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The bimetallic copper(I) complex Cu 2 L 2 (cis-1) is formed with high diasteroselectivity from [Cu(NCCH 3 ) 4 ][BF 4 ] and HL (4-tert-butyl phenyl(pyrrolato-2-yl-methylene)amine) in a kinetically controlled reaction. cis-1 features a rather short Cu···Cu distance of 2.4756(6) Å and is weakly emissive at room temperature in solution. Oxidatively triggered disproportionation of cis-1 yields elemental copper and the mononuclear copper(II) complex CuL 2 (trans-2). One-electron reduction of trans-2 gives cuprate [2] - with a bent bis(pyrrolato) coordinated copper(I) entity. The imine donor atoms of [2] - can insert an additional copper(I) ion giving exclusively the bimetallic complex cis-1 closing the oxidation-elimination-reduction-insertion cycle.

Photochemistry and Redox Chemistry of an Unsymmetrical Bimetallic Copper(I) Complex