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Title: Synthesis, spectral and structural characterization of organic ammonium paratungstates
Authors: Morajkar, Sudesh M
Srinivasan, Bikshandarkoil R
Keywords: Tetraoxidotungstate;Organic amine;Paratungstate;Raman spectra;Crystal structure
Issue Date: Feb-2021
Publisher: NISCAIR-CSIR, India
Abstract: Dissolution of tungsten(VI) oxide hydrate (WO3·H2O) in aqueous organic amine (RNH2 where R = methyl or ethyl, or n-propyl or isopropyl or n-butyl or t-butyl etc.) results in the formation of the tetrahedral tetraoxidotungstate(VI) species in solution. Slow evaporation of the reaction mixture to isolate the tetraoxidotungstates charge balanced by organic ammonium cations afforded organic ammonium paratungstates having formula (RNH3)10[H2W12O42]·xH2O. The presence of (WO4)2- species in solution and the [H2W12O42]10- unit in the solid product is confirmed by the characteristic Raman spectra. In this paper, we report on the synthesis, Raman spectra, crystal structures and properties of two organic ammonium paratungstates viz. (MeNH3)10[H2W12O42]·12H2O 1 (MeNH2 = methylamine) and (EtNH3)10[H2W12O42]·4H2O 2 (EtNH2 = ethylamine). Thermal decomposition of 1 or 2 at 800 °C results in the formation of monoclinic form of tungsten trioxide WO3. A comparative study of several paratungstates is described.
Page(s): 185-195
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.60A(02) [February 2021]

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