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Two new dodeca-niobate materials, K3[Nb2O2][H7SiNb12O40]·16H2O (1) and [Cu(en)2]9[(VNb12V1.69Nb0.31O42en0.31)2]·20.69H2O (2) (en = ethylenediamine), have been obtained under hydrothermal conditions and characterized by IR, UV-Vis, XRD, and single crystal X-ray diffraction analysis. Single crystal X-ray analysis reveals that compound 1 presents a reasonable bridging layer structure model and that K plays a great role in the three-dimensional structure. Compound 2 is the first capped Keggin POM with organic ligand chelating the capping atom. The photocatalytic hydrogen evolution and styrene epoxidation catalytic properties of the two compounds were also assessed. Additionally, compound 1 is also a good photocatalyst to degrade RhB. [ABSTRACT FROM AUTHOR]

[Display omitted] Four polyoxoniobate-based compounds, namely [Cu(en) 2 ] 4 [Cu(en) 2 (H 2 O)][VNb 12 V 4 O 44 ]·2.25H 2 O·3OH– (1), [Cu(en) 2 ] 4 [ Cu (en) 2 (H 2 O)] 3 [Cu(en) 2 (H 2 O) 2 ] 3 {[SiNb 12 Sb 2 O 40 ] 2 }·25H 2 O (2), [Cu(en) 2 ] 2 [ Cu (en) 2 (H 2 O) 2 ] 4 [SiNb 12 V 2 O 42 ]·7H 2 O (3), and [Cu(en) 2 ] 3 {[Cu(en) 2 ][H 2 V 4 Nb 6 O 30 ]}·12H 2 O (4) have been successfully synthesized and characterized by using FT-IR, XRD, and single crystal X-ray diffraction analyses, etc. Out of the four compounds, compound 1 is based on a rare four V capped polyoxoniobate cluster [VNb 12 V 4 O 44 ]7−, [Cu(en) 2 ]2+, and [Cu(en) 2 (H 2 O)]2+ complexes, forming a 1-D chain structure with Cu complexes as bridges. Compound 2 contains a Keggin polyoxoniobate with double Sb caps, and forming a network structure based on Sb capped polyoxoniobates and copper complexes with two different large parallelogram channels. Compounds 3 and 4 have been reported previously by Wang et al[1] and Hu et al[2], respectively. In this work, we not only reported the syntheses, structures and characterizations of these compounds, but also we further investigated the catalytic properties of these four compounds for styrene epoxidation. [ABSTRACT FROM AUTHOR]

Two new hybrid compounds, [Cu(1)(phen)(H2O)][Cu(2)(phen)(H2O)]([Cu(3)]0.25(H2O)][P2Mo5O23]·3.75H2O (1) and [Cu(en)2]1.5[P2Mo5O23]2·(enH2)3·2H2O (2) (phen = 1,10-phenanthroline, en = ethylenediamine), have been hydrothermally synthesized and characterized by IR, UV–Vis spectroscopy, X-ray photoelectron spectroscopy (XPS), powder XRD analyses, TG analyses, cyclic voltammogram analyses, elemental analyses, and single crystal X-ray diffraction analyses. Single crystal X-ray diffraction analyses reveal that the two compounds have a 1-D chain structure formed by Strandberg-type POMs and TMCs with –A–B–C–B–A–B–C–B– linking mode, then further extend into a 2-D layer structure through π⋯π or hydrogen bond interactions. [ABSTRACT FROM AUTHOR]

Two new organic–inorganic hybrid compounds, [Cu(phen)(prz)]2[PMoV1MoVI7VIV2VV4O42]·4H2O (1) and [Ag2(phen)4]2[PMoV1MoVI7VIV2VV4O42] (2) (phen = 1,10-phenanthroline, prz = pyrazine), have been synthesized and characterized by IR, XPS, XRD, UV–vis, fluorescent spectra analyses, elemental analyses, X-ray diffraction analyses, TG analyses, and cyclic voltammetric measurements. Both compounds are formed by Keggin POM cores and transition metal fragments. Compound1exhibits an unprecedented 1-D chain structure constructed from [PMoV1MoVI7VIV2VV4O42]4−and [Cu(phen)(prz)]2+in the –A–B↑–C–B↓– linking mode. Compound2shows a supramolecular structure formed by [PMoV1MoVI7VIV2VV4O42]4−and [Ag2(phen)4]2+. [ABSTRACT FROM PUBLISHER]

