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Photoinduced Charge-Transfer Association of Tetracyanoquinodimethane with Aminobiphenyls
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- Authors
- Yong Hee Kim, Sang-Don Jung, Myung-Ae Chung, Ki Dong Song, Dae Won Cho
- Issue Date
- 2008-05
- Citation
- Bulletin of the Korean Chemical Society, v.29, no.5, pp.948-952
- ISSN
- 0253-2964
- Publisher
- 대한화학회 (KCS)
- Language
- English
- Type
- Journal Article
- 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 photo-irradiation, 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.