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Eight homochiral lanthanide coordination polymers, namely [Ln2L3(H2O)2]n·4nH2O [Ln = Sm (1); Eu (2); Gd (3); Tb (4); Dy (5); Ho (6); Er (7); Yb (8)], based on an achiral rigid ligand, 5-[(pyridin-4-ylmethyl)amino]-isophthalic acid (H2L), have been hydrothermally prepared and characterized by single X-ray diffraction, elemental analysis, infrared spectroscopy, thermogravimetric analysis, powder X-ray diffraction, and circular dichroism spectroscopy. Compounds 1–8 featured three-dimensional frameworks with triple-stranded helical chains, exhibiting a topological structure with the Schläfli symbol {45·6·104}{45·6}. Solid-state circular dichroism (CD) spectroscopy revealed the occurrence of spontaneous chiral symmetry breaking during crystallization and that the origin of chirality might be the helicity. Furthermore, luminescence and second harmonic generation (SHG) activity have been studied. Compound 5 showed SHG activity. Compounds 1, 2 and 4 displayed characteristic luminescence stemming from the trivalent lanthanides. [ABSTRACT FROM AUTHOR]

Two novel cadmium-based isomeric coordination polymers constructed from naphthalenediimide chromophoric components and aromatic dicarboxylic acids, [Cd(DPMNI)(m-BDC)]n (1) and [Cd(DPMNI)(p-BDC)]n (2) (DPMNI = N,N′-bis(4-pyridylmethyl)-1,4,5,8-naphthalenediimide, m-BDC2− = isophthalate, p-BDC2− = terephthalate) have been synthesized by solvothermal reactions and characterized systematically. Single-crystal X-ray diffraction analyses results indicate that compounds 1–2 possess the same basic building block, but show different 2D resultant constructions. The formation of non-covalent intermolecular interactions (CH–π, π–π, lone pair–π interactions) can not only generate 3D supramolecular structures, but also improve structural thermostabilities up to approximately 405 °C and 330 °C, according to their thermogravimetric analyses (TGA) results. Importantly, due to the stereocontrolled self-assembly of the isomeric coordination polymers, two kinds of lone pair–π interactions with varying strengths have been produced leading to different photochromic behaviors in 1–2. It is worth mentioning that the immediate photochromism of 1 is rare in NDI-based photochromic materials. Moreover, their photoluminescence properties have also been investigated to enrich the research on crystal photophysical properties. [ABSTRACT FROM AUTHOR]

Two series of Ln-MnII heterometallic coordination polymers (HCPs), [Ln8Mn3(µ3-OH)8(IN)14Cl6(H2O)16] n(OH)2 n ·5 nDMF ·8 nH2O {Ln = Gd ( 1); Ln = Dy ( 2)} and [Ln2Mn(IN)6Cl2(H2O)4] n ·2 nDMF {Ln = Gd ( 3); Ln = Dy ( 4), IN = isonicotinic cation}, were synthesized by using fractional crystallization and structurally characterized. Polymers 1 and 2 are isostructural and form a 2D double layer of [Ln4(µ3-OH)4] cubane and Mn(IN)4Cl2 units, whereas 3 and 4 are isomorphic and form a four-connected cds-type 3D framework assembled from paddle-wheel binuclear Ln2(COO)4 units and planar Mn(IN)4Cl2 units. Polymers 1- 4 exhibited large magnetic entropy changes of 42.0, 16.7, 31.5, and 16.6 J kg-1 K-1, respectively (Δ H = 7 T). In addition, compounds 2 and 4 displayed field-induced slow magnetic relaxation behavior. [ABSTRACT FROM AUTHOR]

Four new coordination polymers, [Mn(CuL)(aipt)] ( 1 ), [Ni(CuL)(aipt)(H 2 O)]·H 2 O ( 2 ), [Mn(NiL)(tpt)]·1/4H 2 O ( 3 ) and [Mn(NiL)(atpt)] ( 4 ) (ML, H 2 L = 2, 3-dioxo-5, 6, 14, 15-dibenzo-1, 4, 8, 12-tetraazacyclo-pentadeca-7, 13-dien; H 2 aipt = 5-aminoisophthalic acid; H 2 tpt = terephthalic acid; H 2 aipt = 2-aminoterephthalic acid), have been synthesized by a solvothermal method and their structures are characterized by single-crystal X-ray diffraction. Complex 1 exhibits a 1D chain structure formed by Cu 2 Mn 2 units connected via oxamide and 5-aminoisophthalate bridges, while complexes 2 , 3 and 4 exhibit different 2D layered structures formed by Cu 2 Ni 2 ( 2 ) and Mn 2 Ni 2 ( 3 – 4 ) units, connected via oxamide and diverse carboxylate bridges. Magnetic studies demonstrate that antiferromagnetic interactions exist between the neighboring metal ions through the oxamide and/or carboxyl bridges in complexes 1 – 4 . [ABSTRACT FROM AUTHOR]

