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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

Title	Photoinduced Charge-Transfer Association of Tetracyanoquinodimethane with Aminobiphenyls
Author	Yong Hee Kim, Sang-Don Jung, Myung-Ae Chung, Ki Dong Song, Dae Won Cho*
Keywords	Photoinduced electron transfer, 7,7',8,8'-Tetracyanoquinodimethane (TCNQ), 4-Aminobiphenyl, 2-Aminobiphenyl, Benzidine
Abstract	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 TCNQ^2? 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.
Page	948 - 952
Full Text	PDF

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