5 years ago

Tuning dimensionality of octamolybdate structures through selecting different ligands

Tuning dimensionality of octamolybdate structures through selecting different ligands
By using different organic ligands, six octamolybdate hybrid compounds with different dimensionalities, namely, [Ag4 (dpz)8 (β-Mo8O26)] (1), [Cu4(dpz)8 (β-Mo8O26)] (2), [Co2(tbz)4(H2O)2 (β-Mo8O26)] (3), [Ni2(tbz)4(H2O)2 (β-Mo8O26)]·2H2O (4), [Cu(tbz) (H2O) (β-Mo8O26)1/2] (5), [Cu(btp)2(H2O) (β-Mo8O26)1/2]·2H2O (6) (dpz = 3,5-dimethyl-pyrazolidine, tbz = 2-(4-thiazolyl)benzimidazole, btp = 1,3-bis(1,2,4-triazol-1-yl)propane), have been synthesized under hydrothermal conditions and characterized by single crystal X-ray diffraction analyses, elemental analyses and IR spectra. By using a dpz ligand, two isostructural 0D compounds 1 and 2 were obtained, with four {M(dpz)2} fragments (M = Ag for 1, Cu for 2) supporting one anion. When rigid tbz was used, 0D compounds 3 and 4, and 1D structure of compound 5 was constructed. The tbz play a terminate chelate role in these compounds. By selecting a flexible bis(triazole) btp ligand with more N donors, a 2D hamburger-like layer is formed. Adjacent layers further interpenetrate with each other to construct a 3D interpenetrating framework of compound 6, realizing dimensionality from 2D to 3D. Using different ligands to tune the dimensionality of POM-based structures is rational. The electrochemical and photocatalytic properties of compounds 16 were researched, in which the POM subunit is regarded as active component but not organic moiety.

Publisher URL: www.sciencedirect.com/science

DOI: S0022286017314941

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