A study on the reactivity of cobalt, copper and zinc complexes of 2-methylpyridine-N-oxide towards sulfur dioxide
作者:M. Fondo、M.R. Bermejo、A. Sousa、J. Sanmartín、M.I. Fernández、C.A. McAuliffe
DOI:10.1016/s0277-5387(97)00387-2
日期:1998.1
A series of complexes of general formula M(2-PyCO)(n)X-2(H2O)(m) (M = Co, Cu, Zn; 2-PyCO = 2-methylpyridine-N-oxide, n = 1-2, X = Cl, Br, I and NO3 and m = 0-1) has been prepared and characterised. The reactivity of these complexes with sulfur dioxide has been investigated in the solid state and in toluene slurries at room temperature. The effect of temperature on the ability of these-complexes to hx SO2 has been studied by thermogravimetrical analysis (TGA); the temperature range of study depending critically on the melting point of the initial precursors. The same technique has been used to study the reversibility of the reaction with sulfur dioxide.The amount of sulfur dioxide fixed is dependent on the metal, the anion, the medium of the reaction and the temperature. In general, an increase in temperature results in a decrease in the reactivity of the metal precursors with SO2 but the complexes of copper halides show that an increase in temperature favours the reaction. This is quite interesting behaviour not previously reported. (C) 1998 Elsevier Science Ltd. All rights reserved.