Thermal decomposition and spectra of some anhydrous and some hydrated metal chloride dioxan adducts

Abstract

The thermal decompositions of MCl₂,DX and MCl₂, DX,2H₂O (M = Ni, Co, Fe, Mn, and Ca; DX = 1,4-dioxan) and of CuCl₂,2DX,2H₂O have been studied by differential enthalpic analysis, thermogravimetry, and ‘dynamic reflectance spectroscopy.’ MCl₂,DX and NiCl₂,DX,2H₂O were converted into MCl₂ in single-stage reactions, for which ΔH values are reported and discussed. MCl₂,DX,2H₂O (M = Co, Fe, Mn, and Ca) disproportionates into MCl₂DX and dioxan-free compounds, which then decompose independently. The new compound CoCl₂,DX,H₂O is reported. The spectra of the hydrated compounds are reported from 45,000 to 238 cm.^–1. These spectra indicate that the compounds contain six-co-ordinate metal ions with water, dioxan, and chloride all acting as ligands.