Seven coordination polymers {[M(L)2(H2O)2]·(NO3)2}n(M = Co (1), Ni (2), Cd (3)) and [M(L)(ox)]n(M = Co (4), Ni (5), Zn (6), and Mn (7)) have been synthesized (L = 2,6-bis(imidazol-1-yl)pyridine, ox = oxalate) under hydrothermal conditions. Single-crystal X-ray diffraction analysis has revealed that1–3are isomorphous and possess 2-D networks, whereas4–6are isomorphous, but involve two kinds of oxalate chains. The structure of7is different from those of4–6due to various bridging modes of the oxalate ligand. Magnetic studies have revealed that1,2,4,5, and7exhibit strong antiferromagnetic coupling. Among these,1exhibits an interesting spin-canting phenomenon. In hydrothermal reactions, seven coordination polymers were synthesized. Single-crystal X-ray diffraction analysis revealed that compounds1–3possess 2-D networks, whereas compounds4–6involve two kinds of oxalate chains. The structure of7adopts a 3-D framework structure due to various bridging modes of the oxalate ligand. Magnetic studies have revealed that compounds1,2,4,5, and7exhibit strong antiferromagnetic coupling. [ABSTRACT FROM AUTHOR]

Three coordination polymers [Pb2(nipt)2(NiL)2] ( 1), [Pb(tpt)(NiL)] ·2H2O ( 2), and [Pb2(ipt)2(NiL)2] ( 3) (ML, H2L = 2, 3-dioxo-5, 6, 14, 15-dibenzo-1, 4, 8, 12-tetraazacyclo-pentadeca-7, 13-dien, H2nipt = 5-nitroisophthalic acid, H2tpt = terephthalic acid, H2ipt = isophthalic acid) were synthesized by solvothermal methods and characterized by single-crystal X-ray diffraction. Complex 1 exhibits a zigzag chain consisting of Pb2Ni2 units with oxamide and 5-nitro isophthalate bridges, whereas complex 2 possesses a double chain with oxamide and terephthalate bridges. Complexes 1 and 2 have a 2D supramolecular architecture formed by intermolecular interactions and hydrogen bonds. Complex 3 exhibits a two-dimensional network structures formed by Pb4Ni4 units via oxamide and isophthalate bridges. In complexes 1- 3, the arrangement of donor atoms suggest that the coordination around the lead(II) atoms is hemi-directed. The different steric hindrance of bridged ligands, and lone pair electrons effect of lead(II) ion cooperatively influence nipt, tpt and ipt displaying in diverse connecting modes and further result in different structures. Additionally the fluorescence properties of compounds 1- 3 are discussed. [ABSTRACT FROM AUTHOR]

Hydrothermal reaction of rare earth oxides with 1H-benzimidazole-5,6-dicarboxylic acid (H 3 bidc) and MnSO 4 ·H 2 O afforded a series of new three-dimensional (3D) coordination polymers, namely, [Ln 2 Mn(Hbidc) 2 (SO 4 ) 2 ·8H 2 O] n (Ln = Sm ( 1 ), Eu ( 2 ), Tb ( 3 ), Dy ( 4 ) and Ho ( 5 )) and [Gd 2 Mn(Hbidc) 2 (SO 4 ) 2 ·7H 2 O] n ( 6 ). Their structures have been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, FT-IR, powder X-ray diffraction and thermogravimetric analyses (TGA). The single-crystal X-ray diffraction analysis reveals that coordination polymers 1 – 6 have similar 3D frameworks fabricated through Hbidc 2 − and SO 4 2 − bridging dinuclear lanthanide secondary building units. Moreover, the photoluminescence of complexes 1 – 4 and magnetism of complexes 4 and 6 have been investigated, 4 exhibits remarkably slow magnetic relaxation behavior with the energy barrier Δ E / k B = 83.3 K. [ABSTRACT FROM AUTHOR]

