Effect of pH/Auxiliary Ligand on the Structures of Coordination Compounds Based on a Novel Ligand 2,6-Bis(pyrazin-2-yl)pyridine-4-carboxylate

Four new coordination compounds, [Zn(bppc)_2(H_2O)_2]·3 H_2O(1), [Zn2(bppc)2(mbdc)(H_2O)4]·7 H_2O(2), [Zn(bppc)2(H_2O)2]n·n(m-Hbdc)·n(H_2O)(3), [Zn2(bppc)(btc)(H_2O)3]n·5 n H_2O(4)(Hbppc = 2,6-bis(pyrazin-2-yl)pyridine-4-carboxylate, H2(m-bdc) = 1,3-benzenedicarboxylic acid, H3 btc = 1,3,5-benzene-tricarboxylic acid), have been hydrothermally synthesized and structurally characterized. Compound 1 shows a mononuclear structure and 2 shows a dinuclear structure. Compound 3 is a one-dimensional chain structure, which is extended into a 3D supramolecular network by intermolecular hydrogen interactions. In 4, a 1D loop-like chain is connected by(btc)3-anions to generate a 2D layer structure. The structure differences of 1~4 show that the p H and aromatic acid as auxiliary ligand have important influence on the final structures.iAdditionally, the luminescent properties of 1~4 have been investigated with fluorescent spectra in the solid state, and 1~4 display a strong fluorescent emission at room temperature and have potential applications as fluorescent-emitting materials.     

Structure and Photophysical Properties of a Chiral 4-Fold Interpenetrated Zn(Ⅱ) Coordination Polymer Tuned by 4,4'-(Hexafluoroisopropylidene)bis(benzoic acid) and 1,3-Di(pyridineyl)benzene

A new three-dimensional(3D) chiral metal-organic coordination polymer, [Zn(dpb)(hfipbb)]n, was obtained under hydrothermal conditions by 1,3-di(pyridineyl)benzene(dpb) and 4,4?-(Hexafluoroisopropylidene)bis(benzoic acid)(H_2hfipbb). The as-prepared sample was characterized by single-crystal X-ray diffraction, PXRD, elemental analysis, IR spectroscopy and TGA analysis. The title coordination polymer crystallizes in orthorhombic, space group P21212, with a=21.923(4), b=23.594(4), c=7.3042(13) ?, V=3778.1(12) ?~3, Dc=1.209 g/cm~3, Mr=687.90, F(000)=1328, μ=0.713 mm~(-1) and Z=4. The compound contains two types of helical chains [Zn(hfipbb)]n and [Zn(dpb)]n which are linked with each other to generate a 3D framework by sharing the same Zn(Ⅱ) cations. It displays a 4-fold interpenetrated 3D framework. In addition, the luminescence, fluorescence lifetime and the second harmonic generation(SHG) efficiency properties in the solid state have been studied.     

Organic Carboxylate Ligand Tuned Topological Variations in Three Zn(Ⅱ) Coordination Polymers: Syntheses,Crystal Structures and Photoluminescent Properties

Three new Zn(Ⅱ) coordination polymers, namely [Zn_2(suc)_2(bib)_2]_n·nH_2 O(1), [Zn(glu)(bib)]_n·4 nH_2 O(2), and [Zn(adp)(bib)]n(3)(bib = 1,4-bis(N-imidazolyl)butane, H_2 suc = succinic acid, H_2 glu = glutaric acid, H_2 adp = adipic acid) have been hydrothermally synthesized and structurally characterized. Compound 1 features a 3D framework with 4-connected hxg-d topological network, compound 2 is comprised of 2D 4~4-sql-type sheets, and the adjacent 2D sheets are further packed into a 3D supramolecular architecture via intermolecular hydrogenbonding interactions, and compound 3 is a 3D framework with 4-fold interpenetrating dia topology. The structural comparison of these three compounds demonstrates that the topological variations can be well controlled by employing aliphatic dicarboxylate ligands with different spacer lengths. Moreover, the thermal stabilities and photoluminescent properties of them were also studied in detail.     

