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With reference to Sr2Be2B2O7, two new short-wave ultraviolet beryllium-free Sr2Be2B2O7-type zincoborates, Na3AEZn2B3O9 (AE = Mg and Ca), were successfully designed by a cosubstitution strategy and synthesized by a molten-salt method.

A praseodymium complex, [Pr(IA)2(H2O)4]nnCl (1) (HIA = isonicotinic acid), has been prepared via a solvothermal reaction and characterized by single crystal X-ray diffraction. The praseodymium ion ...

A novel two-dimensional (2-D) bimetallic erbium-mercury compound {[Er(IA)(HIA)2(H2O)2]2(Hg3Br8)} n (nHgBr2)·2nNO3 (denoted as 1; HIA = isonicotinic acid; IA = isonicotinato anion) was prepared and ...

A new compound [Gd(H2O)4(HIA)2(NO3)](2NO3) (1; HIA is isonicotinic acid) is reported. The Gd3+ cation is coordinated by eight oxygen atoms and exhibit a square antiprismatic GdO8 geometry. A three-...

A novel compound {[Er(IA)3(H3O)2]3n}(nHgCl5)(0.5nHg2Cl6)(2nCl)·16nH2O (1; HIA = isonicotinic acid) was prepared. The erbium(III) cations are coordinated by eight oxygen atoms and display a square a...

Under hydrothermal conditions, a new zinc compound, [Zn(2,2’-bpy)3]2S·16H2O·2OH (1) (2,2’-bpy = 2,2’-bipyridine) was synthesized and structurally characterized by using a single-crystal X-ray diffr...

A novel cadmium bipyridine complex, [Cd(bipy)3(H2O)2]n·2n(Et-Bipy)·n(bipy)·2nCl (1) (bipy = 4,4’-bipyridine, Et = ethyl group), has been prepared via a solvothermal reaction and structurally charac...

Porphyrins and metalloporphyrins can generally show attractive structural motifs and interesting properties. A new copper porphyrin, namely poly[[μ-chlorido-[μ5-5,10,15,20-tetrakis(pyridin-4-yl)-21H,23H-porphine]tricopper(I)] [aquadichloridocopper(II)]], {[Cu3(C40H24N8)Cl][CuCl2(H2O)]} n (1), was synthesized by the self-assembly of copper chloride with 5,10,15,20-tetrakis(pyridin-4-yl)-21H,23H-porphine under solvothermal conditions. The structure of this copper porphyrin was characterized by single-crystal X-ray crystallography and elemental analysis. The porphyrin macrocycle shows a distorted saddle geometry, with the four pyrrole rings slightly distorted in an alternating mode either upwards or downwards. The copper ions show three-coordinated triangular and four-coordinated square-planar geometries. Every copper–porphyrin unit connects to 12 others via four μ4-bridging Cu2Cl moieties to complete the three-dimensional framework of compound 1, with isolated CuCl2(H2O) units located in the voids. This copper porphyrin displays a red photoluminescence. Electrochemical measurements showed that compound 1 has two redox waves (E 1/2 = −160 and 91 mV).

By means of hydrothermal reactions, a novel terbium–mercury compound, {[Tb(IA)3(H3O)2]2n[2n(HgCl4)][n(HgCl5)]}·3nH3O·nH2O (1) (HIA = isonicotinc acid) was prepared and structurally characterized by...

One cadmium-bipyridinium compound, (CdCl4)(CH3-4,4′-Hbipy-CH2CH3)2 (1) with the CH3-4,4′-Hbipy-CH2CH3 generated in situ, has been synthesized from a solvothermal reaction and structurally character...

Two new lanthanide-mercury complexes [Eu(HIA)2(H2O)2Hg2Cl5(IA)]nn(HgCl2)·2nH2O·nCl (1) and [Tb(HIA)2(H2O)2Hg2Cl5(IA)]nn(HgCl2)·2nH2O·nCl (2) (HIA = isonicotinic acid) have been prepared through hydrothermal reactions and structurally determined by single crystal X-ray diffraction. 1 and 2 are isostructural and have a two-dimensional (2-D) layer structure. Solid-state UV/Vis diffuse reflectance spectroscopy shows that there is a wide optical band gap of 3.42 and 3.44 eV for 1 and 2. Photoluminescence measurement of solid-state samples revealed that 1 and 2 exhibit red or green emission, respectively. The photoluminescence bands originate from the characteristic 4f-electron intrashell transitions of 5D1 → 7F1 and 5D0 → 7FJ (J = 1, 2 and 4) (Eu3+: J = 1, 2, 4) for 1, and 5D4 → 7FJ (Tb3+: J = 3, 4, 5, 6) for 2. Energy transfer mechanism is explained by the energy level diagram of the Eu3+ and Tb3+ ions and of the isonicotinic acid ligand. The complexes have CIE chromaticity coordinates of (0.59, 0.35) and (0.29, 0.48) for 1 and 2, respectively.

