A transition-metal-templated 3-D supramolecular framework based on molybdenum-vanadium polyoxoanions

摘要

A polyoxometalate [Co(phen)_3][Co(en)_3][Co(en)_2(H_2O)_2][Co(en)_2]_(0.5)[PMo_8~(VI)VI_4~VO_(40)(V~(IV)O)_2] · 6H_2O (1) (en = ethylenediamine, phen= 1,10-phenanthroline) has been hydrothermally synthe-sized and structurally characterized by single-crystal X-ray diffraction, 1R, electron para-magnetic resonance, X-ray photoelectron spectroscopy, elemental analyses, and thermogravimetry. The structure is an interesting 3-D supramolecular network containing bi-capped Keggin-type molybdenum—vanadium clusters with transition metal complexes generated in situ under mild hydrothermal conditions. Compound 1 contains four different counteractions being coordinated complexes of cobalt. The magnetic properties of 1 have also been studied in the temperature range of 4—300 K, and its magnetic susceptibility obeys the Curie-Weiss law, showing ferromagnetic coupling.