Five new vanadoantimonates [Cd(en)3]3[Sb6V15O42(H2O)]·8H2O (1), [Ni(en)3]2[H2Sb6V15O42(H2O)]·5H2O (2), [Co(en)3]2[H2Sb6V15O42(H2O)]·5H2O (3), [H4Sb8V14O42(H2O)]·5H2O (4) and [Co(enMe)3]2[Sb8V14O42(H2O)]·4H2O (5) (en = ethylenediamine, enMe = 1,2-propanediamine) have been obtained under hydrothermal conditions and characterized by IR, UV-Vis, XRD, ESR and CD spectroscopy. Compound 1 is a chiral compound constructed from [Sb6V15O42(H2O)]6− (Sb6V15) and [Cd(en)3]2+. Compounds 2 and 3 are isostructural and isomorphous. Both compounds are chiral, each of which contains a 2-D inorganic layer formed by [H2Sb6V15O42(H2O)]4−via V–O…Sb contacts. Compound 4 contains a 2-D inorganic layer formed by [H4Sb8V14O42(H2O)], of which [H4Sb8V14O42(H2O)] is directed by both V–O…Sb and Sb–O…Sb interactions. Compound 5 contains a 1-D zigzag chain structure formed by [Sb8V14O42(H2O)]4− (Sb8V14) via Sb–O…Sb contacts. [ABSTRACT FROM AUTHOR]

Five new organic–inorganic hybrid compounds based on different polyoxoanions [HxGeW12O40]n− or [H3As2W18O62]3− (x = 0, 2; n = 4, 2), namely [Cu3(2,2′-bpy)3(inic)(OH)(H2O)][GeW12O40]·1.5H2O (1), [Cu2(phen)2(μ2-Cl)2(inic)]2[H2GeW12O40]·2H2O (2), [Cu2(phen)2(μ2-Cl)Cl(nic)]2[H2GeW12O40] (3), [Cu2(2,2′-bpy)2(hnic)Cl]2[H2GeW12O40] (4), [Cu(phen)(inic)H2O][Cu2(phen)2(inic)2(H2O)][H3As2W18O62]·3H2O (5) (inic = isonicotinic acid, nic = nicotinic acid, hnic = 2-hydroxy-nicotinic acid, 2,2′-bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline), have been synthesized and characterized by IR, UV-Vis, XRD, cyclic voltammetric measurements and single crystal X-ray diffraction analysis. Single crystal X-ray analysis reveals that compound 1 is isomorphous and isostructural with a compound reported by us recently, the main difference between the two is the heteroatom of the polyoxoanions in the two compounds. Compound 2 is a supramolecular structure constructed from polyoxoanions and transition metal mixed-organic-ligand complexes. Compound 3 is a novel polyoxoanion bi-supported transition metal mixed-organic-ligand complex. Compound 4 is a 1-D chain structure constructed from polyoxoanions and transition metal mixed-organic-ligand complexes. The photodegradation properties of compounds 1–5 have been analyzed. [ABSTRACT FROM AUTHOR]

Three compounds, [AsMo8V6O42][Cu(2,2ʹ-bpy)2]2[Cu(2,2ʹ-bpy)]·4H2O (1), [PMo8V6O42][Cu(2,2ʹ-bpy)2]2[Cu(2,2ʹ-bpy)]·3H2O (2) and [PMo8V6O42][Cu(2,2ʹ-bpy)2]2[Cu(2,2ʹ-bpy)]·3.5H2O (3), have been synthesized under hydrothermal conditions and characterized by IR, UV–vis, XRD, TG, elemental analysis, and X-ray diffraction analysis. Single-crystal X-ray structure analysis reveals that1and2are isostructural and isomorphous, whereas2and3are polymorphs. Polymorphs of1have not been synthesized yet. The mixed-valent transition metal ion in1–3has been further confirmed by TG analyses. Catalytic properties of1and2have also been studied. [ABSTRACT FROM PUBLISHER]

