1-Benzyl-3-methyl-imidazolium bromide.

The title compound, (BenzMIm)Br (BenzMIm=1-benzyl-3-methyl-imidazo-l-ium), C 11 H 13 N 2 + ·Br - , was obtained as single crystals directly from a pure and liquid sample of the compound over several weeks. The mol-ecular structure of (BenzMIm)Br consists of separated bromide anions and 1-benzyl-3-methyl-imidazolium cations connected via short C-H⋯Br contacts. The compound exhibits a relatively low melting point (m.p. = 72°C) and is a supercooled, highly viscous transparent liquid at ambient conditions. The title compound crystallizes with two unique ion pairs in the asymmetric unit of the orthorhombic unit cell.