A novel samarium complex {[Sm(IA)3(H3O)2]2n}(2nHgCl4)(nHg2Cl5)·nH3O·3nH2O (1) (HIA = isonicotinc acid) has been synthesized under solvothermal condition and structurally characterized by single-crystal X-ray diffraction. It possesses a one-dimensional (1-D) chain-like structure. Solid-state photoluminescence measurement shows that it displays red light emission bands. The emission bands result from the characteristic emissions of the 4f electrons intrashell transitions of 4G5/2 → 6HJ (J = 5/2, 7/2, 9/2 and 11/2) of the samarium(III) ions. Energy transfer mechanism is explained by the energy level diagram of the samarium(III) ion and isonicotinic acid ligand. Complex 1 has a remarkable CIE chromaticity coordinate of (0.6182, 0.3813); so, it is a potential candidate for red light emitting materials for light emitting diodes (LEDs). Solid-state UV/Vis diffuse reflectance spectrum reveals that complex 1 has a wide optical band gap of 3.23 eV.

A novel polyoxomolybdate with a diprotonated porphyrin as counter-cation, namely, 5,10,15,20-tetrakis(4-carboxyphenyl)-21H,22H,23H,24H-porphine(2+) hexamolybdate(VI) pentahydrate, (C48H32N4O8)[Mo6O19]·5H2O or (H2TCPP)[Mo6O19]·5H2O, I, was prepared via the hydrothermal reaction of MoCl5, 5,10,15,20-tetrakis(4-carboxyphenyl)-21H,23H-porphine (TCPP) and distilled water. The crystal structure of hydrated polyoxometalate (POM) salt I was characterized by single-crystal X-ray diffraction. The compound is characterized by an isolated (zero-dimensional, 0D) structure, because it cannot extend via covalent bonds. The structure contains one [Mo6O19]2− anion, one (H2TCPP)2+ cation and five lattice water molecules. Each of the Mo6+ ions is six-coordinated and displays a distorted octahedral motif. The (H2TCPP)2+ cation displays a distorted saddle motif. A three-dimensional (3D) supramolecular framework is formed via hydrogen-bonding interactions. The compound shows a red photoluminescence emission.

Lung cancer is one of the most malignant cancers around the world, with high morbidity and mortality. Metastasis is the leading cause of lung cancer deaths and treatment failure. MicroRNAs (miRNAs) and long non-coding RNAs (lncRNAs), two groups of small non-coding RNAs (nc-RNAs), are confirmed to be lung cancer oncogenes or suppressors. Transforming growth factor-β (TGF-β) critically regulates lung cancer metastasis. In this review, we summarize the dual roles of miRNAs and lncRNAs in TGF-β signaling-regulated lung cancer epithelial-mesenchymal transition (EMT), invasion, migration, stemness, and metastasis. In addition, lncRNAs, competing endogenous RNAs (ceRNAs), and circular RNAs (circRNAs) can act as miRNA sponges to suppress miRNAs, thereby mediating TGF-β signaling-regulated lung cancer invasion, migration, and metastasis. Through this review, we hope to cast light on the regulatory mechanisms of miRNAs and lncRNAs in TGF-β signaling-regulated lung cancer metastasis and provide new insights for lung cancer treatment.

Two novel lanthanide-mercury compounds [Ln(IA)3(H2O)2]n(Hg3Cl9)n·4nH2O (Ln = Eu (1) and Tb (2); IA = isonicotinic acid) have been synthesized under solvothermal conditions and structurally characterized by single-crystal X-ray diffraction. Both complexes exhibit one-dimensional (1D) chain-like structure with a novel isolated (Hg3Cl9)3– anion. Solid-state diffuse reflectance spectroscopy reveals the presence of wide optical band gaps of 2.81 eV and 3.47 eV, suggesting that they are potentially wide band gap organic semiconductor materials. Solid-state photoluminescence measurements uncover that they show red or green light emission bands, respectively. The emission bands can be assigned to the characteristic emission of the 4f electrons intrashell transitions of 5D0 → 7FJ (Eu3+, J = 2 and 4) and 5D4 → 7FJ (Tb3+, J = 6, 5, 4 and 3), respectively. Energy transfer mechanism is explained by the energy level diagram of Eu3+ ion, Tb3+ ion and isonicotinic acid ligand. The title compounds have remarkable CIE chromaticity coordinates of (0.6438, 0.3559) and (0.3172, 0.4773). This suggests that they may be potential candidates with red or green light emitting materials for white light emitting diodes (LEDs).

