rmogravimetric studies of lanthanide complexes with some razoxane S dyes

ABSTRACT

Olid complexes of four derivatives of azoxine S with lanthanide metel ions were prepared and characterized by elemental and thermogavimetric analyses. The proposed formula of these complexes is [ML[2]-OH [H[2]O][n] EtoH] x H[2]o where HL=azoxine S dyes, n=o-3, x= 0-4 and M= trivalent lanthanide ion. TG gave information about the water of hydration, coordination chemistry and thermal stability of these complexes and a general mechanism for their thermal decomposition is suggested. A coordination number of 9 is proposed for the lanthanide metal ions in these complexes, this decreasing to 6 in the heavier lanthanide complexes