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By employing two types of hydrothermal in situ ligand reactions (acylation of N2H4 with aromatic polycarboxylic acids, reduction of 3-nitrophthalhydrazide by N2H4), three new acylhydrazidate-extended Zn2+ coordination polymers [Zn2(3-apth)(atrz)2] (3-apth = 3-aminophthalhydrazidate; atrz = 3-amino-1,2,4-triazolate) 1, [Zn2(4-apth)(atez)2] (4-apth = 4-aminophthalhydrazidate; atez = 5-aminotetrazolate) 2, and [Zn(3-cppth)(H2O)] (3-cppth = 4-(3-carboxyphenoxy)phthalhydrazidate) 3 were obtained. X-ray single-crystal diffraction analysis revealed that (i) compound 1 possesses a 3-D structure. The triazolate molecules link the Zn2+ ions to form a 2-D layer with a (6,3) topology. Then the acylhydrazidate molecule acts as the second linker, extending the (6,3) nets into a 3-D network of compound 1; (ii) compound 2 also exhibits a 3-D structure. The acylhydrazidate molecules first link the Zn2+ ions into a 1-D infinite chain. The tetrazolate molecules propagate further the chains into a 3-D (4,4)-connected net (symbol: (4·64·8)2(4²·6²·8²)); (iii) compound 3 only shows a 1-D chain structure. The photoluminescence analysis indicates that the three title compounds all emit light, especially compound 2 which emits extremely strong blue light. The side group on the phthalhydrazidate molecule plays a crucial role in the emission behaviors of compounds 1-3. At 77 K, the activated compound 2 can adsorb N2 with a capacity of ca. 41.0 cm³ g-1. [ABSTRACT FROM AUTHOR]

Under hydrothermal conditions, the reactions of Ba2+/Zn2+, aromatic polycarboxylic acids and N2H4 with or without oxalic acid were carried out, affording four new acylhydrazidate-extended metal-organic frameworks (MOFs) [Ba(pmdh)] (pmdh = pyromellitdihydrazidate) 1, [Ba(sdpth)(H2O)2]·0.5H2O (sdpth = 4,4'-sulfoyldiphthalhydrazidate) 2, [Ba2(cpth)2(H2O)2] (cpth = 4-carboxylphthalhydrazidate) 3 and [Zn2(pdh)2(ox)]·H2O (ox = oxalate, pdh = pyridine-2,3-dicarboxylhydrazidate) 4. The acylhydrazidate molecules pmdh, sdpth, cpth and pdh in compounds 1-4 derived from the hydrothermal in situ acylation of N2H4 with aromatic polycarboxylic acids. X-ray single-crystal diffraction analysis revealed that (i) in compound 1, the pmdh I molecules link the Ba2+ ions into a two-dimensional (2D) layer with a (4,4) topology, and then the pmdh II molecules extend these layers into a three-dimensional (3D) network; (ii) in compound 2, the sdpth molecules link the Ba2+ ions to form a one-dimensional (1D) square tube. Interestingly, the tubes are further linked into a 3D supramolecular network via the N-H┄O interactions, creating synchronously big channels; (iii) in compound 3, the cpth I molecules link the Ba1 ions into a 3D network with a (10,3) topology. Ba2 and cpth II are distributed on the channels; (iv) in compound 4, Zn2+ and pdh aggregate to form two types of Zn4(pdh)4 clusters. The ox molecules act as the secondary linkers, extending the Zn4(pdh)4 secondary building units (SBUs) into a 3D network with a 66 topology. The photoluminescence analysis indicates that compounds 3 and 4 emit green light with maxima at 495 nm for 3 (λex = 397 nm), and 522 nm for 4 (λex = 395 nm), respectively. At 77 K, the activated 2 and 4 can adsorb N2 in amounts of 58.31 cm³ g-1 for 2 and 38.38 cm3 g-1 for 4, respectively. [ABSTRACT FROM AUTHOR]

