Mössbauer and Infrared Spectroscopic Studies of Some Alkyl- and Arylamine Coordinated Pentacyanoferrate(II) Complexes

Abstract

Abstract Mössbauer spectra of alkyl- and arylamine coordinated pentacyanoferrate(II) complexes, Na3[Fe(CN)5L]·xH2O where L=(CH3)3N, (CH3)2CHNH2, (CH3)2CHCH2NH2, (CH3)3C–NH2, C6H5NH2, C6H5NHCH3, C6H5N(CH3)2, C6H5NHC2H5, o-ClC6H4NH2, and p-ClC6H4NH2 have been studied. All compounds exhibit a well-resolved quadrupole doublet. An unusually high quadrupole splitting is observed for isobutylamine coordinated complex (ΔEQ=1.75 mm s−1). Other complexes show ΔEQ=0.67–0.86 mm s−1. A correlation of δ vs. ΔEQ suggests a positive sign of electric field gradient for isobutylamine coordinated complex and negative for all other complexes. Partial isomer shift (p.i.s.) and δ have been correlated with partial quadrupole splitting (p.q.s.). Also characteristic CN and Fe–N stretching frequencies have been correlated with δ to derive information on σ-donor and π-acceptor properties of the ligands.