(bipy)(H2O)2] units are linked into 1-D chain structure and the bipy molecules are interspersed into parallel sheets via intermolecular hydrogen bonds. The carboxyl oxygen atoms, phenolic oxygen atoms and water oxygen atoms are involved in the extensive intermolecular hydrogen bond network between the water molecules and phenol-hydroxyl oxygen atoms from salicylaldehyde derived ligand. A new ternary mixed-ligand complex [Cu2(sal-glu)2(bipy)(H2O)2]·(H2O) (bipy = 4, 4′-bipyridine and sal-glu = salicylaldehyde l-glutamic Schiff base) crystallizes in the triclinic system, space group P-1 with a = 9.6199(13) A, b = 9.9111(13) A, c = 9.9167(13) A. The amino acid Schiff base coordinates to the Cu(II) ion in a tridentate mode including phenol-hydroxyl oxygen, carboxyl oxygen and amide nitrogen atom, while the bipy coordinates in bidentate bridging mode linking two Cu(II) ions. The [Cu2(sal-glu)2(bipy)(H2O)2] units are linked into 1-D chain structure and the bipy molecules are interspersed into parallel sheets via intermolecular hydrogen bonds. The carboxyl oxygen atoms, phenolic oxygen atoms and water oxygen atoms are involved in the extensive intermolecular hydrogen bond network between the water molecules and phenol-hydroxyl oxygen atoms from salicylaldehyde derived ligand.

Two complexes of formulas [Ni(IM-MeImz)2(SCN)2]·CH3CH2OH (1) and [Mn(IM-MeImz)2(SCN)2]·3H2O (2), where IM-MeImz = 2-(5-Methylimidazol-4-yl)-4,4,5,5-tetramethyl-2-imidazoline-1-oxyl, have been synthesized and characterized by single-crystal X-ray diffraction. The X-ray analysis demonstrates that IM-MeImz ligand is coordinated to metal ion with the κ2 N(MeImz), O(IM) mode to avoid steric hindrance with the methyl group in complex. In the solid state, the complexes 1 and 2 are linked by intermolecular hydrogen bonds, leading to two-dimensional structure. The variable-temperature magnetic susceptibility of both compounds suggests that the metal ions and radicals are ferromagnetically coupled with J = 2.78 and 1.11 cm−1 for complexes 1 and 2, respectively.

Two new copper(II) compounds with imino nitroxide radicals [Cu(IM-MeImz)2 · (SCN)] 0.5[Cu(SCN)4] (1) and [Cu(IM-MeImz)2 · (SCN)]ClO4 · H2O (2) (IM-meImz = 2-(5-methylimidazol-4-yl)-4,4,5,5-tetramethyl-2-imidazoline-1-oxyl) have been synthesized and characterized structurally and magnetically. X-ray analysis demonstrates that complex 1 contains CuII ions in both square-pyramidal and square planar coordination. There are complete charge separation into [Cu(IM-MeImz)2(SCN)]+ cations and 0.5[Cu(SCN)4]− anions, in a 2:1 ratio. The complex 1 was connected as a one-dimensional polymer by intermolecular interactions. In complex 2, the coordination around the copper atom is distorted square pyramidal and the apical position is occupied by one nitrogen atom of SCN− anion. The 2-D network structure was formed and arranged through intermolecular H-bonds interactions. The complex 1 exhibits intramolecular weak ferromagnetic coupling between CuII ion and the radicals.

The lead(II) complex with nitronyl nitroxide, [Pb(NIT2Py)2(NO3)2] [NIT2Py = 2-(2′-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide], has been prepared and characterized by magnetic and single-crystal X-ray diffraction studies. In the complex, the lead(II) ion is coordinated with two bidentate nitronyl nitroxide and two nitrate anions. The lead(II) ion shows seven-coordinate geometry. Magnetic susceptibility data for the title complex has been measured in the range 5–300 K. There are antiferromagnetic interaction between the coordinated nitronyl nitroxides (J = −19.35 cm−1) and intermolecular ferromagnetic interactions. Thus, we observe the sixth periodic IVA group metal element Pb(II) ion providing an effective pathway for the magnetic exchange interaction between nitronyl nitroxide radicals.

