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Title: Convenient synthesis and Raman spectral characterization of diammonium monomolybdate(VI)
Authors: Morajkar, Sudesh M
Srinivasan, Bikshandarkoil R
Keywords: Diammonium monomolybdate(VI);Ammonium heptamolybdate tetrahydrate;Grinding;Ammonium bicarbonate
Issue Date: Dec-2020
Publisher: NISCAIR-CSIR, India
Abstract: A convenient and cost-effective method is reported for the preparation of gram quantities of an ammonium-rich Mo compound viz. diammonium monomolybdate(VI) (NH4)2MoO4 (1). The process involves a thorough grinding of a commercial sample of ammonium heptamolybdate tetrahydrate (NH4)6[Mo7O24]·4H2O with an excess of ammonium bicarbonate followed by thermal treatment. The facile formation of (1) is confirmed by its characteristic Raman spectrum. The use of Raman spectroscopy to distinguish between tetrahedral monomolybdate(VI) and heptamolybdate, dichromate and monochromate(VI), paratungstate and monotungstate(VI) as well as the identification of the species present in ammoniacal solutions of MO3 (M = Cr, Mo, W) are reported.
Page(s): 1760-1767
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.59A(12) [December 2020]

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