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Abstract
Data for a series of copper(I) phenanthrolines in an alcohol glass at 90 K have revealed that substituents in the 2,9-positions of the ligand have a pronounced influence on the energy, intensity, and lifetime of the photoluminescence. All of the complexes exhibit intense metal-to-ligand charge-transfer absorption bands of similar energy in the visible region. However, the absorption maxima and, to an even greater extent, the emission maxima shift to higher energy as bulkier substituents are introduced. At the same time, the emission quantum yieds and lifetimes increase. The results can be understood in terms of contrasting geometric preferences of the ground and excited states involved
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