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Influence of the Ionization Potential and of the Interfacial Electric Field on Photoinduced Hole Transfer Processes in Langmuir‐Blodgett Films
Author(s) -
Itaya Akira,
van der Auweraer Mark,
Verschuere Bart,
De Schryver Frans C.
Publication year - 1991
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.199100018
Subject(s) - chemistry , electric field , langmuir–blodgett film , ionization , chemical physics , langmuir , photochemistry , field (mathematics) , organic chemistry , ion , molecule , aqueous solution , quantum mechanics , mathematics , pure mathematics , physics
The presence of a monolayer of ω‐(2‐anthryl)‐alkanoic acid on an anthracene or perylene single crystal modifies the kinetics of photosensitized hole injection. An increase in the chain length of the ω‐(2‐anthryl)‐alkanoic acid leads to a decrease in the quantum yield of the sensitized hole current (SHC). This effect becomes more important when the ionization potential of the dye is decreased. This argument supports the hypothesis that electron transfer is assisted by an interaction between the HOMO of the dye and that of the alkyl chain. The permanent electric field existing at the interface between the monolayer of ω‐(2‐anthryl)‐alkanoic acid and the monolayer containing the dye is also expected to influence the free energy gain associated with this electron transfer process. When the dye is diluted by tripalmitine instead of arachidic acid, the change in the electrical potential difference at the interface with the monolayer of ω‐(2‐anthryl)‐alkanoic acid leads to a tenfold decrease in the quantum yield of the SHC.