Homoleptic Diphosphacyclobutadiene Complexes [M(η4-P2C2R2)2]x− (M=Fe, Co; x=0, 1) (pages 14322–14334)
Dr. Robert Wolf, Dr. Andreas W. Ehlers, Dr. Marat M. Khusniyarov, Prof. Dr. František Hartl, Dr. Bas de Bruin, Prof. Dr. Gary J. Long, Prof. Dr. Fernande Grandjean, Dr. Falko M. Schappacher, Prof. Dr. Rainer Pöttgen, Dr. J. Chris Slootweg, Dr. Martin Lutz, Prof. Dr. Anthony L. Spek and Prof. Dr. Koop Lammertsma
Article first published online: 1 DEC 2010 | DOI: 10.1002/chem.201001913
Fancy a sandwich? Homoleptic sandwich anions that contain diphosphacyclobutadiene ligands result from the reaction of anthracene metalates [Fe(η4-C14H10)2]− and [Co(η4-C14H10)2]− with phosphaalkynes. Electrochemical and preparative investigations of [M(η4-P2C2tBu2)2]− (M=Fe, Co) revealed that these anions are readily oxidized to neutral derivatives [M(η4-P2C2tBu2)2]. The electronic structures of the new sandwich complexes have been elucidated by using spectroscopic techniques and density functional theory calculations.