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Thermal Decomposition of Ammonium Paratungstate Tetrahydrate Traced by In Situ UV/Vis Diffuse Reflectance Spectroscopy
Author(s) -
Fait Martin J. G.,
Lunk HansJoachim
Publication year - 2012
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201100838
Subject(s) - tetrahydrate , chemistry , diffuse reflectance infrared fourier transform , diffuse reflection , tungsten , octahedron , ammonium , inorganic chemistry , transition metal , ion , thermal decomposition , spectroscopy , photochemistry , crystallography , analytical chemistry (journal) , crystal structure , photocatalysis , organic chemistry , quantum mechanics , optics , catalysis , physics
In situ UV/Vis diffuse reflectance spectra of ammonium paratungstate tetrahydrate at increasing temperatures were recorded in oxidative as well as in reductive atmospheres. From the edge energy of the ligand‐to‐metal charge transfer transition of tungsten ions, the number of bridging W–O–W bonds, N , was determined. The increase of N with temperature indicates a stepwise enhancement of the condensation of WO 6 octahedra to finally form WO 3 in an oxidative atmosphere.