SYNTHESIS, CHARACTERISATION AND CRYSTAL STRUCTURE OF PYRIDINIUM TETRAMOLYBDATE

Marek Michalec, Wieslaw Lasocha

Faculty of Chemistry, Jagiellonian University, 30-060 Kraków, Poland
michalec@trurl.ch.uj.edu.pl

Keywords: pyridinium molybdates, powder diffractometry, structure determination

Investigation of the pyridine hydrochloride - molybdenic acid - water system has been performed and few pyridinium molybdates have been isolated [1]. One of them; pyridinium tetramolybdate (C₅H₅N)₂ Mo₄O₁₃ (very briefly described in literature [2]) crystallises as very fine powder and can be characterised by powder diffraction method only.

The pyridinium tetramolybdate crystallises in orthorhombic system with lattice parameters: a=15.421, b=18.999, c=7.646 A, V=2240.17 A³. Results of crystal structure studies based on conventional powder data will be presented and compared with the results of complementary techniques e.g. IR, RS, DTG.

1. Michalec, W. Lasocha, S. Hodorowicz, Meeting of Polish Chemical Society (PTChem), Warszawa, 1996.
2. M. McCarron, J. F. Whitney, D. B. Chase: Inorg. Chem. 23 (1984), 3275 -3279