Abnormal binding in a carbene complex formed from an imidazolium salt and a metal hydride complex

2-Pyridylmethylimidazolium salts and IrH5(PPh3)(2) give an [(N-C) IrH2(PPh3)(2)](+) species with the imidazole ring bound in the 'wrong way': at C-5, not at the expected C-2.