Abstract

4, 4′-Bipyridinium salts with tetraphenylborate anion (abbreviated to TPB-) showed charge-transfer (CT) absorption above 365nm and broad structureless CT fluorescence with a maximum at 525nm in 1, 2- dimethoxyethane. The excitation of a CT band (λ>365nm) in vacuo resulted in the persistent colour change and the quenching of CT fluoresence due to the accumulation of 4, 4′-bipyridinium radical cations. These results demonstrated that 4, 4′-bipyridinium TPB- salts can be applied to a photon-mode write-once type (WORM) optical memory.

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