A novel europium complex with the mixed ligands of 1-methyl-3,5-bis(4′-carboxy-phenyl)-1,2,4-triazole (mbcpt) and p-phthalic acid (pa), [Eu2Cl2(H3O)2(μ4-mbcpt)2(μ4-pa)]n (1), has been synthesized under the solvothermal conditions and structurally characterized by single-crystal X-ray diffraction. Complex 1 exhibits a three-dimensional (3-D) metal-​organic framework. The 3-D open framework features a 2-fold-interpenetrated network. Solid-state diffuse reflectance spectroscopy uncovers the presence of a wide optical band gap of 3.56 eV, indicating that it is a wide band gap organic semiconductor material. Solid-state photoluminescence measurement reveals that complex 1 shows red light emission bands locating at 602, 611, 642 and 690 nm, which can be assigned to the 5D0 → 7FJ (Eu3+) with the value of J = 1, 2, 3 and 4, respectively. Magnetic measurements reveal that complex 1 shows an antiferromagnetic behavior.

Two novel mercury-lanthanide complexes [Hg3Cl6(u-IA)3Ln(H2O)2]n (IA = isonicotinic acid anion; Ln = Pr (1) and Sm (2)) have been synthesized under hydrothermal conditions and structurally determined by single crystal X-ray diffraction. Complexes 1 and 2 are isostructure and feature a three-dimensional (3-D) open framework with two types of one-dimensional (1-D) chains. Based on the condensed 3-D open framework, there is a large void space being 1010.3 A3 and 1018.1 A3 which occupy 27.2% and 27.4% of the unit-cell volume for complexes 1 and 2, respectively. Solid-state UV/Vis diffuse reflectance spectroscopy reveals that there is a wide optical band gap of 3.51 eV and 3.54 eV for complexes 1 and 2, respectively. Photoluminescence measurements using solid-state samples discover that both complexes display red light emission. The emission bands can be ascribed to the characteristic emission of the 4f electron intrashell transitions of the Ln3+ ions, i.e. 1D2 → 3H4 and 3P0 → 3F3 transitions for complex 1, as well as 4G5/2 → 6H5/2, 4G5/2 → 6H7/2 and 4G5/2 → 6H9/2 transitions for complex 2.

Three new mercury coordination polymers, [HgCl2(Hmtz)]n (1), (2) and [Hg2(mtz)4]n (3), were successfully prepared from HgCl2 and 5-methyltetrazole (Hmtz) and characterized by elemental analysis, thermal analysis, luminescence, theoretical calculation, powder X-ray diffraction and single-crystal X-ray diffraction. The results reveal that 1 and 2 are isomers resulted from different one dimensional (1D) mercury halides chains, and they are all 3D supramolecular structures. Complex 3 possesses a 2-fold interpenetrated diamondoid network with intersecting channels. Time-dependent density functional theory (TDDFT) calculations reveal that the mechanisms of the fluorescence emission are dominantly resulted from the ligand-to-metal charge transfer (LLCT) and partial ligand-to-ligand charge transfer (LLCT) for 1 and 2, but ligand-to-metal charge transfer (LMCT) for 3, which is in good agreement with their different fluorescence spectra and crystal structures. Optical absorption spectra indicate that complexes 1–3 have wide optical band-gaps and can be probably used as wide optical band-gap semiconductor materials.

A new inorganic-organic hybrid complex based on well-defined Keggin-type polyoxometalates and copper-lutidine assemblies, namely, [Cu3(3,5-Lutidine)6(PW12O40)]n (1), has been obtained under hydrothermal conditions and characterized by elemental analysis and single crystal X-ray diffraction. The X-ray diffraction analysis reveals that compound 1 is three-dimensional (3D) supramolecular structure with ‘sql’ topological 2D layer. The photocatalytic experiments indicate that 1 exhibit good catalytic activity for photodegradation of Rhodamine B (RhB) with UV irradiation. The thermal stabilities and fluorescent properties of this complex have also been studied.

A new multifunctional mixed-valence copper(I/II) coordination polymer, {[CuCN][Cu(isonic)2]}n (1) (Hisonic = isonicotinic acid), was synthesized by treating isonicotinic acid and 5-amino-tetrazolate (Hatz = 5-amino-tetrazolate) with copper(II) salts under hydrothermal conditions, and characterized by elemental analysis, infrared spectroscopy, and single crystal X-ray diffraction, respectively. The X-ray diffraction analysis reveals that compound exhibit noncentrosymmetric polar packing arrangement. It is three-dimensional (3D) framework with (3,5)-connected ‘seh-3’ topological network constructed from metal organic framework {[Cu(isonic)2]}n and the inorganic linear chain{Cu(CN)}n subunits. A remarkable feature of 1 is the rhombic open channels that are occupied by a linear chain of {Cu(CN)}n. Impressively compound 1 displays not only a second harmonic generation (SHG) response, but also a ferroelectric behavior and magnetic properties.