Six new organic–inorganic hybrid compounds based on [XM12O40]4− (X = heteroatom, M = metal atom), namely [Cu(pic)2][H2XM12O40]·2Hapy·2apy (X = Si, M = W for 1, X = Ge, M = W for 2 and X = Si, M = Mo for 3), [Cu(2,2′-bpy)2][Cu(2,2′-bpy)(H2O)][Cu(pic)2]0.5[XM12O40]·nH2O (X = Si, M = Mo, n = 0.5 for 4, X = Ge, M = W, n = 1 for 5) and [Cu(phen)(H2O)]2[Cu(pic)2][GeW12O40]·2.5H2O (6) (pic = deprotonated picolinic acid, apy = 2-aminopyridine, 2,2′-bpy = 2,2′-bipyridine, phen = phenanthroline), have been synthesized and characterized by IR, UV-Vis, XRD, cyclic voltammetric measurements and single crystal X-ray diffraction analysis. Single crystal X-ray analysis reveals that compounds 1–3 are isomorphous and isostructural, in which each is based on [H2XM12O40]2− and [Cu(pic)2]. Compounds 4 and 5 are also isomorphous and isostructural, of which the structures are more interesting than those of compounds 1–3. Both structures are constructed from [XM12O40]4− and metal mixed–organic–ligand complexes. Compound 6 is also constructed from Keggin ions and metal mixed–organic–ligand complexes, which are, however, thoroughly different from those of compounds 4 and 5. The photodegradation properties of compounds 1–6 have been analyzed. Compounds 1–3 also exhibit rapid absorption properties for RhB (Rhodamine B). Detailed analysis of the photodegradation properties of compounds 1–5 reveals that the molybdate POM has stronger degradation ability for RhB than the tungstate one. [ABSTRACT FROM AUTHOR]

Four new organic–inorganic hybrid compounds, namely, [Cu3(4,4′-bpy)3][HSiW12O40]·(C3H4N2) (1), [Cu3(4,4′-bpy)3][PMo12O40]·(C5H6N2)·0.5H2O (2), [Cu2(4,4′-bpy)2][HPMo12O40]·(C5H6N2) (3) and [Cu(Phen)(4,4′-bpy)(H2O)]2[PW12O40]·(4,4′-bpy) (4) (C3H4N2 = imidazole, C5H6N2 = 2-aminopyridine, bpy = bipyridine, Phen = 1,10-phenanthroline), have been synthesized and characterized by IR, UV-vis, powder XRD, cyclic voltammetry analysis, photoluminescence analysis, elemental analyses and single crystal X-ray diffraction. The four compounds represent new examples of secondary organic moiety templated frameworks constructed from Keggin polyanions, metal ions and organic ligands. Compounds 1 and 2 present 3-D framework structures; compound 3 exhibits a 1-D ladder-like structure and compound 4 shows a 2-D layered framework structure. It is noted that the packing structures of compounds 1 and 2 are almost identical; however, the crystal space groups and cell parameters of the two are thoroughly different. Such a phenomenon has also been observed between compound 3 and a compound recently reported by us. Compound 4 is the first framework structure constructed from polyoxometalates, metal ions and mixed organic ligands. In addition, all the four frameworks are combined with dissociated organic moieties as templates. [ABSTRACT FROM AUTHOR]

Abstract: A novel three-dimensional (3D) coordination polymer [Cd(bta)0.5(N2H4)(H2O)]·H2O (1) (H4bta=benzene-1,2,4,5-tetracarboxylic acid; N2H4 =hydrazine) was synthesized hydrothermally and characterized by IR, elemental analysis, TGA and X-ray diffraction analysis. Compound 1 is the first example of 3D coordination compound containing trans-μ 2-bridging ligand N2H4. In 1, Cadmium atoms are coordinated by bta4− ligands to form sinusoidal ruffling layers and the layer are further linked by hydrazine ligands into 3D network with a (83)(85·10) topology structure. In addition, the thermogravimetric analysis and fluorescent property of compound 1 have been investigated. [Copyright &y& Elsevier]

Abstract: Two isomorphous three-dimensional lanthanide metal-organic frameworks, K[Ln2(NTA)(ox)2(H2O)2]·3H2O (Ln = Pr (1) and Gd (2), NTA = nitrilotriacetate, ox = oxalate) have been synthesized under hydrothermal conditions and characterized by elemental analyses, IR spectroscopy, single-crystal X-ray diffraction, thermogravimetric analysis (TGA) and magnetic analyses. The 3D frameworks of compounds 1 and 2 possess three topologically nonequivalent 4-connected nodes synchronously and exhibit unprecedented (65∙8)(43∙63)(4∙65) topologies. Variable-temperature magnetic susceptibility measurements for complexes 1 and 2 indicate there exist antiferromagnetic interactions between magnetic centers. [ABSTRACT FROM AUTHOR]