Three two-dimensional coordination polymers {[Zn(H-3, 3-bpma)(1, 2,4-btc)] ·H2O} n ( 1), {[Cu2(H-3, 3-bpma)2(1, 2,4-btc)(H-1, 2,4-btc)(H2O)2] ·ClO4 ·7.75H2O} n ( 2), and {[Cd4(H-3, 3-bpma)2(1, 3,5-btc)3Cl(H2O)7] ·12.75H2O} n ( 3) [3, 3-bpma = N, N′-bis(3-pyridylmethyl)amine, H3-1, 2,4-btc = 1, 2,4-benzenetricarboxylic acid, and H3-1, 3,5-btc = 1, 3,5-benzenetricarboxylic acid] were synthesized and characterized by X-ray crystallography. The complexes are all two-dimensional layer networks with diverse topologies bridged by mixed flexible bis(pyridylmethyl)amine and auxiliary rigid aromatic multicarboxylate ligands. The H-3, 3-bpma ligands adopt different conformations, whereas the aromatic multicarboxylates show various binding modes in the complexes. The magnetic, photoluminescence and thermal properties for complexes 1 and 2 were investigated. [ABSTRACT FROM AUTHOR]

Abstract: Six new coordination polymers, [Co(NiL)(aipt)] (1), [Co2(ML)(hipt)2(CH3OH)(H2O)]·CH3OH (M=Cu (2), Ni (3)), [Co2(C2O4)2(CuL)2] (4), [Co4(NiL)4(ipt)4(H2O)2] (5) and [Co(CuL)(tpt)] (6) (H2L=2,3-dioxo-5,6,14,15-dibenzo-1,4,8,12-tetraazacyclo-pentadeca-7,13-dien; H2aipt=5-aminoisophthalic acid; H2hipt=5-hydroxyisophthalic acid; H2ipt=isophthalic acid; H2tpt=terephthalic acid), have been synthesized by a solvothermal method and characterized by single-crystal X-ray diffraction. Complexes 1, 4 and 5 exhibit different infinite chain structures formed by CoNi (1), Co2Cu2 (4), Co4Ni4 (5) units, respectively, via oxamide and diverse carboxylate bridges, while complexes 2, 3 and 6 exhibit different two-dimensional network structures formed by Co2M or Co2M2 units via oxamide and 5-hydroxyisophthalate or terephthalate bridges. The results of magnetic determination show weak antiferromagnetic interactions in 1–3 and 5–6, and the spin–orbit coupling interaction of Co(II) is a primary factor in the magnetic behaviors. [Copyright &y& Elsevier]

Three new lanthanide-organic coordination polymers, {[ Ln2(bpdc)2(H2O)6(NO3)] ·NO3} [ Ln = La ( 1), Ce ( 2), Pr ( 3)] (H2bpdc = 2, 2′-bipyridine-6, 6′-dicarboxylic acid) were synthesized under hydrothermal conditions and structurally characterized by elemental analysis, IR spectroscopy as well as single-crystal and powder X-ray diffraction. Single-crystal X-ray diffraction analysis revealed that compounds 1- 3 are isostructural, composed of two dimensional honeycomb network linked by bpdc ligands. The magnetic property of compound 3 was investigated. [ABSTRACT FROM AUTHOR]

A series of lanthanide-organic framework coordination polymers, {[La2(TDC)2(NO3)(H2O)4](OH)·5H2O}n(1) and [Ln(TDC)(NO3)(H2O)]n(TDC = thiophene- 2, 5- dicarboxylic acid; Ln = Nd(2), Sm(3), Eu(4), Gd(5), Tb(6), Dy(7), Ho(8), Er(9), Yb(10)) have been synthesized by solvothermal reaction and characterized by elemental analysis, FT-IR, TG analysis, single-crystal X-ray diffraction and power X-ray diffraction. The single-crystal X-ray diffraction analysis results show that 1displays a 3-D porous framework with (3,7)-connected {410.611}{43} topology. The compounds 2–10crystallized in the same P21/cspace group and exhibits a (3,6)-connected {4.62}2{42.610.83} topology, Right-handed and left-handed helical chains coexist in the 2-D layer structure. The luminescence properties of 2–10and the magnetic properties of 5,7,8,9were investigated. [ABSTRACT FROM AUTHOR]