Three Novel Luminescent Zinc(Ⅱ) Compounds Constructed by Employing Mixed-ligand Strategy

Three novel coordination polymers,[Zn(suc)(o-bix)]_n (1),[Zn(suc)(m-bix)·H_2O]_n (2) and[Zn_2(suc)_2(p-bix)_2·4H_2O]_n (3)(H_2suc=succinic acid,o-bix=1,2-bis(imidazol-1-ylmethyl)-benzene,m-bix=1,3-bis(imidazol-1-ylmethyl)-benzene,p-bix=1,4-bis(imidazol-1-ylmethyl)-benzene),have been synthesized and structurally characterized by elemental analysis,IR spectroscopy,thermogravimetric analysis,powder X-ray diffraction,and single-crystal X-ray diffraction.These three coordination polymers present various structures originated from auxiliary N-donor ligands with different configurations.Compound 1 shows a 2D network with4~4-sql topology.Compound 2 exhibits an infinite chain,and the adjacent chains are extended into a 2D sheet byπ-πstacking interactions.Changing the conformation of the N-donor ligand leads to 3 featuring a 3D framework with a novel 4-connected (6~5·8) topology.In addition,the solid-state photoluminescent properties of compounds 1～3 are investigated.     

Two Coordination Polymers Based on Pamoic Acid and(1,4-Bis(imidazol-1-yl)-butane: Synthesis,Structures and Properties

Two mixed-ligand compounds,namely[Mn_2(bimb)(PA)_2]_n (1) and[Zn(bimb)(PA)]_n (2)(H_2PA=pamoic acid,bimb=1,4-bis(imidazol-1-yl)-butane) have been synthesized under the same solvothermal conditions.Compound 1 can be described as (4,4) topology based on the 4-connected[Mn_2(COO)_4]paddle-wheel units,which contains both rotaxane-and catenane-like motifs.For 2,the 2D wavy-like network interlocked with each other and resulted in a 2-fold interpenetrated 2D→3D architecture.The structural differences of the two compounds are mainly due to the differences of metal ions and coordination modes of the PA~(2-)ligand.In addition,the magnetism and photoluminescent properties of them have also been explored.     

Two Novel Coordination Polymers with(6,3) Topology Constructed by an Imidazole-containing Isophthalic Ligand:Syntheses,Structures and Luminescence Properties

Two novel coordination polymers,[Zn(ImNIPA)(DMSO)]n(1)and[Cd(ImNIPA)(DMSO)]n(2)(H2ImNIPA=5-(6-(1H-imidazol-1-yl)-1,3-dioxo-1H-benzo[de]iso-quinolin-2(3H)-yl)isophthalic acid,DMSO=dimethylsulfoxide),were prepared under solvothermal conditions through the reactions of Zn^2+/Cd^2+ and a new imidazole-containing isophthalic ligand H2ImNIPA.The compounds were fully characterized by elemental analysis,FT-IR spectroscopy,powder X-ray diffraction analysis and X-ray single-crystal diffraction analysis.Both 1 and 2 are two-dimensional(2D)coordination layers via the combination of 3-connected metal nodes and ImNIPA^2- linker,featuring(6,3)honeycomb-type topology.In addition,the 2D layers in the two compounds are further extended into 3D supramolecular frameworks via π-π stacking interactions.Finally,the thermal-stability and solid-state luminescence properties of them were also investigated.     