Two compounds based on polyoxometalates, (4,4'-H2bpy)7(4,4'-Hbpy)[ [image omitted]]2[ [image omitted]] ·10H2O (1) and (4,4'-H2bpy)6(4,4'-bpy)[ [image omitted]]2 · 18H2O (2), have been prepared under hydrothermal conditions and characterized by IR, XPS spectra, TG analyses, and single crystal X-ray diffraction. Both compounds consist of 4,4'-bipyridine units and polyoxometalates: [ [image omitted]]5- for 1 and [ [image omitted]]6- for 2. In addition, 1 contains both Keggin-type and disordered Keggin-type anions, while 2 contains a (H2O)10 water cluster. [ABSTRACT FROM AUTHOR]

Two supramolecular compounds [Fe(2,2'-bipy)3]2[ [image omitted](Cl)] · 4.67H2O (1) and [Ni(enMe)3]2[ [image omitted](Cl)] · 2H2O (2) have been prepared under hydrothermal conditions and characterized by elemental analyses, IR, TGA, ESR, magnetic properties, and single crystal X-ray diffraction analyses. Crystal data for 1: tetragonal, I-42d, a = 13.6043(19), b = 13.6043(19), c = 50.544(10) Å, V = 9354(3) Å3; for 2: hexagonal, P6(3)/m, a = 12.6046(12), b = 12.6046(12), c = 22.563(5) Å, V = 3104.4(7) Å3. Compound 1 is constructed from cations [Fe(2,2'-bipy)3]3+, polyoxovanadates [ [image omitted](Cl)]6-, and water molecules. Compound 2 is composed of cations [Ni(enMe)3]2+, clusters [ [image omitted](Cl)]8-, and water molecules. There are hydrogen-bonding interactions between polyoxovanadates, organic moieties, and/or water molecules in 1 and 2, forming different 2-D layered networks. [ABSTRACT FROM AUTHOR]

Abstract: Two novel polyoxometalate derivatives, {X IVWVI 10WV 2O40[Cu(en)2(H2O)]3} [X=V (1), Si (2); en=ethylenediamine], have been hydrothermally synthesized and characterized by elemental analyses, IR, UV–Vis, XPS, EPR, TG and single crystal X-ray diffraction analyses. They represent the first classical Keggin polyoxoanion supported by three transition metal complex moieties, which further act as the neutral molecular unit for the construction of the interesting three-dimensional supramolecular frameworks. The magnetic properties of 1 have also been studied in the temperature range of 4–300K, and its magnetic susceptibility obeys the Curie–Weiss law, showing antiferromagnetic coupling. [Copyright &y& Elsevier]

Abstract: Two new polyoxometalates (1) and (2) (en=ethylenediamine, phen=1,10-phenanthroline) have been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction, IR, EPR, XPS, elemental analysis and thermogravimetry. Their structures exhibit interesting 3D supramolecular networks, and contain new bicapped (pseudo-) Keggin-type tungsten–vanadium cluster and the template transition-metal complexes (TMCs) being generated in situ under mild hydrothermal conditions. Interestingly, compound 1 contains four different kinds of nickel complex countercations. [Copyright &y& Elsevier]

Abstract: Two new molybdenum–vanadium polyoxometalate tri-supported transition metal complexes [Cu(2,2′-bipy)] [Cu(2,2′-bipy)2]2[PMo8V6O42]·nH2O (n =1.5 (1) and n =2 (2); 2,2′-bipy=2,2′-bipyridine) have been hydrothermally synthesized and characterized by elemental analyses, IR, XPS and single-crystal X-ray diffraction analyses. Both compound 1 and compound 2 contain molybdenum–vanadium polyoxometalates, each of which support one [Cu(2,2′-bipy)]2+ cation and two [Cu(2,2′-bipy)2]2+ cations, respectively. The difference between compound 1 and compound 2 is that the polyoxoanion of 1 is a bi-capped α-Keggin cluster and that of 2 is a bi-capped pseudo-Keggin one. Studies of magnetic properties indicated the presence of ferromagnetic behaviors for compounds 1 and 2. [Copyright &y& Elsevier]