Solvothermal reactions of mixed ligands H3BTC and macrocyclic oxamide complexes (ML, M = Cu, Ni) with M(ClO4)2·6H2O (M = Co, Zn, Ni and Cd) afford six new complexes, including [M′4(BTC)2(ML)2(OH)2(H2O)2]·2H2O (M′ = Co, M = Ni, for (1); M′ = Zn, M = Ni, for (2); M′ = Zn, M = Cu, for (3)), [Ni3(BTC)2(NiL)2(H2O)6]·2CH3OH·2H2O (4), [Cd4(BTC)2(HBTC)(NiL)4(H2O)]·3H2O (5) and [Cd(HBTC)(CuL)]·H2O (6) (ML, H2L = 2, 3-dioxo-5, 6, 14, 15-dibenzo-1,4,8,12-tetraazacyclo-pentadeca-7,13-dien; H3BTC = 1,3,5-benzenetricarboxylic acid). Complexes 1–3consist of a 2D layer framework formed by the linkage of M(ii)(M = Ni, Cu) and M′4(M′ = Co, Zn) cluster viathe oxamide and BTC3−bridges and display a (3,6)-connected network with a (43)2(46.66.83) topology. The structure of 4consists of pentanuclear [NiII5] units and arranges in a 1D cluster chain. Complex 5exhibits a 2D layered structure characterized by 3,4,3-connected (4.62)3(4.63.82)(42.63.8)(42.6) topology. Complex 6possesses a 3D network with sratopology. The magnetic properties of complexes 1and 4were investigated. [ABSTRACT FROM AUTHOR]

Abstract: Three novel coordination polymers [(Eu2(Hbidc)2(ox)2·(H2O)3] (1), [Tb2(Hbidc)2(ox)(H2O)2]·4H2O (2), [Er2(Hbidc)2(ox)] (3) have been synthesized with hydrothermal reaction (H3bidc=Benzimidazole-5,6-dicarboxylic acid, H2ox=Oxalic acid) and characterized by elemental analysis, IR and X-ray single crystal diffraction. 1, 2 and 3 have the same crystal system of triclinic, but they exhibit different kinds of metal-organic framework structures. The luminescent properties of 1 and 2 were studied at room temperature. [Copyright &y& Elsevier]

Abstract: A novel 4d–4f heterometallic coordination polymer [EuAg(imdc)2] n (1) (imdc=imidazoledicarboxylate) has been hydrothermally synthesized and characterized by elemental analysis, IR, and single-crystal X-ray diffraction. X-ray single-crystal structural analysis reveals that 1 is a three-dimensional framework. Furthermore, 1 also displayed photoluminescent properties in the red range at room temperature. [Copyright &y& Elsevier]

A series of 3d-4f heterometallic coordination polymers (CPs), namely, Ln 2 (CuL) 2 (nipt) 3 (H 2 O)]⋅nH 2 O (Ln = Sm 1 , Nd 2 , Gd 3 , for 1 – 2 n = 2, for 3 n = 1.6), [Yb 2(CuL) 4 (nipt) 3 ]·3.5H 2 O (4), [Pr 2 (NiL)(nipt) 3 (H 2 O)]⋅1.5H 2 O (5), [Sm 2 (NiL)(nipt) 3 (H 2 O) 2 ]CH 3 OH⋅H 2 O (6), [Er 2 (NiL) 2 (nipt) 3 (H 2 O) 2 ]⋅3H 2 O (7) (ML, H 2 L = 2, 3-dioxo-5, 6, 14, 15-dibenzo-1, 4, 8, 12-tetraazacyclo-pentadeca-7, 13-dien; H 2 nipt = 5-nitroisophthalic acid) were obtained by a solvothermal method and structurally characterized. Complexes 1–3 have 3,3,4,5-connected (3.4.5)(32.42.5.63.72)(42.63.8)(42.6) topological structure consisting of two different chains. 4 exhibits a two-dimensional (2D) heterometallic structure with 3-connected (63) topology. 5 displays a 2D framework formed by four-strand meso-helical chains and characterized by 6,6,4,4,4-connected (411.64)(412.63)(43.62.8)(45.6) 2 topology. Compound 6 has 3,4,4,3-connected (43)(44.62)(42.124)(42.6) topological structure formed by three-strand meso-helical chains. In 7 , two kinds of μ 3 -bridged nipt2− ligands together with NiL connect the eight-coordinated Er3+ ions to form a 2D structure, and the 2D layers are extended by μ 2 -bridged nipt2− into a three-dimensional (3D) microporous framework with 4,4,3,3-connected (4.62.83) 2 (4.82) 2 topology. Interestingly, for 1 , 2 and 4 , CuL-sensitized the near-infrared emissions form Sm(III), Nd(III) and Yb(III) were firstly found under visible light irradiation. Moreover, the magnetic properties of 1 , 2 , 4 and 5 are also discussed. Image 1 [ABSTRACT FROM AUTHOR]

