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Equilibration between three different excited states in a bichromophoric copper(I) polypyridine complex.

Fast reversible energy transfer and intersystem crossing conspire to permit excited-state equilibration between three excited states in a copper(I) phenanthroline complex. Introduction of multiple quasi-isoenergetic excited states in a planned fashion represents a new strategy to prolong luminescence lifetimes of copper phenanthroline complexes (e.g., 1.2 μs compared with 70 ns for the parent complex).