Under hydrothermal conditions, a novel europium complex [Eu(H2O)2 (Me-IN)3]n·2nH2O·3nClO4 (1; Me ​= ​methyl; IN ​= ​isonicotinic acid) was synthesized in situ and characterized. Complex 1 crystallizes in the monoclinic space group P21/c with four formula units in one cell. Complex 1 is characterized by a one-dimensional (1-D) chain-like structure. The solid state photoluminescence emission is in the red region and the emission peaks should come from the 5D0 → 7F1, 5D0 → 7F2 and 5D0 → 7F4 characteristic emission of the Eu(III) ions. It has a CIE (Commission Internationale de L’Eclairage) chromaticity coordinates of (0.5442, 0.4444). A solid-state UV–visible diffuse reflectance spectrum unveiled that it possesses a wide optical band gap of 4.98 ​eV.

Series of novel lanthanide complexes [Ln(4-carboxybenzenesulfonate)(H2O)5]nnCl (Ln = Sm (1), Gd (2), Dy (3)) have been synthesized through solvothermal reactions and the structures were characterized by single-crystal X-ray diffraction. They are isostructural with a ladder-shaped one-dimensional (1-D) double chain structure. The solid-state photoluminescence measurements reveal that complexes 1 and 2 display emission bands in yellow and ultraviolet region, while complex 3 shows an upconversion emission band in the green region. These emission bands are resulted from the characteristic emissions of the 4f electron intrashell transition of the 4G5/2 → 6HJ (J = 5/2, 7/2, 9/2; Sm(III) ions in 1), 6P5/2 → 8S7/2 (Gd(III) ions in 2) and 4F9/2 → 6H13/2 (Dy(III) ions in 3). Complexes 1 and 3 possess CIE (Commission Internationale de I'Eclairage) chromaticity coordinates of (0.518, 0.4806) and (0.3318, 0.6483), respectively. The CCT (Correlated Color Temperature) are 2415 K and 5609 K for complexes 1 and 3. The solid-state UV/visible diffuse reflectance spectra reveal that complexes 1, 2 and 3 have optical band gaps of 1.5 eV, 4.6 eV and 3.3 eV, respectively.

By means of a solvothermal reaction of isonicotinic acid and europium perchlorate, a novel europium(III) complex, i.e. catena-[tri(μ2-isonicotinato-O,O′)-(biaqua-europium(III))-(triperchlorate)-(monohydrate)], [Eu(HIA)3(H2O)2]n·3n(ClO4)·nH2O (1; HIA ​= ​isonicotinic acid), was obtained. The molecular structure of complex 1 was characterized by single-crystal X-ray crystallography. Complex 1 crystallized in the space group Pī of the triclinic system with a ​= ​9.5500(2), b ​= ​10.9680(3), c ​= ​15.1214(4) A, α = 104.299(2)°, β = 91.532(2)°, γ = 111.310(2)°, V ​= ​1417.92(6) A3, C18H21Cl3EuN3O21, Mr ​= ​873.69, Z ​= ​2, Dc ​= ​2.046 ​g/cm3, μ(MoKα) ​= ​2.595 ​mm−1 and F(000) ​= ​864. The europium(III)) ions are coordinated by eight oxygen atoms (of which six come from six HIA ligands and two come from two water molecules) and displays a EuO8 square antiprismatic geometry. The adjacent europium(III) ions are interlinked by four or two μ2-bridging HIA ligands to generate an infinite one-dimensional (1-D) –Eu–(HIA)4–Eu–(HIA)2–Eu–(HIA)4–Eu– chain running along the a axis. The chains are further connected by π···π stacking and hydrogen bonding interactions to yield a three-dimensional (3-D) supramolecular network. Complex 1 exhibits red photoluminescence emission bands at 593 ​nm, 617 ​nm and 699 ​nm, which are originated from the 5D0 → 7F1, 5D0 → 7F2 and 5D0 → 7F4 characteristic transitions of europium(III) ions. It has CIE chromaticity coordinates of (0.5742, 0.3275). A solid-state UV/Vis diffuse reflection spectrum shows that complex 1 has a band gap of 5.02 ​eV with a direct transition process.

