Crystal and molecular structure of antimony trifluoride–terpyridine 1 : 1 adduct: a case of pseudo-pentagonal-bipyramidal geometry

Abstract

The crystal structure of SbF₃(terpy)(terpy = 2,2′:6′2″-terpyridine) has been determined: monoclinic, space group P2₁/c, with a= 12.511(2), b= 14.132(3), c= 17.106(3)Å, β= 105.10(1)°; R= 0.0434. The asymmetric unit contains two independent molecules which show only small differences: each contains a terpy molecule, two fluorines nearly accommodated in a plane and a fluorine at the apical site of a pseudo-pentagonal-bipyramidal arrangement in which the seventh position is occupied by the antimony lone pair.