Synthesis,Crystal Structure and Photoluminescent Property of a New Zn(Ⅱ) Complex Based on 3,4-Bis(2-pyridyl)-5-(4-pyridyl)-1,2,4-triazole

The coordination polymer[Zn_(1.5)(2,2?,4??-tpt)(tpa)_2]_n(2,2?,4??-tpt=3,4-bis(2-pyridyl)-5-(4-pyridyl)-1,2,4-triazole,H_2tpa=terephthalic acid)has been obtained by solution evaporation method and characterized by elemental analysis,IR,TG and single-crystal X-ray diffraction.The title compound crystallizes in the triclinic system,space group P1,with a=10.331(3),b=10.596(1),c=14.966(3)?,β=99.029(0)o,V=1448.86(6)?~3,Z=2,D_c=1.668g/cm~3,μ=1.320 mm~(-1),F(000)=740,R=0.0359 and w R=0.0841 with I2σ(I)).In this polymer,the asymmetric unit contains two crystallographically independent Zn(II)ions in different coordination environments.Zn(1)ion is five-coordinated,forming a distorted tetragonal pyramidal geometry,while the Zn(2)ion is six-coordinated to get a distorted octahedral geometry.Each Zn(II)ion is linked by 2,2?,4??-tpt and H_2tpa ligands,forming an infinite 2D structure.The existence of O(8)–H(8)···O(2)hydrogen bonding interactions leads the 2D chains to generate a 3D structure.In addition,1 shows strong photoluminescent emissions in the solid state at room temperature,so it can be used as potential optical materials.     

Synthesis, crystal structures and fluorescence properties of four mixed-ligands Zn(Ⅱ) and Cd(Ⅱ) coordination compounds

Four new coordination compounds, [Zn(dba)(bpy)]n (1), {[Zn(dba)(phen)]·2H2O}n (2), [Cd(dba)(bpy)(H2O)2] (3) and [Cd2(dba)2(phen)2]n (4) (H2dba = 2,5-dihydroxy-p-benzenediacetic acid, bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline) have been prepared via solvothermal method and characterized by sin-gle-crystal X-ray diffraction, infrared spectroscopy, elemental analysis and powder X-ray diffraction. 1 and 2 possess 1D infinite chain structures. Complex 3 exhibits a mononuclear structure. Complex 4 owns bi...     

A New 2D Zinc(Ⅱ) Coordination Polymer Constructed by Imidazole-4,5-dicarboxylic Acid(H_3IDC) and 1,4-Bis(imidazol-1-ylmethyl)-benzene(bix)

A new 2D Zn(Ⅱ) coordination polymer [Zn(HIDC)(bix)0.5]n(1) was obtained by the hydrothermal reaction of ZnCl2,imidazole-4,5-dicarboxylic acid(H3IDC) and 1,4-bis(imidazol-1-ylmethyl)-benzene(bix) with a 2:2:1 mole ratio.X-ray diffraction crystal structural analysis reveals it crystallizes in monoclinic,space group P21/n with a = 12.125(3),b = 10.541(3),c = 12.484(3) ,β = 115.834(4)°,V = 1436.0(6) 3,Mr = 338.60,Z = 4,Dc = 1.566 Mg·m-3,F(000) = 684,μ(MoKα) = 1.730 mm-1,the final R = 0.0439 and wR = 0.0888 for 2101 observed reflections with I ≥ 2σ(I).In 1,each zinc(Ⅱ) ion is five-coordinated with a slightly distorted trigonal bipy-ramidal coordination geometry,and each μ2-HIDC2-acts as a bridge to bond two neighboring Zn(Ⅱ) ions,leading to a 1D zigzag chain architecture.The adjacent zigzag chains are further linked by μ2-bix to form an infinite 2D network structure.The fluorescence spectrum of 1 exhibits intense emission at 466 nm when excited at 397 nm in solid state at room temperature.     

Structural Diversity and Luminescent Properties of Two Zinc(Ⅱ) Polymers Based on Semirigid N-heterocyclic Ligand

By varying the spacer angles of phenylenediacetic acid, two novel Zn(II) coordination polymers based on semirigid N-heterocyclic ligand 1,4-bis(2-ethylbenzimidazol-1-ylmethyl) benzene, [Zn(beb)0.5(m-phda)]n(1) and {[Zn(beb)(p-phda)]·2H2O}n(2), were synthesized and fully structurally characterized. Polymer 1 exhibits a 2D grid-layer with a 44 topology. Polymer 2 shows a 2D layer with rare meso-helix. In addition, the thermal stability and photoluminescence properties of polymers 1 and 2 have also been investigated.     

