Chemistry of mercaptopyridines and related ligands: Part II-ESR and other studies of the new mixed-ligand complexes of iron (III) with 2(1H)-pyridinethione-S and tertiary phosphine ligands

Abstract

The reaction of 2(1H)-pyridinethione-S(HpyS) with iron (III) chloride/bromide gives complexes of the type, FeX₃(HpyS)_1.5, which on subsequent reactions with a series of phosphorus ligands such as Ph₃P, Ph₃PO, Ph<sub >2</sub>P(CH<sub >2</sub>)<sub >m</sub>PPh<sub >2</sub> and Ph<sub >2</sub>P(O)(CH<sub >2</sub>)<sub >m</sub>P(O)Ph<sub >2</sub> (m= 1, 2) in ethanol-chloroform mixture give the mixed ligand complexes, FeX3(HpyS)Ln [X = CI, Br; <i>n </i>= 2 for L = Ph<sub >3</sub>P, Ph<sub >3</sub>P O and <i>n </i>= 1 for bidentate ligands]. All these compounds have been characterized on the basis of analytical data, conductivity measurements, IR, far IR, UV-VIS and X-band ESR spectral data. Possible structures are suggested.