Four new isostructural coordination polymers, [M 2 (μ 2 -H 2 O)(DTBC) 2 ] (CTGU- 26(M), M ​= ​Zn, Cd, Co and Ni] have been prepared with a new butterfly-typed nitroheterocyclic 4,6-di- 1H-1,2,4-triazol-1-yi-1,3-benzenedicarboxylic acid(H 2 DTBC) ligand and metal salts under hydrothermal condition. CTGU-26(Zn) features an unusual 2-nodal (4, 8)-connected scu topological network generated by [Zn 2 (μ 2 -H 2 O)(COO) 4 ] units and DTBC2− anion linkers. Luminescent properties measurements indicate that both CTGU-26(Zn) and CTGU-26(Cd) show intense fluorescence-emission compared with free H 2 DTBC ligand in solid state. Moreover, the electrocatalytic activities of CTGU-26(Co) and CTGU-26(Ni) towards methanol oxidation reaction (MOR) of two compounds were also investigated. Remarkably, by combining each MOF with the conductive 2,3,6,7,10,11-hexahydroxytriphenylene(HHTP) additive, a composite material, HHTP/CTGU-26(Ni)–I was confirmed to have an excellent performance for MOR with a high mass specific peak current of 25.55 ​mA ​cm−2. Four new isostructural coordination polymers, [M 2 (μ 2 -H 2 O)(DTBC) 2 ] (CTGU-26(M), M ​= ​Zn, Cd, Co and Ni] have been prepared with one new butterfly-typed nitroheterocyclic carboxylate ligand was prepared and characterized. And the luminescent properties and methanol oxidation reaction were also discussed. [Display omitted] • Four new isostructural coordination polymers have been prepared with a new butterfly-typed nitroheterocyclic carboxylic acid. • They feature an unusual 2-nodal (4,8)-connected scu topological network generated by binuclear units and DTBC2− anion linkers. • The luminescent properties and the electrocatalytic MOR activities of four complexes has been studied and discussed. [ABSTRACT FROM AUTHOR]

• Structural features of lanthanide coordination polymers are reviewed. • Crystal structures of lanthanide coordination polymers are provided. • Coordination environment of lanthanides is discussed. • The role of lanthanides in modulating the structural pattern is revealed. • Catalytic applications of lanthanide coordination polymers are highlighted. The review showcases the structural features of an array of recently reported lanthanide coordination polymers with catalytic properties. The field of lanthanide coordination polymers has considerably progressed during the last decade placing it at the forefront of the materials science. The wealth of obtained data clearly demonstrates that lanthanides play a determinant role in tailoring the structural pattern, coordination environment, dimensional configuration and network architecture of coordination polymers. As a rule, the lanthanide(III) ions possess a high coordination number and a large atomic radius, and because of that they tend to generate highly connected complex structures with different coordination geometry. In this way, they easily build two-dimensional and three-dimensional architectures with definite channels and permanent pores. Owing to their strong oxophilic propensity and hard Lewis acid character, lanthanides effectively succeed in creating robust, stable coordination polymers and MOF structures and viable matrices via strongly binding the coordinating groups of the accurately selected organic linkers. Such unique particularities involve a distinct morphology, diverse crystal structures, uniform porosity, a defined pore size and shape, precisely controlled number and dimensions of channels. Their specifically designed configurations allow the access of guest molecules and a controlled distribution of the metal ions on the surface or within the network. Additionally, the lanthanide ions afford new synergistic Lewis acid sites beneficial for productive catalytic applications. These attractive capabilities of lanthanide coordination polymers enabled them to be fruitfully used as sustainable and recyclable heterogeneous catalysts in diverse organic transformations. like carbon-carbon bond forming, Strecker reaction, CO 2 cycloaddition, Knoevenagel condensation, hydroboration and cyanosilylation. [ABSTRACT FROM AUTHOR]

[Display omitted] • A two-dimensional europium coordination polymer [Eu(dlba)(phen)·2(H 2 O)]n (CP-1) was prepared based on 1,10-phenanthroline and 2-(3,5-dicarboxybenzyloxy) benzoic acid. • The CP-1 exhibits excellent water stability and thermal stability. • The CP-1 shows good sensitivity, rapid response time and low detection limit in detection dipicolinic acid. The development of luminescence sensors capable of detecting anthrax biomarkers is crucial for preventing anthrax. In this study, a two-dimensional europium coordination polymer [Eu(dlba)(phen)·2(H 2 O)] n (CP-1) was prepared based on a rigid 1,10-phenanthroline (phen) and a flexible 2-(3,5-dicarboxybenzyloxy) benzoic acid (H 3 dlba) under the hydrothermal conditions. The CP-1 was characterized by powder X-ray diffraction, elemental analysis, thermogravimetric analysis, infrared spectroscopy, and single crystal X-ray diffraction. The CP-1 exhibits excellent water stability and thermal stability. Luminescence experiments demonstrated a high luminescence quenching efficiency (98.1 %) upon addition of the anthrax biomarker dipicolinic acid (DPA). Additionally, the sensor shows good sensitivity and a rapid response time of 30 s. The detection limit is as low as 0.12 µM, which is much lower than the infection dose of spores (60 µM). The sensor has a recovery rate of 95–105 % when tested on actual samples, indicating its potential for practical applications. The luminescence quenching effect may be due to the competitive absorption of DPA, which affects the efficiency of energy transfer from the ligands to the europium ions. [ABSTRACT FROM AUTHOR]