A novel acentric char sulfate compound, [Cd(S 2 O 7 )(4,4’-bipyridine)(H 2 O) 2 ] n ( 1 ), has been solvothermally synthesized and characterized by single-crystal X-ray diffraction method. Compound 1 is characterized by a three-dimensional (3-D) inorganic-organic hybrid framework structure. Solid-state photoluminescent spectra indicate that compound 1 displays a strong violet emission. The second-order nonlinear optical measurements reveal that compound 1 has modest powder SHG efficiency of about 0.02 times than that produced by a potassium dihydrogen phosphate (KDP) powder. Optical absorption spectrum discovers that the presence of an optical gap of 3.41 eV, suggesting that compound 1 is a wide bandgap semiconductor.

Under hydrothermal conditions, two novel lanthanide (III)-mercury (II) compounds [Ln (IA)3(H3O)2]2n·2n (HgCl4)·n (Hg2Cl5)·nH3O·3nH2O (Ln ​= ​Eu, 1; Tm, 2; HIA ​= ​isonicotinic acid) were synthesized. The single-crystal X-ray diffraction revealed that they are isostructural and they feature a one-dimensional (1-D) chain-like structure and a three-dimensional (3-D) supramolecular network. Solid-state photoluminescence experiments revealed that they show red or blue emission bands, which can be assigned to the characteristic emissions of the 4f electron intrashell transitions of 5D0 → 7FJ (J ​= ​1, 2, 3, and 4; Eu3+, 1) or 1G4 → 3H6 (Tm3+, 2), respectively. The energy transfer mechanisms were revealed by the energy level diagrams of the Eu3+ or Tm3+ ions and isonicotinic acid ligand. Both compounds exhibit remarkable CIE chromaticity coordinates of (0.6454, 0.3543) and (0.1092, 0.1497) for 1 and 2, respectively. Solid-state UV–Vis–NIR diffuse reflectance spectra uncovered that they possess wide optical band gaps of 3.16 ​eV and 3.18 ​eV for 1 and 2, respectively.

Two novel heterometallic lanthanide/mercury compounds [Ln (HIA)3(H2O)2]n (Hg3Cl9)n·4nH2O (Ln ​= ​Sm3+ (1), Dy3+ (2); HIA ​= ​isonicotinic acid molecules) have been prepared under hydrothermal conditions and the crystal structures were characterized using single-crystal X-ray diffraction technique. They are isostructures and are characterized by a one-dimensional (1-D) chain-like structure with two kinds of 1-D chains coexisting in the structure. Solid-state photoluminescence measurements revealed that both compounds display upconversion emission bands in the green and yellow region. The bands originate from the characteristic emissions of the 4f electron intrashell transitions of the 4G5/2 ​→ ​6H5/2 (Sm(III) ions in 1) and 4F9/2 ​→ ​6H13/2 (Dy(III) ions in 2). An energy transfer mechanism is explained with an energy level diagram of Sm(III) ions, Dy(III) ions and isonicotinic acid molecules. Compounds 1 and 2 have CIE (Commission Internationale de I’Eclairage) chromaticity coordinates of (0.3609, 0.4812) and (0.4453, 0.5512). The CCT (Correlated Color Temperature) are 4926 ​K and 3726 ​K for compounds 1 and 2, respectively. Solid-state UV/visible diffuse reflectance spectra revealed that compounds 1 and 2 have wide optical band gaps of 2.98 ​eV and 3.19 ​eV, respectively.

A novel erbium-mercury complex [Er(HIA)3(H2O)2]n [0.5n (2,6-NA)](nHgBr4) (denoted as compound 1, HIA = isonicotinic acid; 2,6-NA = 2,6-Naphthalenedisulfonic acid) has been synthesized via a hydrothermal reaction and characterized by single crystal X-ray diffraction technique. Compound 1 features a one-dimensional (1-D) chain-like structure. A solid state photoluminescence measurement revealed that there are two upconversion emission peaks at 487 nm and 529 nm, of which the latter is stronger. These peaks can be assigned to the characteristic emission of 4f electron intrashell transitions of Er3+ ions 4F7/2 → 4I15/2 and 2H11/2 → 4I15/2. A energy transfer mechanism of photoluminescence emission was described using an energy state diagram of Er3+ ions and isonicotinic acid ligand. Compound 1 shows CIE chromaticity coordinates in the green region (0.1559, 0.5611). Compound 1 has a wide band gap of 2.05 eV, which was revealed by a solid-state UV/Vis diffuse reflection experiment.

