NMR study of the photochemical reaction of (η 5-C 5H 5)Fe(CO) 2Me with P, As, Sb, S and N donor ligands

Abstract

The photochemical reaction of (η 5-C 5H 5)Fe(CO) 2Me with E(C 6H 5) 3 (E = P, As, Sb) has been studied quantitatively in situ by NMR spectroscopy and the rate of reaction, as monitored by η 5-C 5H 5 and Me resonances, determined as a function of ligand, ligand concentration, solvent, wavelength and likely competing reactions. The product at temperatures above 27°C was found to be (η 5-C 5H 5)Fe(CO)(Me)E(C 6H 5) 3 in all cases and rate plots showed that the rate-determining step did not involve the ligand E(C 6H 5) 3 and also that an acetyl complex was not involved as an intermediate. The photoreaction may be considered as: ▪ Qualitative NMR studies showed that C 5H 5N, (C 2H 5) 2S, and o-phenylenebis(dimethylarsine) gave products of the type (η 5-C 5H 5)Fe(CO)(Me)L in photochemical reactions.