Original scientific paper

Synthesis and Characterizationof New Molybdenum(VI) Oxalate Complexes. CrystalStructure of Tetramethylammonium Salt of μ-Oxo-diaquadioxalatotetraoxodimolybdenum(VI)

Marina Cindrić orcid.org/0000-0003-3062-9902 ; Laboratory of General and Inorganic Chemistry, Chemistry Department, Faculty of Science, University of Zagreb, Ul. kralja Zvonimira 8, P.O. Box 153, 10001 Zagreb, Croatia
Neven Strukan ; Laboratory of General and Inorganic Chemistry, Chemistry Department, Faculty of Science, University of Zagreb, Ul. kralja Zvonimira 8, P.O. Box 153, 10001 Zagreb, Croatia
Višnja Vrdoljak ; Laboratory of General and Inorganic Chemistry, Chemistry Department, Faculty of Science, University of Zagreb, Ul. kralja Zvonimira 8, P.O. Box 153, 10001 Zagreb, Croatia

Abstract

In the reaction of molybdenum(VI) oxide with oxalic acid and RCl(R = pyH and -picH), new dinuclear complexes of molybdenum(VI)R2 Mo2O5(C2O4)2(H2O)2 have been prepared. When molybdenum(VI)oxide was treated with aqueous solution of tetramethylammoniumoxalate complex, (CH3)4N 2 MoO3(C2O4) H2O was isolated. Theunknown crystal structure of (CH3)4N 2 Mo2O5(C2O4)2(H2O)2 wasdetermined from single crystal diffractometer data and refined to thefinal R value of 0.0317. When irradiated, this class of compoundsshows considerable photochromic properties. The photochemicalprocess is of the redox type: molybdenum(VI) centers are reduced tomolybdenum(V) moieties. The presence of molybdenum(V) specieswas confirmed by the ESR spectra.

Keywords

molybdenum(VI) complexes; oxalate complexes; photochemical behaviour; crystal structure

Hrčak ID:

132229

URI

https://hrcak.srce.hr/132229

Publication date:

1.9.1999.

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