Two novel samarium and thulium compounds [Sm(H2O)2(IA)3Hg2Cl5](HgCl2)1.5·H3O (1) and [Tm(H2O)2(IA)3Hg2Cl5](HgCl2)1.5·H3O (2) (IA ​= ​isonicotinate anion) have been prepared under hydrothermal conditions and structurally characterized by a single-crystal X-ray diffraction technique. They are isostructural and characterized by a two-dimensional (2-D) layer structure. The solid-state photoluminescence experiments unveiled that compound 1 shows a brownish emission band, while compound 2 exhibits three emission bands. These emission bands are resulted from the characteristic emissions of the 4f electrons intrashell transitions of 4G5/2 ​→ ​6H7/2 of the Sm3+ ion and 1G4 → 3H6, 1G4 → 3F4 and 3F2,3 ​→ ​3H6 of the Tm3+ ion. An energy transfer mechanism is proposed by an energy level diagram of the Sm3+, Tm3+ ions and the isonicotinic acid ligand. Compounds 1 and 2 have remarkable CIE chromaticity coordinates of (0.5261, 0.4615) and (0.2329, 0.218). The solid-state UV/visible diffuse reflectance spectra shows that compounds 1 and 2 have wide optical band gaps of 3.22 ​eV and 3.15 ​eV, respectively.

Three novel lanthanide upconverting materials [LN(2,5-HPA)(2,5-PA)]n (LN ​= ​Sm, 1; Dy, 2; Ho, 3; 2,5-H2PA ​= ​2,5-pyridinedicarboxylic acid) have been synthesized through hydrothermal reactions and structurally characterized by single crystal X-ray diffraction technique. These materials are crystallographically isostructural and are characteristic of three-dimensional (3-D) frameworks. The photoluminescence measurements with solid-state samples reveal that compounds 1–3 exhibit upconversion photoluminescence emissions in red, yellow and green region, respectively. The photoluminescence emission bands could be assigned to the characteristic emission of the 4f electrons intrashell transition of the 4G5/2 ​→ ​6H7/2, 4G5/2 ​→ ​6H9/2 of the Sm3+ ions in 1, 4F9/2 ​→ ​6H17/2, 4F9/2 ​→ ​6H15/2, 4F9/2 ​→ ​6H13/2 of the Dy3+ ions in 2, and 5G6 → 5I8, 5S2 → 5I8 of the Ho3+ ions in 3. An energy transfer mechanism is explained by the energy level diagrams of the lanthanide ions and the 2,5-H2PA ligand. Solid-state UV/Vis diffuse reflectance spectra reveal that they are potential wide optical band gap semiconductors with the band gaps being of 3.73, 3.56 and 3.45 ​eV for 1–3, respectively. TG curves reveal that all of them are very thermal stable with the onset temperature being of 219 ​°C–322 ​°C. The photoluminescence quantum yields of compounds 1–3 were determined to be 14.1%, 18.3% and 19.6%, respectively.

Three novel Ln–Hg complexes [Ln(H2O)2(μ-IA)3Hg3Br6]n (Ln = Pr (1), Nd (2), and Er (3); HIA is isonicotinic acid) are synthesized and characterized. They feature three-dimensional (3-D) motifs. Solid-state UV/vis diffuse reflectance spectroscopy found that their band gaps are 4.91, 4.59, and 2.68 eV. It is found that lanthanide ions could adjust the band structures of semiconductors. Their photoluminescence comes from their characteristic emissions of 1D2 → 3H4 of Pr3+, 7F7/2 → 4S3/2 and 4F3/2 → 4I9/2 of Nd3+, and 4I15/2 → 4F7/2 and 4I15/2 → 4S3/2 of Er3+. The CIE chromaticity coordinate is (x = 0.5726, y = 0.4206), (x = 0.7268, y = 0.2732), and (x = 0.2923, y = 0.4317). Their magnetization susceptibility totally obeys the Curie–Weiss equation with antiferromagnetic performances.

Four new mercury coordination polymers were successfully synthesized under solvothermal conditions and characterized by elemental analysis, IR spectroscopy, thermal analysis, powder X-ray diffraction and single-crystal X-ray diffraction. In these complexes, the chemical valence of mercury is +2, except for complex 1 which is +1. 1 contains [Hg2]2+ metal–metal bonded cores which are bounded by atz− (Hatz = 5-amino-tetrazolate) ligands and features a two-dimensional (2D) uninodal 3-connected ‘hcb’ network. 2 exhibits a trinodal 3D (3,6)-connected ‘apo/alpha-PbO2’ topological net in which 2D [HgCl]nn+ inorganic cation layers are pillared by atz− ligands. In 3, the 2D [HgCl]nn+ cation layers are interconnected by atz− ligands, affording a trinodal 3D (3,6)-connected ‘flu/fluorite’ topological net. 4 is a 3D pillared-layer metal–organic framework based on mixed atz− and isonicotinic ligands, showing a binodal (4,6)-connected ‘fsc’ coordination network. In this work, 1 and 4 were synthesized from an in situ generated tetrazolate ligand, while 2 and 3 were prepared from a commercially available tetrazolate ligand. These results indicate that the final structures of the target complexes will highly depend on the synthetic conditions as well as the preparation methods. Moreover, the photoluminescence properties of these complexes were investigated. Impressively, the non-centrosymmetric complex 3 displays not only a second harmonic generation (SHG) response but also a ferroelectric behavior.

