Stabilization of tetrameric metavanadate ion by tris(110-phenanthroline)cobalt(III): Synthesis spectroscopic and X-ray structural study of Co(phen)33(V4O12)2Cl·27H2O

摘要

A new complex salt of composition [Co(phen)3]3(V4O12)2Cl·27H2O (phen = 1,10-phenanthroline and [V4O12]^4- = tetrameric dodecaoxotetravanadate ion) was synthesized by reacting appropriate salts in aqueous medium. The complex salt has been characterized by elemental analyses, thermogravimetric analysis (TGA), cyclic voltammetry (CV), FT-IR and UV/Vis spectroscopies, solubility product and conductance measurements. Single crystal X-ray structure determination revealed ionic structure consisting of three complex cations, [Co(phen)3]³⁺, two [V4O12]^4- anions, one chloride and twenty seven lattice waters. Detailed structural and spectroscopic analyses of [Co(phen)3]3(V4O12)2Cl·27H₂O show that the large anion is stabilized by the large cationic metal complex as there is preferred shape compatibility that leads to a large number of lattice stabilizing non-covalent interactions.