In an acidic solution, the room-temperature reactions of CdX2 (X- = Cl-, Br- or CH3COO-) and organic N-heterocyclic molecules with or without SCN-/SeCN-/dca- (dca- = dicyanamide) created the five new hybrid Cd(II) compounds [H2(4,4'-dtdpy)]2[CdBr4]SO4.2.5H2O (dtdpy = dithiodipyridine) 1, [H(2,2'-dtdpy)]2- [CdBr4] 2, [(Hbim)2CdCl2(SCN)2] (bim = 2,2'-biimidazole) 3, [H2(pip)][Cd(SCN)4] (pip = piperazine) 4 and [CdL2] (L = HNC(OH)N-CN) 5. X-ray single-crystal diffraction analysis revealed that: (i) compound 1 is a double salt of [H2(4,4'-dtdpy)]SO4 and [H2(4,4'-dtdpy)][CdBr4], [H2(4,4'-dtdpy)]SO4 shows a two-dimensional (2D) supramolecular layer structure and [H2(4,4'-dtdpy)][CdBr4] is distributed in the space between the supramolecular layers; (ii) compounds 2 and 3 are mononuclear molecular entities. Of those, 2,2'- dtdpy and bim were only in situ monoprotonated; (iii) compound 4 contains a 2D supramolecular layered structure which is based on [Cd(SCN)4]2- chains with H2(pip)2+ via NSCN-Npip interactions; (iv) the threedimensional (3D) compound 5 exhibits a rutile-related (4.62)2(42.610.83)-topology. The ligand L originates from the in situ nucleophilic addition of H2O with one -CN group of dca-. Upon excitation, the solidstate compounds 3 and 4 emit blue light, and the solid-state compound 5 emits violet light. [ABSTRACT FROM AUTHOR]

Under hydrothermal conditions, at different pH levels adjusted by H2ox (ox = oxalate, C2O4 2-) or N2H4, the reactions of Zn(CH3COO)2.2H2O, phthalic/3-nitrophthalic acid, N2H4.H2O and triazole/tetrazole afforded four new Zn2+ coordination polymers as [Zn5(OH)2(Hpth)2(pth)2(trz)2] (pth = phthalhydrazidate, trz = 1,2,4-triazolate) 1, [Zn3(OH)2(Hpth)2(datrz)2] (datrz = 3,5-diamino-1,2,4-triazolate) 2, [Zn2(pth)(atez)2] (atez = 5-aminotetrazolate) 3 and [Zn5(OH)2(ox)(apth)2(datrz)2] (apth = 3-aminophthalhydrazidate) 4. The acylhydrazide molecules H2pth and H2apth in compounds 1-4 originated from the hydrothermal in situ acylation of N2H4 with phthalic/3-nitrophthalic acid. When preparing compound 4, the reduction of -NO2 into -NH2 also occurred besides the acylation, creating finally a new acylhydrazide molecule H2apth. The X-ray single-crystal diffraction analysis revealed that (i) in compounds 1, 3 and 4, Zn2+ and pth/apth aggregate into the 1D endless chains. The triazolate/tetrazolate molecules extend the Zn2+-pth/apth chains into the different layer networks of compounds 1 and 4, and a 3D network of compound 3; (ii) in compound 2, the datrz molecules link the Zn2+ ions into a 2D layer network. Pth acts as the ancillary ligand; (iii) ox from H2ox was introduced into the final framework of compound 4; (iv) the acylhydrazide molecules exhibit three types of existing forms in compounds 1-4: the diketo form, the keto-hydroxyl form, and the dihydroxyl form. Of those, the dihydroxyl form was observed for the first time. The solidstate photoluminescence analysis indicated that only compound 4 emits green light, and the others do not emit light. [ABSTRACT FROM AUTHOR]

Three new arsenic-vanadium compounds, [As8V14O42(H2O)][Cu(2,2'-bpy)2]4 (1) [As8V14O42(H2O)][Cu(1,10-Phen)2]4 (2) and [As8V14O42(H2O)][Ni(Biim)3]2.6H2O (3) (2,2'-bpy = 2,2'-bipyridine, 1,10-Phen = 1,10-phenanthroline and Biim = 2,2'-biimidazole), have been prepared hydrothermally and characterized by IR, UV-Vis, XRD, XPS, and single-crystal X-ray diffraction analyses. X-ray crystallographic studies showed that compounds 1-3 are all based on the cluster anion [As8V14O42(H2O)]4-. However, the crystal structures of the three are thoroughly different. It is obvious that the transition metal complex building blocks are the vital factor for the packing structures of the three. We carefully discussed the influence of transition metal complex building blocks on the crystal structures. Also we analyzed the catalytic properties of the compounds and discussed the influence of the crystal structures of transition metal complexes on the catalytic properties. [ABSTRACT FROM AUTHOR]