A series of lanthanide porphyrins, [ LnIII(TPPSIV) ]n·n H 5 O 2 ( Ln = La , Sm , Eu ; H2TPPS = tetra(4-sulfonatophenyl)porphyrin), have been synthesized through solvothermal reactions and structurally characterized by single-crystal X-ray diffraction. These compounds are characterized by a condensed three-dimensional (3-D) porous open framework. Magnetic measurements reveal that these compounds show ferromagnetic, antiferromagnetic and paramagnetic behavior, respectively. All of the compounds exhibit highly thermal stability. The FT-IR and adsorption measurement of CO 2 were also studied.

The organically-templated uranyl selenite, (H2en)[(UO2)(SeO3)(HSeO3)](NO3)·0.5H2O (1) (en = 1,2-ethylenediamine) was synthesized and characterized by elemental analyses, IR spectroscopy, TG, and single-crystal X-ray diffraction. Compound 1 crystallizes in the orthorhombic system, space group Pbca, with a = 13.170(3) A, b = 11.055(2) A, c = 18.009(4) A, V = 2621.8(9) A3, M = 1316.19, Z = 4, Dcal = 3.334 g·cm–3, μ(Mo-Kα) = 17.998 mm–1, GOF = 1.059, R1 = 0.0263, wR2 = 0.0532 [I>2σ(I)]. The X-ray diffraction analysis reveals that compound 1 has a three-dimensional (3D) supramolecular structure. It contains negatively charged [UO2(HSeO3)(SeO3)]– inorganic anion layers and is balanced by [H2en]2+ cations and NO3– anions located in the interlayers. Furthermore, the photoluminescence properties of 1 were investigated.

A cadmium compound CdI2(phen)2, (1) (phen = 1,10-phenanthroline), was been synthesized via a hydrothermal reaction and structurally characterized by single-crystal X-ray diffraction. The cadmium ion is coordinated by two terminal iodine ions and four nitrogen atoms from two coordinating phen molecules, constructing a distorted octahedron. Compound 1 features an isolated structure. Photoluminescent study shows that compound 1 exhibits a strong and broad emission in the blue region. Theoretical investigation reveals that the emission can be attributed to ligand to ligand charge transfer.

Three new compounds, {[Zn(tza)2(H2O)]·H2O}n (1), {[Mn(tza)2(Htza)2]·2H2O}n (2) and [Cd(tza)2]n (3), were obtained by reactions of 1H-Tetrazole-1-acetic (Htza) with corresponding metal salts, and characterized by elemental analysis, infrared spectroscopy, and single crystal X-ray diffraction, respectively. The X-ray diffraction analysis reveals that compound 1 is three-dimensional (3D) supramolecular structure with line chains. Compound 2 is three-dimensional (3D) supramolecular structure with Mn-carboxylate chains. Compound 3 is a 3D framework with (3,6)-connected ‘ant’ topological network. Furthermore, the photoluminescence of 1 and 3 and the magnetic properties of 2 have also been investigated.

A novel cadmium complex with mixed ligands {[Cd(2,2'-biim)(4,4'-bipy)(H 2 O)(ClO 4 )] (ClO 4 )} n ( 1 ) (2,2'-biim = 2,2'-biimidazole; 4,4'-bipy = 4,4'-bipyridine) has been synthesized through hydrothermal reaction and its crystal structure was determined by single-crystal X-ray diffraction technique. Single-crystal X-ray diffraction analyses revealed that complex 1 crystallizes in the space group Pna 2 1 of the orthorhombic system and exhibits a one-dimensional zigzag chain structure consisting of [Cd(2,2'-biim)(4,4'-bipy)(H 2 O)(ClO 4 )] n n + cationic chains and isolated ClO 4 – anions. Powder photoluminescent characterization reveals that complex 1 has an emission in the green region of the spectrum. Time-dependent density functional theory (TDDFT) calculation showed that the nature of the photoluminescence of complex 1 is originated from the ligand-to-ligand charge transfer (LLCT; from the HOMO of the perchlorate anions to the LUMO of the 4,4'-bipy ligand). A wide optical band gap of 3.25 eV was found by the solid-state UV/vis diffuse reflectance spectrum.

