Record Details

Synthesis, spectral and structural characterization of organic ammonium paratungstates

NOPR - NISCAIR Online Periodicals Repository

View Archive Info
 
 
Field Value
 
Title Synthesis, spectral and structural characterization of organic ammonium paratungstates
 
Creator Morajkar, Sudesh M
Srinivasan, Bikshandarkoil R
 
Subject Tetraoxidotungstate
Organic amine
Paratungstate
Raman spectra
Crystal structure
 
Description 185-195
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.
 
Date 2021-02-11T07:01:46Z
2021-02-11T07:01:46Z
2021-02
 
Type Article
 
Identifier 0975-0975(Online); 0376-4710(Print)
http://nopr.niscair.res.in/handle/123456789/56203
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJC-A Vol.60A(02) [February 2021]