Abstract
The (phosphine)- and (N-heterocyclic carbene)gold(I) fragments are isolobal with the proton; they can attach terminally to fluorescent organic molecules in place of hydrogen. A new synthetic protocol, base-promoted transmetallation, has been developed that binds gold(I) to the peripheries of aromatic molecules through direct C–Au σ-bonds. Photophysical investigations indicate that a single gold center induces triplet excited-state behavior. Gold-induced perturbations of an azadipyrromethene chromophore are also discussed; here gold binds through nitrogen. In all instances considered, gold(I) acts as a relativistic functional group that perturbs its ligands' excited state manifolds through spin-orbit coupling.
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