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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 5
BKCSDE 29(5)
May 20, 2008 

Photoinduced Charge-Transfer Association of Tetracyanoquinodimethane with Aminobiphenyls
Yong Hee Kim, Sang-Don Jung, Myung-Ae Chung, Ki Dong Song, Dae Won Cho*
Photoinduced electron transfer, 7,7',8,8'-Tetracyanoquinodimethane (TCNQ), 4-Aminobiphenyl, 2-Aminobiphenyl, Benzidine
The molecular association of acceptors with electron donors is studied in the highly-polar solvent CH3CN. Tetracyanoquinodimethane (TCNQ) forms a stable charge-transfer complex with donor molecules such as 4- aminobiphenyl (4-AB), benzidine (BD) and 2-aminobiphenyl (2-AB) with high association constants. The complexes of TCNQ with 4-AB or BD show new absorption bands at around 800 and 500 nm, which can be identified as reduced TCNQ?? and TCNQ2? species, respectively. These bands grow quickly upon photoirradiation, implying that the charge-transfer complexes are easily formed in an excited state. Conversely, a small spectral manifestation of the charge transfer was observed in the case of 2-AB complex. It is demonstrated that the structural orientation between the geminate ion pairs could play an important role in building a stable complex.
948 - 952
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