MANGANESE(II) COMPLEXES CONTAINING POLYSTYRYL DIPHENYLPHOSPHINE OXIDEAS LIGAND AND THEIR REACTIVITY WITH SULFUR-DIOXIDE

The ligand polystyryl diphenylphosphine oxide (L) and several manganes e(II) complexes with empirical formulae MnL(m)X(2) . nH(2)O and MnL(m) SO(4) .3H2O (m=2, 3; n=1-4; X=Cl, Br, I, NCS, NO3) have been synthesis ed and characterised. The absorption of sulfur dioxide by these comple xes has been examined in the solid state, at room temperature and in t he 230-30 degrees C temperature range, and also in SO2-saturated tolue ne suspensions. After the interaction between sulfur dioxide and metal lic complexes some air-stable SO2 adducts of accurate formulae could b e isolated. Nitrate complexes appear to exhibit distinct behaviour due to an additional reaction with SO2; viz. nitrate ions appear to be re placed by sulfate ions in the SO2 adducts. Sulfur dioxide desorption w as studied for SO2 adducts by heating at 160 degrees C under reduced p ressure for 1 h or at 300 degrees C for about 15 min at atmospheric pr essure.