Hydrothermal syntheses and structural characterization of two organic-inorganic hybrid compounds based on Lindqvist polyanions

摘要

Two organic-inorganic hybrid polyoxometalates {[V₂W₄O₁₉{Cu(2,2′-bipy)₂}₂] · (4,4′-bipy)} _n (1) and [Co(2,2′-bipy)₃][W₆O₁₉] · H₂O (2) (2,2′-bipy = 2,2′-bipyridine, 4,4′-bipy = 4,4′-bipyridine), constructed by Lindqvist polyanions and transition metal coordination cations, have been synthesized under hydrothermal conditions and characterized by elemental analysis, IR, UV spectra, thermogravimetric (TG) analyses, X-ray photoelectron spectroscopy (XPS), and single- crystal X-ray diffraction. Compound 1 is a neutral molecule and consists of a di-VV substituted Lindqvist-type polyanion [V₂W₄O₁₉]4−, two supporting copper cations [Cu(2,2′-bipy)₂]2+ and one free 4,4′-bipy. Neutral molecules of 1 are extended to a 2-D grid-like network by π-π stacking interactions between pyridine groups. The molecular structure of 2 contains one [W₆O₁₉]2− cluster polyanion and a [Co(2,2′-bipy)₃]2+. Inductively coupled plasma (ICP) analysis and XPS spectrum of 1 prove the presence of VV. TG curves of 1 and 2 indicate two weight loss steps.View full textDownload full textKeywordsHydrothermal synthesis, Lindqvist anion, Polyoxometalates, Crystal structureRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/00958970903030761