Three new coordination polymers, {[Ln(cbb)(Hcbb)(DMF)·H2O] n , Ln = Sm (1), Eu (2), Tb(3), H2cbb = 2-(4-carboxybenzyloxy) benzoic acid, DMF = N , N -dimethylformamide}, have been synthesised by a solvothermal reaction and structurally characterised by infrared spectroscopy, elemental analysis, thermogravimetry analysis, and X-ray single-crystal diffraction. The results of single-crystal X-ray diffraction indicate that the coordination polymers 1 – 3 are isostructural, belong to a triclinic system, space group P -1, and show 1D chain structures through the H2cbb ligands connecting adjacent lanthanide ions. In addition, the fluorescence properties of polymers 1 – 3 were also investigated. Three coordination polymers ([Ln(cbb)(Hcbb)(DMF)·H2O] n [Ln = Sm (1), Eu (2), Tb (3)] have been synthesised based on 2-(4-carboxybenzyloxy) benzoic acid and the fluorescence properties have been investigated in detail. [ABSTRACT FROM AUTHOR]

Graphical Abstract Eight novel three-dimensional lanthanide coordination polymers, [Ln(dcob)(DMF)(H 2 O)] n based on 2-(3,5-dicarboxybenzyloxy) benzoic acid, were prepared and characterized. 3 , 4 , 6 and 7 show luminescence of the trivalent lanthanides. Highlights • Eight lanthanide coordination polymers were prepared and characterized. • The structure shows a 3D framework with [Ln 2 (dcob) 6 (DMF) 2 (H 2 O) 2 ] building block. • 3 , 4 , 6 and 7 show luminescence of the trivalent lanthanides. Abstract A series of novel three-dimensional lanthanide coordination polymers with the building block [Ln 2 (dcob) 6 (DMF) 2 (H 2 O) 2 ], [Ln(dcob)(DMF)(H 2 O)] n [Ln = Pr (1), Nd (2), Sm (3), Eu (4), Gd (5), Tb (6), Dy (7), Er (8), H 3 dcob = 2-(3,5-dicarboxybenzyloxy) benzoic acid, DMF = N , N -dimethylformamide], were prepared under hydrothermal conditions and characterized by X-ray single-crystal diffraction, infrared spectroscopy, elemental analysis and thermogravimetric analysis. 3 , 4 , 6 and 7 show luminescence of the trivalent lanthanides. [ABSTRACT FROM AUTHOR]

[Display omitted] • Four 3D Ln-MOFs based on the imidazolium ligand were prepared and characterized. • Ln-MOFs display a pillar-layer porous structure with 3D open channels. • Compounds 1 , 2 and 4 exhibit the luminescence of the trivalent lanthanide ions. A series of novel three-dimensional lanthanide metal–organic frameworks (Ln-MOFs) were prepared under solvothermal conditions. These Ln-MOFs are formulated as [Ln 4 (L) 3 (H 2 O) 8 ] n ·3nNO 3 , [Ln = Sm (1), Eu (2), Gd (3), Tb (4), H 4 L+Cl- = 1,3-bis(3,5-dicarboxyphenyl) imidazolium chloride]. Complexes 1 – 4 were characterized by X-ray single-crystal diffraction, infrared spectroscopy, powder X-ray diffraction and thermogravimetric analysis. Compounds 1 , 2 and 4 display the luminescence of the trivalent lanthanide ions, due to the 4f n -4f n transitions. In addition, the luminescence lifetime of 2 has been thoroughly investigated. [ABSTRACT FROM AUTHOR]

