90. Bimetallic Iridium(III) Complexes Consisting of Ir(ppy)₂ Units (ppy = 2-Phenylpyridine) and Two Laterally Connected N^N Chelates as Bridge: Synthesis, Separation, and Photophysical Properties Bimetallic Iridium(III) Complexes consistin
    Audrey Auffrant, Andrea Barbieri, Francesco Barigelletti, Jérôme Lacour, Pierre Mobian, Jean-Paul Collin, Jean-Pierre Sauvage, Barbara Ventura
    Inorg. Chem. 2007, 46, 6911-6919

The cyclometalated iridium dinuclear complex [(ppy)₂Ir(μ-L)Ir(ppy)₂]²⁺ (1²⁺) has been prepared by reaction of the precursor complex Ir₂(ppy)₄Cl₂ (ppy = 2-phenylpyridine) with the unusual bridging ligand 3,8-dipyridyl-4,7-phenanthroline as a mixture of three diastereoisomers. Ion-pair chromatography with Δ-TRISPHAT anion (TRISPHAT = tris(tetrachlorobenzenediolato)phosphate(V)) as resolving anion permits the separation of the three stereoisomers. The absorption and emission properties of the three stereoisomers show only very small variations. The anisotropic properties can be interpreted as distinct interactions of the isomers with the chiral resolving Δ-TRISPHAT anion.

DOI : 10.1021/ic700494e 

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