Syntheses,Structures and Characterizations of Two New Zinc(Ⅱ) Coordination Polymers Constructed from 3-(1H-Pyrazol-4-yl)-5-(pyridin-2-yl)-1,2,4-triazole and Different Carboxylate Ligands

Two new zinc(Ⅱ) coordination polymers, [Zn(ph)(H2 L)·H_2O]2 n(1) and [Zn(ip)(H2 L)-(H_2O)]n(2)(H2 ph = phthalic acid, H2 ip = isophthalic acid, H2L = 3-(1 H-pyrazol-4-yl)-5-(pyridin-2-yl)-1,2,4-triazole), have been successfully synthesized via hydrothermal reaction. It has been structurally characterized by X-ray single-crystal analysis, IR spectra, fluorescence spectroscopy and thermogravimetry analysis. The single-crystal X-ray diffraction studies reveal that compounds 1 and 2 both exhibit 1D chain structures, and assemble into 2D and 3D supermolecules through hydrogen bonds or π-π interactions. Moreover, the thermal stability and luminescent properties of compounds 1 and 2 were also studied.     

Syntheses,Crystal Structures and Luminescent Properties of Two New Zinc(Ⅱ) Complexes Based on Bifunctional Ligand

By using solvothermal method,two novel coordination polymers based on 4-(4-carboxyphen-yl)-1,2,4-triazole(Hcpt) and Zn(Ⅱ) cations,[Zn(cpt)(OH)]_n·n H_2O(FJU-32) and [Zn(cpt)(atrz)]n(FJU-33)(Hatrz = 3-amino-1,2,4-triazolate),were synthesized and characterized by single-crystal X-ray diffraction analyses,elemental analyses,FT-IR and powder X-ray diffraction. FJU-32 crystallizes in monoclinic,space group P21/c with a = 3.7441(3),b = 23.0384(19),c = 11.8562(10) ?,β = 99.069(8)o,V = 1009.91(15) ?3,Dc = 1.898 g/cm3,C_9H_9N_3O_4Zn,Mr = 288.57,F(000) = 916,μ(MoKα) = 2.439 mm~(-1),Z = 4,R = 0.0600 and wR = 0.1306 for 2412 observed reflections(I 2σ(I)),and R = 0.0704 and wR = 0.1349 for all data. FJU-33 crystallizes in monoclinic space group P21/c with a = 12.7483(5),b = 9.9922(3),c = 9.8403(3) ?,β = 100.756(4)°,V = 1231.47(7) ?~3,Dc = 1.816 g/cm~3,C_(11)H_9N_7O_2Zn,Mr = 336.62,F(000) = 680,μ(Cu Kα) = 2.957 mm~(-1),Z = 4,R = 0.0478 and w R = 0.1184 for 2466 observed reflections(I 2σ(I)),and R = 0.0687 and w R = 0.1309 for all data. In FJU-32,Zn(Ⅱ) is coordinated to three μ3-OH groups forming an unprecedented 1D zigzag-like double chain,and the 1D double chains are connected to four neighbouring double chains by the cpt ligands to form an extended 3D porous coordination polymer. In FJU-33,the adjacent [Zn(atrz)] 2D layers are further connected by the cpt ligands via Zn–O coordinated bonds and neighboring interlayer hydrogen-bonding interactions to give rise to an overall 3D pillared layer structure. The neutron triazole group of the cpt ligand has weaker coordination ability than the triazolate anion of atrz ligand. Furthermore,FJU-32 and FJU-33 display high thermal stability up to 300 ℃,and the solid state fluorescence reveals that two new complexes are potential optical materials.     