Six new hybrid compounds based on polyoxometalates and transition metal complexes, [SiW12O40][Ag4(2,2'-bpy)4(4,4'-bpy)3]·2H2O (1), [SiMo12O40][Cu(2,2'-bpy)(H4,4'-bpy)2(H2O)][H4,4-bpy] (2), [PMo12V2O42][Cd2(Phen)2(4,4'-bpy)2(H2O)2(C2O4)]·2H2O (3), [PMo12V2O42][Cu2(4,4'-bpy)2][Cu2(Phen)(4,4'-bpy)2]·3H2O (4), [SiMo12V2O42][Cu2(Phen)2(4,4'-bpy)]2 (5) and [GeMo12V2O42][Cu2(Phen)2(4,4'-bpy)]2 (6) (bpy = bipyridine, Phen = phenanthroline), have been synthesized and characterized. Compound 1 contains a discrete tetranuclear silver-2,2'-bpy-4,4'-bpy complex; compound 2 is the first example where the polyoxometalate supports a metal-aqua-2,2'-bpy-4,4'-bpy complex; it should be noted that the complex contains a 2,2'-bpy and two 4,4'-bpy ligands; compound 3 is the first hybrid compound based on polyoxometalates and metal- aqua-4,4'-bpy-oxalic-phenanthroline complexes; and compound 4 is a novel hybrid compound based on polyoxometalates, extended metal-4,4'-bpy complexes and extended metal-4,4'-bpy-phenanthroline complexes together. Compounds 5 and 6 are isomorphous and isostructural; both exhibit a supramolecular structure constructed from bicapped Keggin POMs and metal-4,4'-bpy-phenanthroline complexes. [ABSTRACT FROM AUTHOR]

A series of metal–organic complexes based on d10metals and the ligand H4bbh (H4bbh = benzene-1, 2, 4, 5-biformhydrazide), formed through hydrothermal in situacylate reaction of H4bta (H4bta = benzene-1, 2, 4, 5-tetracarboxylic acid) with hydrazine hydrate (N2H4·H2O), have been prepared and structurally characterized by single-crystal X-ray diffraction. Compounds [Zn(μ2-H2bbh)(phen)(H2O)]2(1) (phen = 1, 10-phenanthroline) and [Zn(μ2-H2bbh)(2, 2′-bpy)]2(2) (2, 2′-bpy = 2, 2′-bipyridine) are both dinuclear complexes in which bridging ligands H2bbh2−display different μ2- coordination modes. [Zn(μ2-H2bbh)1/2(μ2-H2bbh)1/2(H2O)]n(3) exhibits a two-dimensional (2-D) layer structure containing simultaneously two kinds of different coordination modes of H2bbh2−: μ2-bidentate and μ4-tetradentate. [Cd(μ3-H2bbh)(phen)]n(4) consists of one-dimensional (1-D) double-metal chains. The crystal structures of these compounds are stabilized by hydrogen bonds and ππ interactions, forming three-dimensional supramolecular networks. All of the compounds were characterized by IR, UV-vis spectra and elemental analysis and they show good fluorescence properties in the solid state at room temperature. In order to understand the emission mechanism, we carried out TDDFT calculations on the excited electronic states of compound 2. [ABSTRACT FROM AUTHOR]

Five novel heteropolyanions have been synthesized and characterized by IR, UV-vis, XPS spectroscopy, XRD, and elemental analyses. Single-crystal X-ray diffraction analyses reveal that these five compounds represent novel examples of compounds based on the combination of polyoxometalates, transition metal coordination complexes and organic amines. Of which 1, 2and 3exhibit 0D structures of polyoxometalate supported transition metal coordination complexes, while 4and 5exhibit novel 1D structures constructed from polyoxometalates and transition metal coordination complexes. [ABSTRACT FROM AUTHOR]

The hydrothermal in situself-assembly of Pb2+, benzene-1,2,4-tricarboxylic acid (BTCA) and N2H4·H2O created two Pb(ii) coordination polymers containing 4-carboxylphthalhydrazidate (CPTH), [Pb(CPTH)(phen)] (phen = 1,10-phenanthroline) 1and [Pb4(OH)2(H2O)3(CPTH)3]·2H2O 2. CPTH is derived from the in situacylation reaction of BTCA with N2H4·H2O. [ABSTRACT FROM AUTHOR]