Abstract: A series of lanthanide coordination polymers, (Him) n [Ln(ip)2(H2O)] n [Ln=La(1), Pr(2), Nd(3) and Dy(4), H2ip=isophthalic acid, im=imidazole] and [Y2(ip)3(H2O)2] n ·nH2O (5), have been synthesized and characterized by elemental analyses, infrared (IR), ultraviolet-visible-near infrared (UV-Vis-NIR) and single-crystal X-ray diffraction analyses. The isostructural compounds 1–4 possess 3-D structures with three different kinds of channels. Compound 5 features a 2-D network making of two different kinds of quadruple-helical chains. Compounds 2 and 3 present the characteristic emissions of Pr(III) and Nd(III) ions in NIR region, respectively. Compound 4 shows sensitized luminescence of Dy(III) ions in visible region. [Copyright &y& Elsevier]

Abstract: Two new compounds, (Hbpy)3(bpy)2[K(Mo8O26)]·2H2O (1) and H3(bpy)5[K(Mo8O26)]·H2O(2) (bpy=4,4′-bipyridine) have been synthesized under hydrothermal condition by using nearly the same starting materials, and characterized by elemental analyses, IR, TGA, XPS and single crystal X-ray diffractions. The crystal structure analyses reveal that the two compounds possess unusual networks constructed from octamolybdates, potassium ions and organic groups. Both 1 and 2 consist of an identical inorganic chain , and they have analogous structures to each other with slightly different packing modes of the organic groups and water molecules and exhibit unusual three-dimensional (3D) supramolecular networks through extensive multi-point C–H⋯O and N–H⋯O hydrogen-bonding interactions. [Copyright &y& Elsevier]

Abstract: Two novel organic–inorganic hybrid compounds based on organoamines and polyoxovanadates formulated as (H2dien)4[H10V18O42(PO4)](PO4)·2H2O (1) (dien=diethylenetriamine) and (Him)8[HV18O42(PO4)] (2) (im=imidazole) have been prepared under hydrothermal conditions by using different starting materials, and characterized by elemental analyses, IR, ESR, XPS, TGA and single-crystal X-ray diffraction analyses. Crystal data for compound 1: C16H74N12O52V18P2, Monoclinic, space group C2/c, a=23.9593(4)Å, b=13.0098(2)Å, c=20.1703(4)Å, β=105.566(3)°, V=6056.6(19)Å3, Z=4; for compound 2, C24H41N16O46V18P, Tetragonal, space group I4/mmm, a=13.5154(8)Å, b=13.5154(8)Å, c=19.1136Å, β=90°, V=3491.4(3)Å3, Z=2. Compound 1 consists of protonated diens together with polyoxovanadates [H10V18O42(PO4)]5−. Compound 2 is composed of protonated ims and polyoxovanadates [HV18O42(PO4)]8−. There are hydrogen-bonding interactions between polyoxovanadates and different organoamines in 1 and 2. Polyoxovanadates are linked through H2dien into a three-dimensional network via hydrogen bonds in 1, while polyoxovanadates are linked by Him into a two-dimensional layer network via hydrogen bonds in 2. The crystal packing patterns of the two compounds reveal various supramolecular frameworks. [Copyright &y& Elsevier]

The compound [Zn(H2O)4]2[H2As6V15O42(H2O)]·2H2O (1) has been synthesized and characterized by elemental analysis, IR, ESR, magnetic measurement, third-order nonlinear property study and single crystal X-ray diffraction analysis. The compound 1 crystallizes in trigonal space group R3, a=b=12.0601(17) A˚, c=33.970(7) A˚, γ=120°, V=4278.8(12) A˚3, Z=3 and R1(wR2)=0.0512 (0.1171). The crystal structure is constructed from [H2As6V15O42(H2O)]4− anions and [Zn(H2O)4]2+ cations linked through hydrogen bonds into a network. The [H2As6V15O42(H2O)]6− cluster consists of 15 VO5 square pyramids linked by three As2O5 handle-like units. [Copyright &y& Elsevier]

A novel vanadium oxide, [Cu(phen)V4O10]∞ (1), has been hydrothermally synthesized and characterized by single-crystal X-ray diffraction, elemental analysis, IR, EPR spectroscopy and thermal analysis. The compound crystallizes in monoclinic structure of P21/m with a=7.4169(10) A˚, b=10.0460(13) A˚, c=11.0845(15) A˚, β=102.520(2)°, V=806.27(19) A˚3 and Z=2. [Copyright &y& Elsevier]

