title: Rare Neutral Diphosphine Complexes of Scandium(III) and Yttrium(III) Halides.
abstract: Reaction of Me2PCH2CH2PMe2or o-C6H4(PMe2)2(L-L) with a suspension of ScI3or YI3in MeCN solution under rigorously anhydrous and oxygen-free conditions produced the highly unusual complexes [ScI3(L-L)2], [YI3(Me2PCH2CH2PMe2)2], and [YI3{o-C6H4(PMe2)2}2MeCN]. X-ray crystal structures reveal that the scandium complexes adopt seven-coordinate, pentagonal-bipyramidal geometries with chelating diphosphines, while the eight-coordinate [YI3{o-C6H4(PMe2)2}2MeCN] is dodecahedral. The complexes were characterized by microanalysis and IR and multinuclear NMR spectroscopy. Solid-state NMR data (45Sc,89Y,31P) and variable-temperature solution NMR data (1H,31P{1H},45Sc) are presented and compared, leading to the conclusion that the same species are present in both the solid state and CH2Cl2solution. Attempts to prepare complexes with other scandium halides and with aryl diphosphines and o-C6H4(AsMe2)2are briefly described.
authors.affiliation: School of Chemistry, University of Southampton , Highfield, Southampton SO17 1BJ, U.K.
authors.forename: Marina
authors.initials: M
authors.lastname: Carravetta
authors.affiliation: School of Chemistry, University of Southampton , Highfield, Southampton SO17 1BJ, U.K.
authors.forename: Maria
authors.initials: M
authors.lastname: Concistre
authors.affiliation: School of Chemistry, University of Southampton , Highfield, Southampton SO17 1BJ, U.K.
authors.forename: William
authors.initials: W
authors.lastname: Levason
authors.affiliation: School of Chemistry, University of Southampton , Highfield, Southampton SO17 1BJ, U.K.
authors.forename: Gillian
authors.identifier: http://orcid.org/0000-0001-5349-3468
authors.initials: G
authors.lastname: Reid
authors.affiliation: School of Chemistry, University of Southampton , Highfield, Southampton SO17 1BJ, U.K.
authors.forename: Wenjian
authors.initials: W
authors.lastname: Zhang