Supplementary Material Available: Tables of coordinates and isotropic thermal parameters for hydrogen atoms and anisotropic thermal parameters (2 pages); listings of observed and calculated structure factors (14 pages). Ordering information is given on any current masthead page.

The title compound, [ C ~( d p p ) ~]+ (dpp = 2,9-diphenyl-I ,I 0-phenanthroline), exhibits long-lived emission at room temperature in solution, and, in contrast with copper(1) complexes of less bulky ligands, the emission persists in polar media; a water soluble derivative of [Cu(dpp),]+ is luminescent a t room temperature in aqueous solution and undergoes efficient redox photochemistry in the presence of electron acceptors.

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In Table 1, the room-temperature lifetimes for [ C u ( d ~p ) ~] + and [Cu(tpp)2]+ are incorrect and should be 240 and 190 ns, respectively. The quantum yields are also incorrect and should be as follows: [ C ~( d m p ) ~] + 2.1 x [ C ~( d p p ) ~] + 8.0 x [Cu(bcp)J+ 2.5 X and [ C ~( t p p ) ~] + 10.0 x