Four new compounds based on Keggin polyoxotungstates and transition metal complexes have been synthesized and characterized by IR, UV–Vis, XRD, XPS, elemental analysis and X-ray diffraction analysis. [Cd(2,2′-bpy) 3 ][HPW 12 O 40 ](2,2′-bpy) ( 1 ) and [TBA] 2 [Mn(phen) 3 ][HBW 12 O 40 ]·2H 2 O ( 2 ) (bpy = bipyridine, phen = 1,10-phenanthroline, TBA = tetrabutylammonium) are two multi-component compounds, of which compound 1 is formed by [HPW 12 O 40 ] 2− , [Cd(2,2′-bpy) 3 ] 2+ and 2,2′-bpy, and compound 2 is constructed from [BW 12 O 40 ] 5− , [Mn(phen) 3 ] 2+ and TBA + species. {[Co(phen) 2 (H 2 O)] 2 [HAlW 12 O 40 ]]}·3H 2 O ( 3 ) is a Keggin polyoxotungstate bi-supported transition metal complex. {[Cd(2,2′-bpy) 2 ] 2 [SiW 12 O 40 ]} ( 4 ) is a 2-D layered framework structure of [SiW 12 O 40 ] 4− bridge by [Cd(2,2′-bpy) 2 ] 2+ . The catalytic properties of compounds 1 – 4 have been investigated and we found that all the four catalysts are active for the epoxidation of styrene. [ABSTRACT FROM AUTHOR]

Two new POMOF compounds, namely [PMo 12 V 2 O 42 ][Cu 3 (4,4’-bpy) 3 ]·(DABCO) ( 1 ) and [PMo 10 V 4 O 42 ][Cu 2 (4,4’-bpy) 2 ][Cu(phen) 2 ] 2 ( 2 ) (DABCO = triethylenediamine, bpy = bipyridine, phen = 1,10-phenanthroline)), have been synthesized and characterized by IR, UV–Vis, XRD, elemental analysis and X-ray diffraction analysis. Crystal structure analyses reveal that compounds 1 and 2 exhibit novel 2-D layered framework structures constructed from bi-capped Keggin molybdenum-vanadium polyoxoanions, metals and organic ligands, respectively. The main difference of the two compounds is that compound 2 contains both Cu 2+ and Cu + complexes. In addition, we also investigate the catalytic properties of the two compounds, both compound 1 and 2 are excellent catalysts for the epoxidation of styrene. [ABSTRACT FROM AUTHOR]

The new compound (IV) crystallizes in the orthorhombic space group Fdd2 with Z = 8 (single crystal XRD). [ABSTRACT FROM AUTHOR]

Abstract: Four new hybrid compounds based on Keggin polyoxometallates and transition metal complexes, [Cu(phen)2]4[GeW12O40] (1), [Cu(bpy)(phen)]2[Cu(bpy)2]3[BW12O40] (2), [Cu(bpy)(phen)][Cu(bpy)2]3[SiW12O40] (3) and [Cu(bpy)2]4[GeW12O40] (4) (phen=1,10-phenanthroline, bpy=2,2′-bipyridine), have been hydrothermally synthesized and characterized by IR spectra, UV–Vis, XPS, XRD and single crystal X-ray diffraction analyses. Compounds 1, 2, 3 and 4 are new examples of hybrids based on polyoxometallates and transition metal complexes with a lower positive charge. [Copyright &y& Elsevier]

Abstract: Two new organic–inorganic compounds based on polyoxometalates, metal halide clusters and organic ligands: [BW12O40]2[Cu2(Phen)4Cl](H24, 4′-bpy)4·H3O·5H2O (1) and [HPW12O40][Cd2(Phen)4Cl2](4, 4′-bpy) (2) (Phen=1, 10-phenanthroline, bpy=bipyridine), have been prepared and characterized by IR, UV–vis, XPS, XRD and single crystal X-ray diffraction analyses. Crystal structure analyses reveal that compound 1 is constructed from [BW12O40]5−, metal halide clusters [Cu2(Phen)4Cl]+and 4, 4′-bpy ligands, while compound 2 is constructed from [PW12O40]3−, metal halide cluster [Cd2(Phen)4Cl2]2+ and 4, 4′-bpy ligands. Compound 1 and compound 2 are not common hybrids based on polyoxometalates and metal halide clusters, they also contain dissociated organic ligands, therefore, compound 1 and 2 are the first examples of hybrids based on polyoxometalates, metal halide clusters and organic ligands. [Copyright &y& Elsevier]

