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Three novel heteropolyanions [PMo12Sb2O40][Cu(enMe)2]·4H2O (1), [PMo12Sb2O40][Ni(enMe)2]·4H2O (2) and [PMo12Sb2O40][Cu(en)2]·H3O·H2O (3) (enMe = 1,2-diaminopropane, en = ethylene diamine) have been synthesized and characterized by IR spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetric analyses and elemental analyses. Single-crystal X-ray diffraction analyses reveal that these three compounds represent the first examples of compounds based on the novel polyoxoanion {PMo12Sb2O40} and different transition metal coordination complexes. 1and 2are isostructural and both exhibit novel 1-D structures. In contrast to 1and 2, 3exhibits a substantially distinct novel 1-D structure. In addition, 3is the first example of an extended structure constructed from polyoxoanions and Cu+transition metal coordination complexes. [ABSTRACT FROM AUTHOR]

Abstract: A novel modified POM (im)2·2H2O (im=imidazole) (1) has been hydrothermally synthesized from the system Sb2O3–H3PMo12O40–H2C2O4–im and characterized by elemental analysis, IR, UV–Vis, XPS, TGA and single crystal X-ray diffraction. The highly reduced polyoxoanion represents the first example of bi-antimony capped α-Keggin phosphomolybdate, in which the Sb atoms exhibit novel Ψ-rhombic pyramidal {SbO4E} hemidirected coordination geometry with coordination number 4. [Copyright &y& Elsevier]

Abstract: Two new nickel(II) phosphonates (H4PMIDA= N-(phosphonomethyl)iminodiacetic acid, H4L), one-dimensional zigzag chain (NH4)2[Ni(PMIDA)(H2O)] (1) and tetramer (H3O)8[Ni4O2(HPMIDA)4(H2O)2] (2), have been solvothermally synthesized and characterized by elemental analyses, IR, TGA and X-ray single-crystal diffraction, and their magnetic and fluorescent properties are also reported. Compound 1 is the first chain phosphonate linked by carboxyl group in anti–anti mode based on Ni(II) and H4PMIDA ligand, and compound 2 with tetranuclear units is the first example of showing the spin-canting antiferromagnetic coupling between Ni(II) centers. [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: Four new organic–inorganic hybrid compounds based on bicapped Keggin polyoxometalate {PMo12Sb2O40}: [H24,4′-bpy][PMo12Sb2O40]·6H2O (1), [Him]2[PMo12Sb2O40]·H2O (2), [H3(DABCO)2][PMo12Sb2O40]·2H2O (3) and [Mn(phen)3][PMo12Sb2O40] (4) (bpy=bipyridine, im=imidazole, DABCO=1,4-diazabicyclo[2,2,2]octane, phen=phenanthroline) 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. The four compounds are new examples of hybrid compounds based on bicapped Keggin polyoxometalate {PMo12Sb2O40}. Compound 1, 2 and 3 are constructed from {PMo12Sb2O40} anions and different organic moieties, respectively. Compound 4 is formed by combining {PMo12Sb2O40} anions and manganese coordination complexes. [Copyright &y& Elsevier]

Abstract: The first example of cadmium complex containing methyl orange [MO, (CH3)2NC6H4N=NC6H4SO3Na], formulated as [Cd(en)2(H2O)2](MO)2 1 (en=ethylenediamine) was synthesized hydrothermally and characterized by single-crystal X-ray diffraction, IR, XRD, elemental analysis and Raman spectroscopic analysis. Compound 1 display a two-dimensional supramolecular layer structure with ladder-like supramolecular chain by X-ray crystallographic analysis. MO anion immobilized by H-bonds, as acid–base indicator, shows a similar behavior in comparison with its solution counterpart in terms of response to pH. [Copyright &y& Elsevier]

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: 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]