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Figure 7. Transient absorption difference spectrum recorded 10 µs
after laser flash for the reaction of 3* and 4-(methoxycarbonyl)-N-
methylpyridinium in degassed acetone.
noformyl)-N-methylpyridinyl radicals are estimated to be 9.7
× 109 and 2.1 × 1010 dm3 mol-1 s-1, respectively.
In conclusion, characteristic pyridinyl radical absorptions have
been observed in all transient absorption difference spectra
studied, thus providing direct spectroscopic evidence for the
electron-transfer nature of the photoreactions between the
phosphorescent states of these tetranuclear copper(I) chalco-
genide clusters and the pyridinium acceptors. The highly
reducing capabilities of the excited states of these copper(I)
clusters have also been demonstrated.
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Acknowledgment. V.W.-W.Y. acknowledges financial sup-
port from the Research Grants Council and The University of
Hong Kong, K.K.-W.L. the receipt of a Sir Edward Youde
Postgraduate Fellowship, administered by the Sir Edward Youde
Memorial Fund Council, and a Postgraduate Studentship,
administered by The University of Hong Kong, and C.-R.W.
the receipt of a Postdoctoral Fellowship, also administered by
The University of Hong Kong.
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