Abstract: Four new supramolecular architectures based on Keggin polyoxometalates (POMs): [(HSiMo12O40)(H4,4′-bpy)2][(H4,4′-bpy)(H2O)2]·2H2O (1), [(HSiW12O40)(H4,4′-bpy)2][(H4,4′-bpy)(H2O)2]·2H2O (2), [(SiW12O40)(H4,4′-bpy)4]·(4,4′-bpy)·2H2O (3) and [H4SiW12O40](2,2′-bpy)4 (4) (bpy=bipyridine) have been prepared hydrothermally and characterized by IR, UV–Vis spectroscopy, X-ray photoelectron spectroscopy (XPS), powder XRD analyses, elemental analyses, fluorescence analysis and single crystal X-ray diffraction analyses. Both compounds 1 and 2 exhibit supramolecular 2D layer structures. Compound 3 exhibits a novel supramolecular double chain structure. Compound 4 contains a 1D chain structure with two 2,2′-bpy ligands as double bridges. It should be noted that compound 4 is the first example of hybrid compound based on 2,2′-bpy ligands and POMs. [Copyright &y& Elsevier]

Abstract: Two new hybrid compounds based on Keggin-type polyoxometalates: {[PMo12O40][Ni(Phen)2(H2O)]2}·K·2OH− (1) and [Cd2(Phen)4Cl2][HPW12O40]·H2O (2) (Phen=1,10-phenanthroline), have been prepared and characterized by IR, UV–vis, XPS, XRD and single crystal X-ray diffraction analyses. Compound 1 exhibits a 1-D chain structure constructed from Pseudo-Keggin polyoxometalate bi-supported transition metal coordination complexes linked by K+ ions. Compound 2 contains Pseudo-Keggin polyoxoanions [HPW12O40]2− and novel metal–chloride–ligand coordination complexes [Cd2(Phen)4Cl2]2+. [Copyright &y& Elsevier]

Abstract: Three new supramolecular compounds based on triethylenediamine and different polyoxometalates [WVI 3VV 3O19H]{[Cu(HDABCO)]2(H2O)} (1), [P2MoVI 18O62][HDABCO]2[H2DABCO]2·12H2O (2) and [MoVI 7.5WVI 0.5O27][Cu(HDABCO)]2·2H3O·2H2O (3) (DABCO=triethylenediamine) have been synthesized hydrothermally and characterized by IR, TG, XPS and X-ray diffraction analyses. Crystal structure analyses reveal that compound 1 exhibits a face-centered cubic packing motif, compound 2 displays a supramolecular structure constructed form the “chains” arranged hexagonally, compound 3 contains [Mo7.5W0.5O27]∞ chain decorated by [Cu(HDABCO)]2+ cations, which was then packed into a layer structure. These results show that the same organonitrogen combining with the different POMs will yield different supramolecular networks. [ABSTRACT FROM AUTHOR]

Abstract: A new compound [Mo8V7O42][Cu(2,2′-bpy)2]2[Cu(2,2′-bpy)]·2H3O (1) has been synthesized under hydrothermal conditions and characterized by IR, UV–vis spectrum, elemental analysis, XRD, ESR, XPS, X-ray diffraction analysis and magnetic property study. Single-crystal X-ray structure analysis indicates that the compound 1 is a novel Keggin polyoxoanion tri-supported mixed-valent transition metal coordination complex. [ABSTRACT FROM AUTHOR]

A new compound based on bi-capped Keggin polyoxoniobates and copper coordination complexes, with formula [Cu(en) 2 ][Cu(en) 2 (H 2 O) 2 ][Cu(en) 2 (H 2 O)] 2 [H 4 SiNb 12 V 2 O 42 ]·7H 2 O ( 1 ) (en = ethylenediamine), was obtained under hydrothermal condition and characterized by single crystal X-ray diffraction, infrared spectrum (IR), powder X-ray diffraction (PXRD), Ultraviolet–visible spectroscopy (UV–vis) and electron spin resonance (ESR) analysis. Compound 1 has three different types of copper complexes in it. A [Cu(en) 2 ] 2 + and two [Cu(en) 2 (H 2 O)] 2 + fragments were supported by the polyoxoniobate to form a novel polyoxoniobate tri-supported coordination complex. [ABSTRACT FROM AUTHOR]