A novel zinc compound with mixed ligands, Zn2(bipy)(bim)4·(ClO4)4·2H2O (1) (bipy = 4, 4′-bipyridine; bim = 2, 2′-biimidazole), was hydrothermally prepared and characterized by elemental analysis, IR spectroscopy, photoluminescence and single-crystal X-ray diffraction. Compound 1 is characteristic of an isolated structure with two five-coordinated zinc ions bridged by a bipy ligand to form a dumbbell-like motif. Compound 1 is of rhombohedral system, space group R-3 with a = 25.7698(5), c = 19.0359(7) Å, V = 10947.8(5) Å3, C34H36Cl4N18O18Zn2, Z = 9, M r = 1257.35, D c = 1.716 g/cm3, S = 1.045, μ(MoKα) = 1.298 mm–1, F(000) = 5742, R = 0.0489 and wR = 0.1337. Photoluminescence investigation reveals that compound 1 displays an emission band in the green region. In combination with the theoretical studies, it is believed that the emission must arise from the ligand-to-ligand charge-transfer (LLCT) transition.

A new cadmium-biimidazole compound, [Cd(2,2′-biimidazole)2(ClO4)]nnOH·2nH2O (1), has been obtained via solvothermal reactions and structurally characterized by X-ray single-crystal diffraction. Compound 1 crystallizes in the space group P21/c of the monoclinic system with four formula units in a cell: a = 6.8785(11), b = 17.938(3), c = 14.985(2) A, β = 91.589(2)°, V = 1848.3(5) A3, C12H17CdClN8O7, Mr = 533.19, Dc = 1.916 g/cm3, S = 1.048, μ(MoKα) = 1.383 mm−1, F(000) = 1064, R = 0.0326, and wR = 0.0900. Compound 1 is characteristic of an infinite one-dimensional chain-like structure.

The complex [Zn(2,2'-biimidazole)2H2O]4(SO4)4·12H2O has been synthesised by solvothermal reaction and structurally characterised by single crystal X-ray diffraction. The zinc ion coordinates to fou...

A gadolinium compound [Gd(TPPS)] n ·nH3O (1) (TPPS = tetra(4-sulfonatophenyl)porphyrin) was synthesized by a hydrothermal reaction. Compound 1 was characterized by FT-IR, UV–vis spectra, fluorescence, quantum yield, luminescence lifetime, CV and X-ray diffraction analyses. Compound 1 features a three-dimensional (3-D) porous open framework with lattice water molecules residing at the voids. The 3-D framework is comprised of TPPS moieties and Gd3+ nodes. Photoluminescence measurements reveal that compound 1 exhibits a sharp emission band in the red region with an emission quantum yield being of 5.8 %. Nanosecond transient spectra discover that the fluorescence lifetime of 1 is 11.7 ns. The voltammetric behavior of 1 displays one reduction and two oxidation potentials at −1.75, −0.71 and −1.07 V, respectively. A gadolinium compound was synthesized via a hydrothermal reaction. It features a 3-D porous open framework which is comprised of TPPS moieties and Gd3+ nodes. It exhibits a sharp emission band in the red region with an emission quantum yield being of 5.8 % and a fluorescence lifetime being of 11.7 ns. The CV displays one reduction and two oxidation potentials.

Two new isonicotinic acid-containing lanthanide complexes, [Eu(HL)3(H2O)2]2n·(nH5O2)(nHgCl5)(2nHgCl4)·(2nH2O) (1) and [GdL2(H2O)4]nnCl (2) (HL = isonicotinic acid), have been synthesized via hydrot...

A terbium-zinc porphyrin, i.e. [TbZn(TPPS)H3O]n (1) (TPPS=tetra(4-sulfonatophenyl)porphyrin), has been obtained from a solvothermal reaction and structurally analyzed by single-crystal X-ray diffraction. Compound 1 is characteristic of a condensed three-dimensional (3-D) porous open framework with two types of infinite one-dimensional (1-D) chain-like structure. Compound 1 exhibits a void space of 215 A3, which is 9.2% of the unit-cell volume. TG/DTA measurement reveals that the framework of compound 1 is thermally stable up to 336 °C. In order to reveal its photophysical and electrochemical properties, we investigated compound 1 in detail with UV–vis spectra, fluorescence, quantum yield, luminescence lifetime, and CV/DPV.

A novel 4f–3d metalloporphyrin, [EuZn(TPPS)H3O]n (1) (H2TPPS = tetra(4-sulfonatophenyl)porphyrin), has been synthesized via a solvothermal reaction and structurally characterized by single-crystal X-ray diffraction. Compound 1 features a three-dimensional (3-D) structure with two kinds of one-dimensional (1D) infinite chains. Based on the condensed 3-D porous open framework, compound 1 has a large void space of 223 A3, corresponding to 9.4% of the unit-cell volume. Compound 1 shows high thermal and aqueous stability. Magnetic measurements reveal that compound 1 has an antiferromagnetic behavior.