A new nitronyl nitroxide NIT2-bithph ( 1 ) and its manganese(II) compound [Mn(hfac) 2 (IMHBithph)] 2 ·(NIT2-bithph)(C 6 H 14 ) ( 2 ) (hfac = hexafluoroacetylacetonate; NIT2-bithph = 4,4,5,5-tetramethyl-2-(bithiophenal-2-yl)imidazoline-1-oxyl-3-oxide; IMHBithph = 1-hydroxy-2-bithiophenal-4,4,5,5-tetramethyl-4,5-dihydro- 1H-imidazole) have been synthesized and structurally characterized by X-ray diffraction methods. The units of compound 1 were connected as one-dimensional chain by the intermolecular hydrogen bonds which afford an intermolecular antiferromagnetic interaction between nitronyl nitroxide radicals within the chain ( J = −1.89 cm −1 ). Compound 2 resulting from the reaction of Mn(hfac) 2 ·2H 2 O and NIT2-bithph is dinuclear and includes the reduced amidino-oxide form of NIT2-bithph, it is made up of three parts: a [Mn(hfac) 2 (IMHBithph)] 2 dimer unit, an uncoordinated NIT2-bithph radical and a noncoordinated solvent molecule of hexane, the molecule of radical is hydrogen bonded to its reduced form. Two reduced IMHBithph ligands bridge the two manganese(II) ions through their amidino-oxide oxygen atoms resulting in a small intramolecular antiferromagnetic interaction between the manganese ions ( J = −1.55 cm −1 ).

A novel complex Zn(NIT2-py)3(ClO4)2(NIT2-py = 2-(2′-pyridyl)-4,4,5,5-tetramethyl-2-imidazoline-1-oxyl-3-oxide) (1) has been synthesized and characterized structurally and magnetically. The metal coordination sphere is fully occupied by three chelating nitroxide ligands, showing a distorted octahedral geometry. Temperature dependence of susceptibility measurements shows a weak ferromagnetic coupling between NIT2-py radicals with J = 2.13 cm−1. The field dependence of the magnetization further confirms that the ground state of the compound S = 3/2 results from ferromagnetic interactions within the complex 1.

A novel nickel(II) complex, Ni(NIT2-thz)2(NO3)2 (NIT2-thz=2-(2′-thiazole)-4,4,5,5-tetrmethylimidazoline-1-oxyl-3oxide) was synthesized, the crystal structure and magnetic properties were mainly discussed in the present work. In the title compound, each nickel(II) ion is chelated by two NIT2-thz ligands through oxygen atoms of nitroxide group and nitrogen atoms of thiazole group forming two six-membered rings at equatorial positions, together with the coordination of two oxygen atoms from two nitrate anions at axial positions, which formed a elongated octahedral geometry. By the intermolecular interactions, the molecules were connected as a 2D network. Magnetic measurements show that there are moderate ferromagnetic interactions between the Ni(II) ions and the radicals (J=43.47 cm−1).

The reaction of N-benzesulfonyl- l -glutamic acid (Bs-glu) with Zn(CH3COO)2 · 2H2O or Co(CH3COO)2 · 4H2O in the presence of imidazole (Im) produced two novel complexes [Zn(Im)2(Bs-glu)]n (1) and [Co(Im)2(Bs-glu)]n (2). Both of the complexes exhibit similar one-dimensional structural motif and coordination environment. Bs-glu adopts the bis-monodentated coordination mode linking two adjacent metal ions. The complex 1 shows intense photoluminescence in the solid state. Magnetic measurements for 2 show that the exchange interaction of the two Co(II) ions is antiferromagnetic.

First N-benzenesulfonyl-L-glutamic acid-bridged manganese(II) coordination polymer [Mn(bipy)(bs-glu)]n (bs-glu = N-benzenesulfonyl-L-glutamic acid dianion, bipy = 2, 2′-bipyridine) has been synthesized and characterized structurally and magnetically. It crystallizes in the orthorhombic space group P212121. The γ-carboxyl group coordinates to the MnII atom in a chelating mode, while the α-carboxyl group coordinates in a bidentate-bridging mode. The complex displays a one-dimensional double-chain polymer. Magnetic measurements show that there are weak antiferromagnetic interactions between the adjacent MnII ions in the compound.

The reaction of Pb(CH3COO)2·3H2O with N-benzesulfonyl-L-glutamic acid in the presence of 2, 2′-bipyridine (bipy) or 1,10-phenanthroline (phen) produced two novel complexes [Pb2(Bs-glu)2(bipy)2] (1) and [Pb2(Bs-glu)2(phen)2] (2) (Bs-glu = N-benzesulfonyl-L-glutamic acid dianion). In 1 chains bearing alternative 16-membered rings and Pb2O3 nodes are constructed from the interactions of PbII ions with the carboxylates of Bs-glu ligands. To the best of our knowledge, this is the first lead(II) complex of carboxylates with the formation of chains of Pb2O3. In 2 the 16-membered ring units are connected by centrosymmetric Pb2O2 nodes to form chains. Complexes 1 and 2 construct the 3-D supramolecular architectures through versatile hydrogen bonds and π-π stacking interactions.