title: Rational synthesis and characterization of the mixed-metal organometallic polyoxometalates [Cp*Mo(x)W(6-x)O18]- (x = 0, 1, 5, 6).
abstract: The reaction between the oxometallic complexes Cp*(2)M(2)O(5) and Na(2)M'O(4) (M, M' = Mo, W) in a 1:10 molar ratio in an acidic aqueous medium constitutes a mild and selective entry into the anionic Lindqvist-type hexametallic organometallic mixed oxides [Cp*Mo(x)W(6-x)O(18)](-) [x = 6 (1), 5 (2), 1 (3), 0 (4)]. All of these compounds have been isolated as salts of nBu(4)N(+) (a), nBu(4)P(+) (b), and Ph(4)P(+) (c) cations and two of them (1 and 3) also with the n-butylpyridinium (nBuPyr(+), d) cation. The compounds have been characterized by elemental analyses, thermogravimetric analyses, electrospray mass spectrometry, and IR spectroscopy. The molecular identity and geometry of compounds 1c, 2a, and 2c have been confirmed by single-crystal X-ray diffraction. Density functional theory calculations on models obtained by replacing Cp* with Cp (I-IV) have provided information on the assignment of the terminal M═O and bridging M-O-M vibrations.
authors.affiliation: CNRS, Laboratoire de Chimie de Coordination, 205 route de Narbonne, BP 44099, F-31077 Toulouse Cedex 4, France.
authors.forename: Gülnur
authors.initials: G
authors.lastname: Taban-Çalışkan
authors.forename: Daniel
authors.initials: D
authors.lastname: Mesquita Fernandes
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Daran
authors.forename: Dominique
authors.initials: D
authors.lastname: Agustin
authors.forename: Funda
authors.initials: F
authors.lastname: Demirhan
authors.forename: Rinaldo
authors.initials: R
authors.lastname: Poli