Synthesis and structure of well-defined tricarbonyl iron(0) complexes with multivinylsilicon ligands

In this paper the synthesis of new iron(0) carbonyl complexes with π-bonded ligands containing at least two silicon-vinyl groups of formula [Fe(CO)3L] and [{Fe(CO)3}2L′] are described. The synthesis is done via UV light initiated substitution of carbonyl ligands in [Fe(CO)5] or [Fe2(CO)9] precursors by organosilicon dienes, trienes, vinyl functional silicones (L), tetraenes (L′). The spectroscopic study (1H and 13C NMR) and X-ray analysis of these novel complexes showed that they are all 5 coordinate exhibiting two geometric environments, i.e. trigonal bipyramidal or tetragonal pyramidal.