Intensely luminescent gold(i) phosphinopyridyl clusters: visualization of unsupported aurophilic interactions in solution.

Gold(i) phosphinopyridyl clusters [Au9(PNC)6](BF4)3 (1) and [Au11(PNC)6(PPh3)2](BF4)5 (2) (PNC = 2-diphenylphosphinopyridyl monoion) are assembled. In contrast to the green luminescence of 1, 2 is brightly orange emissive in CH2Cl2, which shows the presence of unsupported AuI-AuI interactions in solution. Besides, 1 and 2 can selectively light up the mitochondria of living cells.

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