Benzo[h]quinoline(bhqH) is metallated with iridium(III) to give [Ir(bhq)2Cl]2 in which bhq is coordinated at 1-N and 10-C atoms. This complex reacts with a ligand(L) such as tri-n-butylphosphine and diethylsulfide to yield [Ir(bhq)2ClL].
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Matsuo Nonoyama (1974) studied this question.