title: Organic-Inorganic Hybrids Based on Polyoxometalates. 5.(1) Synthesis and Structural Characterization of Bis(organophosphoryl)decatungstosilicates [gamma-SiW(10)O(36)((RPO)(2)](4)(-).
abstract: Organophosphoryl polyoxotungstate derivatives [gamma-SiW(10)O(36)(RPO)(2)](4)(-) (R = H (1), Et (2), n-Bu (3), t-Bu (4), C(2)H(4)COOH (5), Ph (6)) have been obtained by reaction of the divacant [gamma-SiW(10)O(36)](8)(-) anion with organophosphonic acids RPO(OH)(2) in acetonitrile. These new heteropolyanions have been characterized by elemental analysis, infrared spectroscopy, multinuclear ((1)H, (29)Si, (31)P, and (183)W) NMR, and X-ray crystallography. Crystals of (NBu(4))(2)(NEt(4))H[gamma-SiW(10)O(36)(C(6)H(5)PO)(2)] (anion 6) are monoclinic, space group P2(1), with lattice constants a = 16.489(4) Å, b = 14.016(3) Å, c = 18.542(8) Å, beta = 91.30(3) degrees, and Z = 2. The hybrid anion has a structure of virtual C(2v)() symmetry with two phenylphosphonate groups grafted to the surface of the divacant tungstosilicate. (183)W and (31)P NMR spectra of NBu(4) salts in DMF solution agree with the solid-state structure and the virtual C(2)(v)() symmetry.
authors.affiliation: Laboratoire de Chimie Inorganique et Matériaux Moléculaires, Unité CNRS 7071, case courrier 42, Université Pierre et Marie Curie, 4 place Jussieu, F75252 Paris Cedex 05, France.
authors.forename: Cédric R.
authors.initials: CR
authors.lastname: Mayer
authors.forename: Patrick
authors.initials: P
authors.lastname: Herson
authors.forename: René
authors.initials: R
authors.lastname: Thouvenot