Cyclometallation of bis-benzimidazole derivatives with rhodium(III) halides

Add time:09/01/2019    Source:sciencedirect.com

Treatment of rhodium(III) halides with the N-heterocycles (LH), 1,3-bis(benzimidazolyl)benzene (bBzlH2bzH; Ia) and its N-methyl derivative (bBzlMe2bzH; Ib) in methanol gave halobridged binuclear cyclometallated products of the composition [RhX2L]2 (X=Cl, Br or I). The chloro complex undergoes halobridge cleavage reactions to yield several new mononuclear complexes of the types RhCl2(bBzlH2bz)(AsPh3), RhCl(bBzlH2bz)(OClO3)(L′/N-N) (L′=AsPh3; N-N=2,2′-bipyridine or 1,10-phenanthroline) and the heterocycle bridged binuclear complexes of the composition [RhCl2(bBzlH2bz)]2(μ-N-N) (N-N=pyrazine or 4,4′-bipyridine). Passage of CO through [RhCl2(bBzlH2bz)]2 in DMF yielded mononuclear carbonyl complex RhCl2(CO)(bBzlH2bz)·2H2O. Treatment of carbonylated solution of rhodium trichloride with Ia produced non-cyclometallated mononuclear complex of the type [Rh(CO)2(bBzlH2bzH)]Cl. The complexes are characterised by 1H, 13C NMR, IR, Far-IR, electronic and FAB-mass spectral studies.

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