title: Semi-vacant Wells-Dawson anions. Synthesis of tri-tungsten-vacant derivatives and crystallographic studies of [alphabetabetaalpha-(Cu(II)OH2)2(Cu(II))2(AsW15(OH2)3(OH)O52)2]12-.
abstract: The tri-tungsten-vacant polyoxometalate, [alpha-AsW15(OH)4O52]13-, derived from the semi-vacant Wells-Dawson complex [alpha-AsW18(OH)4O58]7-, reacts with the late-transition metal cations, Cu(II) or Zn(II), to form sandwich-type species; the X-ray crystal structure of [alphabetabetaalpha]-(Cu(II)OH2)2(Cu(II))2(AsW15(OH2)3(OH)O52)2]12-, prepared by the acidification of [alphabetabetaalpha]-(Cu(II)OH2)2(Cu(II))2(AsW15(OH)4O52)2]18-, reveals that the missing heteroatoms are distal to the central Cu4 unit and the vertices of the vacant tetrahedron are occupied by one OH- and three OH2 groups.
authors.affiliation: Laboratoire de Chimie Physique, UMR 8000, CNRS, Universite Paris-Sud, 91405, Orsay, France.
authors.forename: Israel Martyr
authors.initials: IM
authors.lastname: Mbomekalle
authors.forename: Bineta
authors.initials: B
authors.lastname: Keita
authors.forename: Louis
authors.initials: L
authors.lastname: Nadjo
authors.forename: Kenneth I
authors.initials: KI
authors.lastname: Hardcastle
authors.forename: Craig L
authors.initials: CL
authors.lastname: Hill
authors.forename: Travis M
authors.initials: TM
authors.lastname: Anderson