Substitutions sélectives de carbonyles dans des complexes polynucléaires: IX. Etudes structurales des composés de mono- et disubstitution de CO par le t-butylisonitrile dans un complexe binucléaire non symétrique

Abstract

The structures of the complexes [(μ-η 2-ROC(1)SFe 2L 1L 2(CO) 4(μ-SMe)] (R = 2,4,6-trimethylphenyl) ( 3b: L 1 = t-BuNC,L 2 = CO and 4b: L 1 = L 2 = t-BuNC), obtained by carbonyl substitution in the hexacarbonyl precursor 1b (L 1 = L 2 = CO), have been determined by single-crystal X-ray diffraction. In 3b, the t-BuNC ligand has replaced the axial carbonyl of Fe(1) of 1b, trans to the carbene C(1). In 4b the second t-BuNC ligand has replaced an equatorial carbonyl of Fe(2), trans to the SMe. The structural modifications that arise from carbonyl replacement are analyzed and the 13C NMR data are discussed.