Two new compounds based on AsIII–VIVpolyoxometalates, [HAs6V15O42(H2O)][Cu(enMe)2]2.5·2H2O (1), [H2enMe]2[As8V14O42(H2O)]·3H2O (2), have been hydrothermally synthesized and characterized by IR, UV-vis, ESR, XPS spectra, elemental analyses, magnetic susceptibility studies and single-crystal X-ray diffraction analyses, respectively. X-Ray crystallographic studies reveal that 1represents the first example of 2D structure constructed from [HAs6V15O42(H2O)]5−anions and transition metal coordination complexes, in addition, it exhibits the first brick-wall-like 2D layer structure constructed from polyoxometalates and transition metal coordination complexes. 2exhibits a very interesting stacking mode. The study of magnetic susceptibilities demonstrates the presence of antiferromagnetic interactions in both 1and 2. [ABSTRACT FROM AUTHOR]

With Cu6I6and Cu8I8clusters as 5-connected nodes, a new 3-D network [Cu14I14(dabco)5(py)] (1) (dabco = 1,4-diazabicyclo[2.2.2]octane, py = pyridine) with a two-fold interpenetrated sqp-(44.66) topology has been hydrothermally synthesized. The solid-state luminescence spectrum displays a strong yellow-light emission with λmax= 591 nm at room temperature. [ABSTRACT FROM AUTHOR]

A series of lanthanide complexes with mixed polycarboxylate ligands, [Ln2(op)2(ox)(H2O)4]n·nH2O (Ln = Ce, Pr, Nd, Sm, Eu and Gd for 1–6, respectively), [KLn(pma)1/2(ox)(H2O)]n(Ln = Tb (7) and Dy (8)), [KLn2(mp)3(ox)1/2(H2O)3]n(Ln = Ce(9) and Pr(10)) (op = o-phthalate, ox = oxalate, pma = pyromellitate and mp = m-phthalate), have been prepared, and their photoluminescent properties have been investigated. Compounds 1–6show (3,4)-connected 2D network structures consisting of {Ln(op)}nstaircase chains bridged by ox ligands. Compounds 7and 8consist of 1D zigzag {Dy(ox)}nchains linked by pma ligands adopting a new μ4-hexadentate coordination mode to form 2D 6-connected networks with (36·46·53) topology. Through KO interactions, the 2D networks are further connected to construct 3D structures. Compounds 9and 10display inorganic–organic 3D topology networks with the Schläfli symbol (3·43·52)(32·410·59·614·7)(42·5) containing mixed (3,4,9)-connected nodes. [ABSTRACT FROM AUTHOR]

A series of hydrothermal reactions of metallic salts (CoCl2, CdSO4and ZnCl2), carboxylates (oxalic acid and 1,4-H2BDC) and organic amines (o-PD, Him) have been investigated. Five coordination complexes, [Zn2(bim)4]n(1), Cd(H2bbim)2SO4·1/3(H2O) (2), [Co2(H2bbim)4(bbim)]Cl2(3), [Co(Hbim)(Him)(C2O4)]n(4) and [Zn(H2bbim)(1,4-BDC)]n(5) (o-PD = o-phenylenediamine, Hbim = benzimidazole, H2bbim = 2,2′-bisbenzimidazole, Him = imidazole, 1,4-H2BDC = 1,4-benzenedicarboxylic acid), were prepared and characterized by elemental analyses, IR, single-crystal X-ray diffraction, fluorescence and magnetic analyses. Interestingly, two different ligands Hbim and H2bbim were generated viahydrothermal in situreactions of o-PD and oxalic acid during the formation processes of these compounds. In 1, bim ligands bridge each pair of Zn atoms into a single-stranded helical chain through metal–ligand interactions to generate a 2-D grid-like structure. Complex 2features a mononuclear structure due to the large steric hinderance of H2bbim ligand. Through N–HCl hydrogen bonds, the dinuclear units of 3are alternately arranged to afford a unique 1-D helical chain. Complex 4exhibits a 1-D zig-zag chain which consists of [Co(Hbim)(Him)]2+units bridged by oxalate ligands, and 5displays a 1-D chain structure consisting of Zn(H2bbim)2+units linked by 1,4-BDC ligands. [ABSTRACT FROM AUTHOR]

