A series of luminescent tetranuclear copper(I) and silver(I) chalcogenide complexes have been synthesized and characterized. The photophysical and photochemical properties of these complexes have also been investigated. The long-lived excited state of these luminescent clusters is believed to bear a high parentage of ligand-to-metal charge-transfer LMCT (E2- → M4) character. The assignment has also been supported by molecular orbital calculations.
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Yam et al. (1997) studied this question.
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