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Spectroscopic analysis reveals near-unity fluorescence yields in copper and silver diborene complexes, indicating suppressed intersystem crossing despite heavy metal spin-orbit coupling.
A number of unprecedented photophysical phenomena were observed in the study of luminescent π-diborene complexes of Cu and Ag. These observations included unusually high fluorescence quantum yields (up to 100%) in solution for complexes of these metals. This result indicates that very little or no intersystem crossing between S1 and T(n) occurs in the complexes, despite the strong spin-orbit coupling of the metal atoms. The replacement of carbon with boron thus yields luminescent isolobal analogues of otherwise non-emissive olefin complexes of Cu and Ag.
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Bissinger et al. (2015) studied this question.
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