Bromido[1-(η-4-tert-butyl-benz-yl)-3-(2,4,6-trimethyl-benz-yl)benzimidazol-2-yl-idene]chloridoruthenium(II)

1-(1H-Benzimidazol-1-ylmethyl)-3-[2-(diisopropylamino)ethyl]-1H-benzimidazolium bromide 0.25-hydrate

The title N-heterocyclic carbene derivative, C₂₃H₃₀N₅⁺·Br⁻·0.25H₂O, was synthesized using microwave heating and was characterized by ¹H and ¹³C NMR spectroscopy and a single-crystal X-ray diffraction study. The structure of the title compound are stabilized by a network of intra- and inter­molecular C—H⋯Br hydrogen-bonding inter­actions. The crystal structure is further stabilized by π–π stacking inter­actions between benzene and imidazole fragment rings of parallel benzo[d]imidazole rings, with a separation of 3.486 (3) Å between the centroids of the benzene and imidazole rings. There is also an inter­molecular C—H⋯π inter­action in the crystal structure. The C—N bond lengths for the central benzimidazole ring are shorter than the average single C—N bond, thus showing varying degrees of double-bond character and indicating partial electron delocalization within the C—N—C—N—C fragment. The isopropyl group is disordered over two sites with occupancies of 0.792 (10) and 0.208 (10).