Syntheses,Structures, and Properties of Three Coordination Polymers: [Cd_2(bpp)_(1.5)(Hbpp)(phen)_2]_n, [Mn_3(Htptc)_2(phen)_2(H_2O)_2]_n,and {[Cu(btc)_(0.5)(1,4-bib)]·2H_2O}_n

Hydrothermal reactions of three aromatic polycarboxylic acids and the transitional metal cations in the presence of phen and 1,4-bib afford three new coordination polymers: [Cd2(bpp)1.5(Hbpp)(phen)2]n(1), [Mn3(Htptc)2(phen)2(H2O)2]n(2), and {[Cu(btc)0.5(1,4- bib)]·2H2O}n(3)(H2bpp = 2,6-bis(4'-carboxyphenyl)-4-phenylpyridine, H4tptc = terphenyl-2,5,2',5'-tetracarboxylic acid, H4btc = biphenyl-2,2',4,4'-tetracarboxylic acid, phen = 1,10-phenanthroline, and 1,4-bib = 1,4-bis(1H-imidazol-1-yl)benzene). Their structures have been determined by singlecrystal X-ray diffraction analyses, elemental analyses, IR spectra, and powder X-ray diffraction(PXRD) analyses. In compound 1, the CdII cations are linked by bpp2- to form one ladder structure, based on which a 3D network is constructed with the help of non-covalent interactions. The topology of 2 is a 3D(3,4,5)-connected framework with the Point Schl?fli symbol of(42.6)32(4.62.8)(45.64.8)2. Compound 3 shows an unprecedented 3D(4,4)-connected framework with the Point Schl?fli symbol of(64.82)2(65.8). Moreover, the luminescent property of 1 has been investigated.     

Two Coordination Polymers Constructed by Cd(Ⅱ) and Zn(Ⅱ) with in situ Generated 5-(3-Pyridyl)tetrazolate Ligand:Syntheses,Crystal Structures and Luminescence Properties

Hydrothermal reactions of 3-cyanopyridine and Na N3 with Zn Cl_2 or Cd Cl_2·5/2H_2 O in the presence of 1,4-benzenedicarboxylic acid(H2bdc) yielded two new coordination polymers,{[Zn(3-ptz)(bdc)_(0.5)(H_2O)_2]n·2H_2O}_n(1) and [Cd_2(3-ptz)_2Cl_2]_n(2),based on in situ synthesized 5-(3-pyridyl)tetrazolate(3-ptz-) organic ligand.They have been structurally characterized by elemental analysis(EA),infrared spectroscopy(IR) and single-crystal/powder X-ray diffraction(PXRD).In 1,two Zn(Ⅱ) ions are linked together through two μ_2-(3-ptz-) ligands to form a dimeric unit of [Zn(μ_2-3-ptz)(H_2O)_2]_2~(2+),which is further connected with other equivalent units by μ_2-bdc~(2-)spacers,resulting in an infinite 1D polymeric chain of [Zn_2(3-ptz)_2(H_2O)_2(bdc)]_n,and then strong hydrogen bonding interactions extend these 1D chains into a 3D supramolecular structure.In 2,the Cd(Ⅱ) ions are connected through μ_4-(3-ptz-) ligands and Cl-anions,leading to infinite 2D layers of [Cd_2(3-ptz)Cl_2]_n~(n+),which are further linked by another μ_4-(3-ptz-) pillared ligand to form a 3D layered-pillared framework architecture of [Cd)2(3-ptz))2Cl)2])n.Furthermore,thermal stability of these compounds was measured by thermogravimetric analysis(TGA) and their photoluminescent properties were also investigated in the solid state at room temperature.     

