Abstract
Electrical rectification by a Langmuir-Blodgett monolayer of y-hexadecylquinolinium tricyanoquinodimethanide, C 16 H 33 Q-3CNQ, 1 has been verified first between Al electrodes, then between Au electrodes: this rectification arises from the asymmetry of the molecule, and the interplay between the zwitterionic ground state D + -π-A - and the less dissociated first electronic excited state D 0 -π-A 0 . Two more rectifiers have been found. 2,6-Di[dibutylamino-phenylvinyl]-1-butylpyridinium iodide, (Bu 2 NφV) 2 BuPy + I - , 2 is an interionic rectifier which involves back charge transfer between the iodide ion and the pyridinium ring. Dimethylanilino-aza[C 60 ]fullerene, DMAn-NC 60 , 3, has a rectification ratio close to 2.
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