Abstract: A novel compound 1 which represents the missing link between the discrete POMs and the POMs as building blocks in extended structure has already been hydrothermally synthesized and characterized by elemental analysis, IR, UV–Vis, XPS spectrum, TG analysis and single-crystal X-ray diffraction analysis. The study of the magnetic susceptibility of the compound 1 demonstrates the presence of ferromagnetic interactions. [Copyright &y& Elsevier]

Abstract: A novel polyoxometalate (1) has been hydrothermally synthesized and characterized by elemental analysis, IR spectrum, ESR spectrum and single crystal X-ray diffraction analysis. It is a novel Weakley-type POM supported transition metal coordination complex, also it contains a novel (H2O)14 water cluster in the structure. The study of the magnetic susceptibility of 1 demonstrates the presence of ferromagnetic interactions. [Copyright &y& Elsevier]

Abstract: A new compound [(BW12O40)Cd(2,2′-bpy)2(H2O)][Cd(2,2′-bpy)3]1.5·0.5H2O ( 1 ) has been hydrothermally synthesized and characterized by IR, UV–Vis, XPS spectrum, TG, XRD, elemental analysis and single crystal X-ray diffraction analysis. Crystal structure analysis reveals that 1 is the first Keggin polyoxoanion supported cadmium coordination complex. [ABSTRACT FROM AUTHOR]

Abstract: A novel polyoxometalate [PW11O39Ni(4,4′-Hbpy)]·(4,4′-H2bpy)2·3H2O (1) has been hydrothermally synthesized and characterized by IR, XPS, TG, elemental analysis and single-crystal X-ray diffraction analysis. Crystal structure analysis reveals that 1 is a novel metal coordination fragment derivative of the classic Keggin polyanion. [Copyright &y& Elsevier]

Abstract: A novel compound [P2W18M3O68][Cu(en)2]4·7H2O·2OH− (M=0.5W+0.5Cu) 1 which contains the first example of extended structure constructed from Knoth-type sandwich polyoxoanions and transition metal coordination complexes has been hydrothermally synthesized and characterized by elemental analysis, IR spectrum, UV–Vis spectrum and single-crystal X-ray diffraction analysis. Crystal data for 1: triclinic, space group, P-1, a =13.2718(7)Å, b =13.6432(8)Å, c =25.7307(15)Å, α =104.7340(10)°, β =96.7630(10)°, γ =90.0330(10)°, V =4472.2(4)Å3, Z =2. Structure solution and refinement based on 1090 parameters gave R1 (wR2)=0.0409 (0.0993). [Copyright &y& Elsevier]

• A new compound formed by Keggin tungstosilicates and [Mn(phen) 3 2+. • 2-D framework structure constructed from Keggin tungstosilicates and metal-2,2′-bpy complexes. • A rare example of POM compounds based on manganese complexes. • Two rare examples of polyoxometalate-based extended structures of metal-2,2′-bpy complexes. Three new compounds based on polyoxometalates, [Mn(phen) 3 2 [SiW 12 O 40 (1), [Zn(2,2′-bpy) 2 2 [SiW 12 O 40 (2) and [Cd(2,2′-bpy) 2 2 [SiW 12 O 40 (3) (2,2′-bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline) have been prepared under hydrothermal conditions and characterized by IR, XPS spectra, XRD, UV–Vis, single crystal X-ray diffraction and cyclic voltammetric measurements. Crystal structure analyses reveal that the above-mentioned three compounds consist of tungstosilicates and transition metal complexes, of the three compound 1 shows a 0-D structure constructed from [Mn(phen) 3 2+ and Keggin [SiW 12 O 40 4−. Compounds 2 and 3 are isostructural and isomorphous to each other, both exhibit a 2-D framework structure formed by tungstosilicates and transition metal complexes, which are [Zn(2,2′-bpy) 2 2+ for compound 2 and [Cd(2,2′-bpy) 2 2+ for compound 3. [ABSTRACT FROM AUTHOR]