A trimetallic macrocycle: Starting from nonlinear N-deprotonated benzimidazole and square-planar cyclometalated platinum(II) precursors, cyclic trimers with three metal vertices can be obtained by a general and rational strategy (shown schematically, M=Pt). A complex is formed with 2-(2-thienyl)pyridine as chelating ligand which photoluminesces in solution at room temperature.
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Lai et al. (1999) studied this question.