Abstract
Photoelectric measurements were performed on powder samples of ion-pair complexes of mono- and dianionic nickel and zinc dithiolenes with redox-active cations like 2,2′-and 4,4′-bipyridinium or simple tetraalkylammonium derivatives. From the dependence of the photoconductivity on temperature, applied electric field and wavelength of exciting light it is suggested that charge generation is dominated by optical ion-pair charge transfer (IPCT) from the anion to the cation. Accordingly, low energy photoconductivity maxima appear in the region of the IPCT bands and are shifted linearly to higher energy when, for a given donor like [ZnL 2] 2−, the reduction potential of the acceptor becomes more negative.
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