Five new eremophilane-type sesquiterpenes, 3β-(acetyloxy)-7-hydroxynoreremophila-6,9-dien-8-one (1), 8β-hydroxy-2-dehydroxyliguhodgsonal (2), 3β-(acetyloxy)-11-methoxy-8-oxoeremophila-6,9-dien-12-oic acid (3), 3β-(acetyloxy)-11-(2′-methylbutanoyloxy)-8-oxoeremophila-6,9-dien-12-oic acid (4), and 3β-(acetyloxy)-6α-hydroxyligularenolide (5), along with the three known compounds 6–8, were isolated from the roots of Ligularia przewalskii.The structures of the new compounds were elucidated through spectral studies including HR-EI-MS, IR, and NMR data. [ABSTRACT FROM AUTHOR]

Abstract Two new arsenic–vanadium clusters, [Co(2,2'- bpy)3]2[As8V14O42(H2O)] · 3H2O (1), [2,2'-bpy][Ni(2,2'-bpy)3]2[As8V14O42(H2O)] · 3H2O (2) (2,2'-bpy=2,2'-bipyridine), have been hydrothermally synthesized and characterized by IR, elemental analysis, UV–VIS, EPR, TGA, XPS, and single crystal X-ray diffraction analysis. Crystal data: 1, triclinic, P1, a=14.368(3) Å, b=16.753(3) Å, c=24.632(5) Å, a=94.15(3)°, ß=93.16(3)°, ?=113.05(3)°, Z=2; 2, monoclinic, P21/c, a= 30.2150(4) Å, b=14.0690(3) Å, c=26.0536(3) Å, ß=106.8960(10)°, Z=4. X-ray crystallographic studies showed that crystals 1 and 2 are both composed of discrete cluster anion [As8V14O42(H2O)]4- and transition metal coordination complexes [M(2,2'-bpy)3]2+ (M=Co or Ni). Interestingly, compound 2 contains another neutral organic space filler of 2,2'-bpy. To the best of our knowledge, compounds 1 and 2 are the first examples of structurally characterized vanadium/2,2'-bpy/arsenate polyoxometallates. [ABSTRACT FROM AUTHOR]

The novel polyoxometalate {[As8V13NiClO41][Ni(en)2(H2O)][Ni(en)2]}{[Ni(en)2(H2O)2]0.5}·4H2O (1), which is the first example of a chainlike inorganic-organic hybrid polymer based on dimeric polyoxoanions linked by nickel complex fragments, has been synthesized in the system of As2O3-V2O5-H2C2O4-en-NiCl2·6H2O-H2Ounder hydrothermal conditions and characterized by IR, TGA, elemental analysis, single crystal X-ray diffraction, XPS, and magnetic susceptibility studies, respectively. This compound crystallized in the triclinic space group P&macr1; with a = 13.358(3) Å b: 14.198(3) Å c = 19.723(4) Å, &alphal;= 83.88(3)°, β = 86.04(3)°, γ = 64.66(3)°, V= 3360.2(2) &Arig;³, and Z = 2. Interestingly, the dimeric polyoxoanion contains two {[Ni(en)2(H2O)][As8V13NiClO41]} cluster units linked by Ni-O-As bonds and is a Ni-substituted [As8V13NiCI041] cluster supported by [Ni(en)2H2O)] coordination fragment. The chainlike structure consists of {[Ni(en)2(H2O)][As8V13NiClO41]}2 dimeric polyoxoanions and [Ni(en)2] groups which are linked together through vertexes forming a unique one-dimensional polymer. The study of the magnetic susceptibility of 1 demonstrates the presence of antiferromagnetic interaction in 1. [ABSTRACT FROM AUTHOR]

