Synthesis and characterisation of dioxooxalatofluorovanadates (V)

Abstract

Dioxooxalatofluorovanadates (V), M1/2[VO₂(C₂)₄)F], where M = Na⁺, K⁺, NH<img src="http://www.niscair.res.in/jinfo/plusfour.gif" alt="" border="0" />, 1/2Ni²⁺, 1/3Co(NH₃) <img src="http://www.niscair.res.in/jinfo/equation142.gif" alt="" border="0" /> and 1/3Co(en (en= ethylenediamine) have been isolated and characterized. Molar conductivity of K₂[VO₂(C₂O₄)F] at different dilutions indicates that it dissociates primarily into 2K⁺ and [VO₂(C₂O₄)F]^2- ions. IR data reveal the presence of chelated oxalate group. A strong band in the IR spectra of the compounds at 350-360 em -1 suggests their polymeric nature and existence of -V-F-V-chains. The TGA data of potassium and cobaltammine complexes reveal their decomposition around 80°C.