The crystal structure and the disorder behaviour of NO[NbCl6]

Abstract

Abstract NO[NbCl6] crystallizes in the noncentrosym metric space group P212121 with a = 6.630(1), b = 6.746(1), c = 39.23(1) Å at 150 K and Z = 8; i.e. there are two formu la units in the asymmetric unit. X-ray data have been re corded by means of an imaging plate system. The interaction between the nitrosonium cations and the hexachloridoniobate anions polarizes the latter such that the niobium atoms are displaced from the centre of their chlorine polyhedra by 0.17 and 0.16 Å, respectively. The NO+ ions develop disorder, in both cases with preference for one out of two possible orientations.