Takaya, Tomohisa ; Saha, Satyen ; Hamaguchi, Hiro-o ; Sarkar, Moloy ; Samanta, Anunay ; Iwata, Koichi (2006) Charge resonance character in the charge transfer state of bianthryls: effect of symmetry breaking on time-resolved near-IR absorption spectra The Journal of Physical Chemistry A, 110 (13). pp. 4291-4295. ISSN 1089-5639
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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp060049c
Related URL: http://dx.doi.org/10.1021/jp060049c
Abstract
We study the effects of symmetry breaking on the photogenerated intramolecular charge transfer (CT) state of 9,9'-bianthryl (BA) with femtosecond time-resolved near-IR spectroscopy. The time-resolved near-IR spectra are measured in acetonitrile for a symmetric substituted derivative of 10,10'-dicyano-9,9'-bianthryl (DCBA) and asymmetric substituted derivatives of 10-cyano-9,9'-bianthryl (CBA) and 9-(N-carbazolyl)anthracene (C9A), as well as nonsubstituted BA. The transient near-IR absorption spectrum of each compound at 0 ps has a locally excited (LE) absorption band, which agrees with the transient absorption band of the corresponding monomer unit. At 3 ps after the photoexcitation, the symmetric compounds show a broad charge transfer (CT) absorption band, whereas no absorption peak appears in the spectra of the asymmetric compounds. The broad CT absorption at 1250 nm only observed for the symmetric compounds can be attributed to the charge resonance transition associated with two equivalent charge separated states.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Chemical Society. |
ID Code: | 86709 |
Deposited On: | 12 Mar 2012 16:06 |
Last Modified: | 12 Mar 2012 16:07 |
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