Full article: The Reaction between MoO3 and Molten K2S2O7 forming K2MoO2(SO4)2: Studied by Raman and IR Spectroscopy and X-Ray Crystal Structure Determination

Thomas Nørbygaard, Rolf W. Berg, Kurt Nielsen

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The reaction between molybdenum trioxide and molten potassium pyrosulfate was shown by Raman spectroscopy at 430 oC to be a 1:1 reaction. By tempering of the compound, colorless crystals could be formed. The structure was determined; crystal data: Space group = P21/c, Z = 4, a = 9.0144(3), b = 12.4540(4), c = 8.8874(3) Å, beta = 112.194(1)o, wR2 = 0.0897 for 3491 independent reflections. The compound, K2MoO2(SO4)2, contains (Mo02)2+ core ions in distorted octahedral coordination, with two short (ca. 1.69 Å) terminal bonds in cis-configuration (the O-Mo-O angle is 103.1(2)o), and with two long (ca. 2.18 Å) bonds in trans-position to the short ones, and with two bonds of intermediate (ca. 2.01 Å) length, all four bridging oxygens belonging to different sulfato groups. The K+ ions are placed in between strands of Mo06 octahedra, connected along the c-axis by two different kinds of bridging sulfato groups. Bond distances and angles are compared with literature values. Empirical correlations between bond distances and bond orders and bond order sums (approximating oxidation states) are given for all atoms. IR and Raman spectra were obtained and tentatively assigned.
Original languageEnglish
Title of host publicationProceeding of the Eleventh International Symposium on Molten Salts XI
Place of PublicationPennington, New Jersey, USA
PublisherThe Electrochemical Society
Publication date1998
Publication statusPublished - 1998
EventProceeding of the Eleventh International Symposium on Molten Salts - San Diego, California, U.S.A
Duration: 1 Jan 1998 → …


ConferenceProceeding of the Eleventh International Symposium on Molten Salts
CitySan Diego, California, U.S.A
Period01/01/1998 → …

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