Die rotationsfehlgeordnete Kristallstruktur von Tropyliumbromid C7H7 +Br– / The Rotationally Disordered Crystal Structure of Tropylium Bromide C7H7 +Br−

Abstract

The crystal structure of tropylium bromide, C7H7 +Br−, was solved and refined in space group type R¯3m with rotationally disordered C7 rings. Restraints of identical 1,2- and 1,7-C-C bond lengths as well as identical 1,3- and 1,6-C-C separations within a flat C7H7 moiety were applied. The refinement converged to a regular C7 heptagon with C-C bond lengths of 139.1(1) pm. C7H7 +Br− reacts with Mo(CO)3(CH3CN)3 to form C7H7Mo(CO)2Br.