Abstract
The effects of acid and basic vapour phase treatments (AT and BT respectively) have been studied on Langmuir-Blodgett films thicker than 9 monolayers of a merocyanine (DI) and its 6-CH 3, substituted product (DII). Optical measurements indicate that the red-shifted (J-like) band structure, which is dissociated on AT as well as by heat treatment, can be restored by applying BT. A polymorphism is seen for DI among the as-deposited and the restored J-like structures. The absence of polymorphism for DII indicates a stereospecific role of the 6-CH 3 group in the chromophore aggregation. The lateral photoconductivity Δσ | is controlled in a range of nearly two decades by these treatments and their combinations. The largest Δσ | is attained by a successive application AT → BT.
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