The hydrothermal reaction of Ln(NO3)3·6H2O, 3-(4-carboxyphenyl)-2,6-pyridinedicarboxylic acid (H3cppdc) and N,N-dimethylformamide (DMF) gave a series of lanthanide coordination polymers n[NH2(CH3)2]·[Ln(cppc)2(H2O)2]n (where: Ln=Ce (1), Pr (2), Nd (3), Sm (4), Eu (5), Gd (6), Tb (7), Dy (8), Ho (9) and Er (10); and H2cppc=5-(4-carboxyphenyl)-2-pyridinecarboxylic acid). The H2cppc ligand was formed in situ via decarboxylation of the initial H3cppdc ligand under the hydrothermal reaction conditions. Complexes 1-10 that crystallized in the same C2/c space group, exhibited similar 2D layered structures and assemble into 3D supramolecular networks via hydrogen bonding and π-π stacking interactions. In addition, the luminescence properties of complexes 4, 5, 7 and 8 were investigated. [ABSTRACT FROM AUTHOR]

[Display omitted] • Four CPs (Co, Mn, Zn, Cd) based on mixed ligands were prepared and characterized. • 1 , 3 and 4 display 1D chains whereas 2 shows a 2D layer structure. • Magnetic susceptibility of 1 and 2 and luminescence of 3 and 4 have been investigated. Four novel mononuclear coordination polymers [Co(tmba)(phen)(H 2 O) 0.5 ] n (1), [Mn(tmba)(phen)] n (2), [Zn(tmba)(phen)] n (3) and [Cd(tmba)(phen)(H 2 O)] n (4), H 2 tmba = 4,4′-thiobis(methylene)bibenzoic acid, phen = 1,10-phenanthroline, were synthesized under hydrothermal conditions and characterized by single crystal X-ray diffraction, powder X-ray diffraction, infrared spectroscopy, and thermogravimetric analysis. Single crystal X-ray diffraction showed that compounds 1 , 3 and 4 build 1D chains whereas complex 2 displays a 2D layer configuration. Magnetic susceptibility measurements indicate that compound 1 exhibits the coexistence of spin–orbit coupling and antiferromagnetic interaction in the binuclear Co(II) center. Compound 2 manifests an antiferromagnetic interaction within the Mn(II)-carboxyl chain. Moreover, based on the solid state emission spectra of compounds 3 and 4 , and of H 2 tmba and phen, relevant fluorescence properties have been investigated. [ABSTRACT FROM AUTHOR]

Abstract: Two novel coordination polymers [Cd(BTC)1/2(H2O)3]·H2O (1) and [SmCu2K(BTC)2(H2O)4]·2H2O (2) (H4BTC=1,2,3,4-butanetetracarboxylic acid) have been synthesized at room temperature. Single-crystal X-ray diffraction analysis has revealed that 1 forms a two-dimensional network, while 2 forms a heterometallic three-dimensional framework. Furthermore, the luminescence properties of 2 have been studied. [Copyright &y& Elsevier]

Abstract: Three new one-dimensional (1-D) chain metal–nitroxide complexes of the formula [M(NIT4Py)2(e,e-trans-1,4-chdc)(H2O)2] n (M=Co(II) 1, Ni(II) 2 and Zn(II) 3; NIT4Py=2-(4′-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide and 1,4-chdc=1,4-cyclohexanedicarboxylate dianion) have been synthesized and characterized structurally as well as magnetically. The X-ray crystal structure analyses of complexes 1, 2 and 3 reveal that they are isostructural. Three complexes all crystallize in neutral 1-D chains where metal–nitroxide units [M(NIT4Py)2(H2O)2] are linked by the linear 1,4-cyclohexanedicarboxylate dianion. The 1,4-chdc completes the segregation and only possesses the e,e-trans-conformation, although there are both cis- and trans-isomers in the raw material. The magnetic measurements show that complexes 1 and 2 both exhibit weak antiferromagnetic interactions between the metal ions and the nitroxides. [Copyright &y& Elsevier]

Abstract: Two heterometallic coordination polymers, {KBa(ptc)(H2O)2}n(1) and {KCaEr(ptc)2(H2O)}n(2) (H3ptc=pyridine-2,4,6-tricarboxylic acid) have been synthesized under hydrothermal conditions and characterized by elemental analysis, IR and single crystal X-ray diffraction. 1 and 2 exhibit two novel three-dimensional (3D) frameworks, and the luminescence properties of 1, 2 were investigated. [Copyright &y& Elsevier]

Abstract: Heterometallic coordination polymers of the form {[SmMn2(imdc)2(OAc)(H2O)]·2H2O} n (1) (H3imdc=4,5-imidazoledicarboxylic acid, HOAc=acetic acid) were hydrothermally synthesized and characterized by elemental analysis, IR, and single-crystal X-ray diffraction. The results reveal that 1 has a three-dimensional framework containing Sm2Mn4 clusters. The luminescence and magnetic properties of 1 were also investigated. [Copyright &y& Elsevier]

