Hydrogen bonding in imidazolium nitrates [1]

Abstract

The imidazolium nitrates [ImH](NO3) (1) and [ImBr](NO 3) (2) are obtained from the corresponding bromides [ImH]Br (3) and [ImBr]Br (4) and AgNO3 in excellent yields (Im = 2,3-dihydro-1,3- diisopropyl-4,5-dimethylimidazol-2-ylidene). The crystal structures of 1 and 2 consist of infinite linear chains of ions linked by H⋯O and Br⋯O contacts. In addition, stacks consisting of imidazolium and nitrate ions in the sequence ImBr/NO3/ImBr/NO3⋯ with parallel orientation of their plains are detected in 2. The crystal structure of 3 is also reported.