The coordination chemistry of inorganic cobalt salt and the organic ligands H4bbh (=benzene-1,2,4,5-bihydrazide) and H3bcbh (=benzene-4-carboxylate-1,2-bihydrazide) generated through the in situ hydrothermal acylate reaction of H4bta (=benzene-1,2,4,5-tetracarboxylic acid) and H3btc (=benzene-1,2,4-tricarboxylic acid) with hydrazine hydrate, respectively, has been investigated. Three new coordination polymers were prepared and fully characterized by infrared spectroscopy, elemental analysis, and single-crystal X-ray diffraction. The compound [Co(µ3-H2bbh)(phen)]n (1) (triclinic space group P&1macr; with a = 9.762(4) Å, b = 10.169(4) Å, c = 11.143(4) Å, α = 80.96(3)°, β = 64.49(3)°, γ = 71.88(3)°, Z = 2) was synthesized from the reaction of CoCl2·6H2O, H4bta (=benzene-1,2,4,5tetracarboxylic acid), N2H4·H2O, phen (=1,10-phenanthroline) and H2O, and consists of one-dimensional doublechains. [Co(µ4-H2bbh)(H2O)2]n (2) (monoclinic space group P2(1)/c with a = 6.8687(5) Å, b = 7.5943(6) Å, c = 10.0401(6) Å, β = 95.250(4)°, Z = 2) was generated by the combination of COCI2·6H2O, H4bta,N2H4·H2O, and H2O. It adopts a three-dimensional structural motif in the solid state with channels consisting of 20-numbered rings. [Co(µ3-Hbcbh)(bpy)]n (3) (monoclinic space group Cc with a = 9.9464(13) Å, b = 23.685(5) Å, c = 7.9491 (16) Å, β = 117.677(13)°, Z = 4) was obtained from the mixture of CoCl2·6H2O, N2H4·H2O, H3btc (=benzene-l,2,4tricarboxylic acid), bpy (=2,2'-dipyridyl), and H2O, and features a two-dimensional plane. The results of magnetic research indicate that there exist antiferromagnetic interactions between Co centers in both compounds 1 and 2. [ABSTRACT FROM AUTHOR]

The hydrothermal reactions of CuBr[sub 2], CuX (X=Br, I), and phen (phen= 1,10phenanthroline, C[sub 12]H[sub 8]N[sub 2]) have lead to the syntheses of two novel complexes of one-dimensional [Cu[sub 4]Br[sub 2]I[sub 3](phen)[sub 2]][sub n] 1 and trinuclear discrete cluster Cu[sub 3]Br[sub 3](phen)[sub 2] 2. Both compounds were characterized by singe-crystal X-ray diffraction. Crystal data for 1. Monoclinic, space group P2[sub 1]/c with a= 14.054(3) Å, b= 13.700(3) Å, c= 15.920(3) Å, β = 114.16(3)°, Z= 2; 2. Monoclinic, space group C2/c with a=10.040(2) Å, b=14.516(3) Å, c=16.319(3) Å, β=94.29(3)°, Z=6. [ABSTRACT FROM AUTHOR]

A new compound, [Cu(en) 2 (H 2 O)]{[Cu 0.5 (en)] 3 [V V W 6.5 VI W 3 V V 4.5 IV O 42 Cu(en) 2 ]}·3.5H 2 O ( 1 ) (en = ethylenediamine), has been hydrothermally synthesized and characterized by elemental analysis, IR, ESR, XPS, TG analysis and single-crystal X-ray diffraction analysis. Compound 1 exhibits a novel 2-D structure linked by 1-D infinite left- and right-handed helical chains and transition metal coordination fragments. Adjacent layers are further interconnected into a 3-D supramolecular structure via hydrogen bonds. The magnetic susceptibility of compound 1 demonstrated the presence of antiferromagnetic interactions. [ABSTRACT FROM AUTHOR]

The hydro(solvo)thermal self-assembles of CuI, KI and 2,5-dicarboxylpyridine [2,5-(COOH)2py] in different molar ratios in H2O/alcohol solutions produced three Cu coordination polymers as 2-D [N-C2H5py][Cu3I4] 1, 1-D [N-CH3py][Cu2I3] 2 as well as 1-D [Cu(2-COOpy)2]H2O 3 (N-C2H5py=N-ethylpyridine, N-CH3py=N-methylpyridine, 2-COOpy=2-carboxylpyridine). N-C2H5py in 1 and N-CH3py in 2 derived from the solvothermal in situ simultaneous decarboxylation and N-alkylation reactions of 2,5-(COOH)2py. The semi-decarboxylation reaction of 2,5-(COOH)2py into 2-COOpy occurred in the preparation of 3. X-ray single-crystal analysis revealed that CuI is transformed into a 2-D [Cu3I4]− layer in compound 1 and a 1-D chain in compound 2, templated by [N-C2H5py]+ and [N-CH3py]+, respectively. Compound 3 is a divalent Cu compound. The Cu(II) centers with a 4+2 geometry are coordinated by μ3-mode 2-COOpy ligands. All of the title compounds were characterized by CHN analysis, IR spectrum analysis and TG analysis. Compounds 1 and 2 exhibit fluorescence properties with the maximum emissions at 581 nm for 1 and 537 nm for 2. [Copyright &y& Elsevier]