[Display omitted] • Five Ln-CPs [Ln(BCBI)(NO 3) 2 H 2 O] n based on a benzimidazole zwitterion (HBCBI) were prepared. • Complexes 1 , 2 , 4 and 5 show luminescence of the trivalent lanthanides. • HBCBI ligand can act as effective antennae for photosensitization of Ln3+ ions. A series of novel lanthanide coordination polymers (Ln-CPs) were herein prepared from lanthanide salts and a zwitterionic common ligand, under hydrothermal conditions. These cationic Ln homometallic frameworks with two-dimensional architectures, designated as [Ln(BCBI)(NO 3) 2 (H 2 O)] n , where Ln = Sm (1), Eu (2), Gd (3), Tb (4), Dy (5), and HBCBI = 1,3-bis(carboxymethyl)benzimidazole zwitterion, have been characterized by X-ray single-crystal diffraction, infrared spectroscopy, elemental and thermogravimetric analyses. Due to the 4f n -4f n transition, complexes 1 , 2 , 4 and 5 show the luminescence characteristic for trivalent lanthanides. Moreover, the fluorescence lifetime of 2 and the phosphorescence spectrum of 5 at 77 K have been investigated. The relationships between the lowest triplet state energy level of the HBCBI ligand and the lowest resonance energy levels of the Sm3+, Eu3+, Tb3+ and Dy3+ ions were examined. The results showed that the energy transfer from the HBCBI ligand is effective. The structural impact of the ligand is also highlighted. [ABSTRACT FROM AUTHOR]

• Nine lanthanide CPs with 1,3-bis(carboxymethyl) imidazolium were prepared. • 3D framework (1 – 3) and 2D layer (4 – 9) were formed, respectively. • 3 , 4 , 6 and 7 show luminescence of the trivalent lanthanides. Nine lanthanide coordination polymers based on 1,3-bis(carboxymethyl) imidazolium (HBCI), [Ln(μ 3 -BCI)(NO 3) 2 H 2 O] n (Ln = Pr (1), Nd (2), Sm (3)) and [Ln(μ 4 -BCI)(NO 3) 2 H 2 O] n (Ln = Eu (4), Gd (5), Tb (6), Dy (7), Ho (8), Er (9)), were synthesized under hydrothermal conditions and characterized by elemental analysis, IR spectroscopy, PXRD analysis, thermogravimetry analysis and single-crystal X-ray diffraction. Crystal structures of the complexes 1 – 3 show a three-dimensional framework and those of 4 – 9 exhibit a two-dimensional layer, due to the various linking modes of HBCI. Complexes 3 , 4 , 6 and 7 show luminescence of the trivalent lanthanides. The fluorescence lifetime and quantum efficiency of 4 as well as the phosphorescence spectrum of 5 were measured. [ABSTRACT FROM AUTHOR]

The 1,3-bis(carboxymethyl)imidazolium salt (zwitterion) (HBCI) was reacted, under solvothermal conditions, with rare earth chlorides to provide a series of new two-dimensional (2D) coordination polymers, namely [LnBCI) (HCOO) (H 2 O) 2 Cl] n [Ln = Sm (1); Eu (2); Gd (3); Tb (4); Dy (5)]. The complexes were characterized by X-ray single crystal diffraction, powder X-ray diffraction, infrared spectroscopy, elemental analysis and thermogravimetric analysis. Compounds of 1 , 2 , 4 and 5 exhibit the characteristic luminescence of the corresponding lanthanide ions, due to the 4fn-4fn transition. Furthermore, the fluorescence lifetime of 2 and the phosphorescence spectrum of 5 at 77k are discussed. Five 2D coordination polymers, namely [LnBCI) (HCOO) (H 2 O) 2 Cl] n [Ln = Sm (1); Eu (2); Gd (3); Tb (4); Dy (5)] [HBCI = 1,3-bis(carboxymethyl)imidazolium salt] were prepared and structurally characterized. Luminescence properties of 1 , 2 , 4 and 5 , fluorescence lifetime of 2 and the phosphorescence spectrum of 5 are discussed. Image 1 • Five 2D CPs [LnBCI) (HCOO) (H 2 O) 2 Cl] n were prepared and characterized. • 1,3-Bis(carboxymethyl)imidazolium salt (zwitterion) (HBCI) was used as organic linker. • Compounds 1 , 2 , 4 and 5 show luminescence of the trivalent lanthanides. • The energy transfer processes of the Ln CPs were investigated. [ABSTRACT FROM AUTHOR]