G. Valle et R. Ettorre, BIS(4-BROMOIMIDAZOLIUM) TETRACHLOROPALLADATE(II), Acta crystallographica. Section C, Crystal structure communications, 50, 1994, pp. 1221-1222
The structure consists of discrete C3H4BrN2+ and PdCl42- ions in a net
work of N-H... Cl hydrogen bonds. Bond lengths and angles for the imid
azolium ring do not change appreciably upon halogenation.