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A novel organic–inorganic hybrid vanadium arsenate [H3V3O26(AsO4)4(phen)8(H2O)2] · 2H2O 1 (phen=phenanthroline) was synthesized by the hydrothermal reaction of V2O5, VOSO4, Na2HAsO4 · 7H2O, phen and water. Its structure was determined by elemental analyses, XPS spectra, EPR spectrum, TG analysis, IR spectrum and single-crystal X-ray diffraction. [Copyright &y& Elsevier]

A novel organic–inorganic hybrid vanadium arsenate [(VO)2(HAsO4)2(phen)2] 1 (phen=phenanthroline) has been hydrothermally synthesized and structurally characterized. The title compound contains an unusual 1D ladder-like {V/As/O} chain with the phen ligand directly coordinated to the vanadium arsenate skeleton. To the best of our knowledge, 1 represents the first example of 1D vanadium arsenate decorated with the directly coordinated organic ligands. [Copyright &y& Elsevier]

Abstract: The tetra-capped Keggin anion-supported Cobalt–Phenanthroline complex [Co2(phen)2(OH)2(H2O)4]0.5[{Co(phen)2(H2O)}2AsMo6 VIMo2 VV8 IVO44]·2H2O (1) and the bicapped Keggin anion-based Nickel–phenanthroline compound [Ni(phen)2H2O]2[AsMo11 VIMoVO40(VIVO2)0.5].2H2O(2), have been hydrothermally synthesized and structurally characterized by elemental analyses, single crystal X-ray diffraction, IR and X-ray photoelectron spectrum. The interesting structural feature of 1 is that there are two types of free complex cation [Co2(phen)2(OH)2(H2O)4]2+ in different orientations in the crystal structure of 1, and these free complex cations coexist in the space between polyoxometalate clusters. The structure of compound 2 is very like compound 1 except that the Keggin unit is bi-capped instead of tetra-capped. Compounds 1 and 2 are examples that Arsenicum-centered vanadomolybdate anion acts as an active building block in the fabrication of polyoxometalates-supported hybrid solids. Then, the magnetic characteristic of 1 is typical of a dominant ferromagnetic interactions in the 6–300K temperature range and a succedent antiferromagnetic interactions in the very low temperature range (2–6K), while the magnetic behavior for 2 is characteristic of a dominant ferromagnetic interactions in the 6–300K temperature range and succedent antiferromagnetic interactions in the very low temperature range (2–6K). [Copyright &y& Elsevier]