Two Zinc（Ⅱ） Carboxyarylphosphonates with Unusual Polynuclear Zn（Ⅱ） Units：Syntheses and Crystal Structures

[Zn2(PCP)(phen)(H2O)F]n 1 and {[Zn3(MCP)2(phen)2(H2O)]·2.5H2O}n 2(PCP = p-O2C(C6H4)PO33-,MCP = m-O2C(C6H4)PO33- and phen = phenanthroline) were obtained by hydrothermal synthesis and characterized by X-ray single-crystal diffraction.Compound 1 crystallizes in the monoclinic P21/c space group with a = 7.908(2),b = 20.254(3),c = 13.477(2) ,β = 107.76(3)°,V = 2055.7(8) 3,Z = 4,C20H16FN2O6PZn2,Mr = 561.10,Dc = 1.813 g/cm3,μ = 2.463 mm-1,F(000) = 1128,the final R = 0.0340 and wR = 0.0794.Compound 2 crystallizes in the monoclinic P21/n space group with a = 15.629(3),b = 18.141(4),c = 17.723(7) ,β = 121.89(2)°,V = 4267(2) 3,Z = 4,C40H31N4O13.5P2Zn3,Mr = 1041.70,Dc = 1.620 g/cm3,μ = 1.818 mm-1,F(000) = 2108,the final R = 0.0669 and wR = 0.1775.In compound 1,the tetranuclear Zn4 units are linked together by μ4-PCP3- to build 2D(4,4) layers,which are further interconnected through the μ2-bridging fluorion into a 3D framework with 1D phen ligands-filled channels.As for the 3D supramolecular framework of 2,the novel hexanuclear Zn6 units with "chair" conformation are extended by the moieties of μ4-MCP3- ligand to a 2D(4,4) layer on the bc plane,which is viewed as the 2-folded layers in 1.In both compounds,the structures are stabilized by hydrogen bonding interactions and π-π stacking interactions between the phen rings.Additionally,FT-IR spectroscopy and the fluorescent properties are discussed.     

Crystal Structures and Luminescent Properties of Three Coordination Polymers Based on 2,5-Furandicarboxylic Acid Ligand and 1,10-Phenanthroline

Three new coordination polymers,namely [Zn(FDA)(phen)(H_2O)·H_2O]_n(1),[Cd(HFDA)(phen)2(NO3)](2) and [Cd(FDA)(phen)]n(3)(H_2FDA = 2,5-furandicarboxylic acid,phen = 1,10-phenanthroline) have been synthesized by the solvothermal method and characterized by elemental analysis,IR,powder X-ray diffraction,thermogravimetric analysis and X-ray single-crystal diffraction analysis.For 1,the neighboring Zn~(2+) ions are bridged by FDA2-as linkers to form one-dimensional(1D) chains,and phen ligands are as the terminal ligands.Furthermore,the 1D chains are packed into a three-dimensional(3D) supramolecular structure through hydrogen bonds and π-π interactions.For 2,the H_2FDA ligand is partial deprotonation,which is a rare phenomenon among other coordination polymers based on H_2FDA.Under the synergetic effect of phen ligands and the partial deprotonation of H_2FDA,the structure of 2 is discrete.For 3,the Cd~(2+) ions are linked by two carboxylates of FDA2-ligand to give rise to 1 D zig-zag chains,and phen ligands chelate the Cd~(2+) ions like 1.In addition,solid-state luminescent spectra of three coordination polymers were also studied at room temperature.     

Syntheses,Structures,and Properties of Two New Coordination Polymers Based on Tetracarboxylate and 2,2′-Bipyridine Mixed Ligands

Two new coordination polymers {[Zn2L1(2,2'-bpy)2(H2O)2]·4H2O}n(1) and [Zn2L2(2,2'-bpy)2(H2O)2]n(2)(H4L1 = terphenyl-2,2',4,4'-tetracarboxylic acid, H4L2 = quarterphenyl-2,2',4,4'-tetracarboxylic acid, and 2,2'-bpy = 2,2'-bipyridine) have been synthesized and characterized by elemental analysis, IR and X-ray single-crystal diffraction studies. Complex 1 displays 2D wavelike networks, which are further joined together through O–H···O hydrogen bonds to give a 3D supramolecular network. Complex 2 exhibits 1D ladder-like chains, and they are further joined together by π-π stacking and O–H···O hydrogen bonding interactions to form a 3D supramolecular network. The results indicate that the backbone of carboxylate ligands has significant effects on the formation and structure of the resulting functional coordination polymers. Additionally, thermal stability and photoluminescent properties of 1 and 2 are also investigated in detail.     

