Abstract
A hitherto unprecedented polynuclear phosphinine-Cu(I) complex has been prepared and crystallographically characterized. The molecular structure in the crystal verifies the presence of the heterocubanetype tetrameric cluster [LCuBr]4 (L = 2,4-diphenyl-5-methyl-6-(2,3- dimethylphenyl)phosphinine), which unexpectedly shows in the solid state temperature-independent orange phosphorescence solely from an 3XMLCT state, in clear contrast to
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