Au⋅⋅⋅Au interactions between the gold(I) centers arranged in a planar rhomboidal array in a novel class of luminescent tetranuclear gold(I) alkynylcalix[4]crown-6 complexes (see picture) give rise to rich luminescence behavior, with long-lived excited states and relatively high luminescence quantum yields.
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Yip et al. (2004) studied this question.
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