Highly selective recognition of adenosine 5′-triphosphate against other nucleosides triphosphate with a luminescent metal-organic framework of [Zn（BDC）（H2O）2]n（BDC = 1,4-benzenedicarboxylate）

Selective recognition of adenosine 5′-triphosphate(ATP)is of great significance owing to its indispensable functions to organisms.Also,it is a challenging task because other nucleosides triphosphate hold the same triphosphate group and structurally planar bases as ATP.It is known that metal-organic frameworks(MOFs)are a new type of sensing material.In this work,highly selective recognition of ATP against other nucleosides triphosphate is successfully achieved with a luminescent MOF of[Zn(BDC)(H2O)2]n(BDC2=1,4-benzenedicarboxylate).[Zn(BDC)(H2O)2]n dispersed in water shows a remarkable redshift of the emission wavelength upon addition of ATP,while cytidine 5′-triphosphate(CTP),uridine 5′-triphosphate(UTP),and guanosine 5′-triphosphate(GTP),as well as some inorganic anions such as P2O74 or PO43 can’t induce such spectral change as ATP.1H NMR,31P NMR and Raman spectra indicate that both-stacking interactions and the coordination of Zn(II)with adenine and the phosphate group are involved in the interaction of[Zn(BDC)(H2O)2]n with ATP.In addition,the experimental results showed that the redshift extent of the emission wavelength of[Zn(BDC)(H2O)2]n has the linear relationship with the concentration of ATP in the range of 0.3–1.8 mmol/L.Based on this,the detection of ATP content in the sample of ATP injection was made with satisfactory results.This system pioneers the application of MOFs in the recognition of nucleotides,and testifies that the participation of base in the recognition process can improve the selectivity against the other nucleotides.     

A Novel 3D Zn-La Heterometallic Coordination Polymer Involving in situ Glycinate Ligand Synthesis

One novel 3D 3d-4f coordination polymer, [LaZn(glc)(ox)2(H2O)2]n (1, glc = glycinate, ox = oxalate), was obtained by the in situ synthesis of glycinate from the reaction of tetrazole-1-acetic acid, sodium oxalate, zinc nitrate and lanthanide oxide in the presence of a trace quantity of nitric acid under hydrothermal conditions. Compound 1 is of monoclinic, space group P21/n with a = 0.99601(9), b = 1.14592(10), c = 1.19107(10) nm and β = 108.7150(10)°. 1 exhibits an unusual 3D heterometallic coordination framework constructed by heterometallic dinuclear LaZn subunits and mixed ox and glc linkers with a uninodal 6-connected vme {33 .43 .58 .6} net.     

Syntheses,Structures,and Photoluminescent Properties of Two Zn(Ⅱ) Coordination Polymers with Helical Chains Structures

Two novel coordination polymers with helical chains, {[Zn(L)(H2O)]?H2O}n(1) and {[Zn(L)(p-bix)]?3.5H2O}n(2), where H2 L = 5-(4-hydroxypyridinium-1-ylmethyl) isophthalic acid and p-bix = 1,4-bis(imidazol-1-ylmethyl)benzene, have been hydrothermally synthesized, and charac-terized by elemental analysis, powder X-ray diffraction(PXRD), IR, thermal gravimetric analyses(TGA) and also by single-crystal X-ray diffraction. Both complexes 1 and 2 crystallize inmonoclinic, space group P21/c. Compound 1 displays a two-dimensional(2D) structure with two distinct types of helical chains; 2 shows a layered coordination polymer with two types of helical chains and features an interesting 2D→3D interdigitated architecture. Meanwhile, the luminescent properties of 1 and 2 have also been investigated in detail.