BINARY AND TERNARY COMPLEXES OF SULFAMETHOXAZOLE

The complex formation equilibria involved in the binary and ternary sy stems M(II)-sulpha and M(II)-phen-sulpha were investigated by potentio metric titrations at 25 degrees C and a ionic strength of 0.1 N NaNO3 (M = Cu, Ni, Co, Zn; sulpha = sulphamethoxazole; phen = phenanthroline ). The stability constants of the binary and ternary complexes follow the order of Irving and William. The formation of the ternary complex is discussed in terms of the binary species. The mode of chelation was ascertained by conductivity measurements.