Angewandte Chemie International Edition
© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Cover Picture (Angew. Chem. Int. Ed. Engl. 11/1997)
The cover picture shows the intense yellow luminescence that is triggered when crystals of the trinuclear gold(I) complex [Au3(CH3-COCH3)3] come in contact with a drop of solvent. The prerequisite for this solvent-stimulated luminescence is the prior irradiation with long-wavelength UV light. This luminescence was totally unexpected, and was first discovered during the isolation of the complex when the resulting crystals were filtered and subsequently washed. The two emission spectra clearly reveal that the yellow luminescence (lower right spectrum) cannot arise from the dissolved species (upper left spectrum). Investigations into the origins of this phenomenon are reported by A. L. Balch et al. on pages 1179ff.