Physico-Chemical Studies on the Mixed Ligand Complexes of Chromium(III) Nitrilotriacetate with Some Phenols and Phenolic Acids

Department of Chemistry, University of Roorkee, Roorkee-247 667 Manuscript received 30 April 1982, revised 25 October 1983, accepted 21 February 1984 On the basis of conductance, polarographic, magnetic, ir and electronic spectral studies, the complexes of the type K2[Cr(NTA)(P)2] and K2[Cr(NTA)(A-A)] (P=deprotonated phenol, 4-chlorophenol, 4-nitrophenol, o- cresol, hydroquinone or\(\propto\)(-naphthol ; A- A=pyrogallol, pyrocatechol, alizarin, salicylic acid, 4-aminosalicylic acid or 4-sulphosalicylic acid) were found to have an octahedral structure. The coordinating power of these phenolic compounds was in the order hydroquinone> 4-nitrophenol> phenol = 4-aminosalicylic acid> 4-chlorophenol =pyrogallol= pyrocatechol = o-cresol =salicylic acid= 4-sulphosalicylic acid> \(\propto\)-naphthol> alizarin