Intracomplex electron transfer upon direct excitation of a ground-state complex of benzophenone with 2,5-dimethyl-2,4-hexadiene
✍ Scribed by Toshihiro Nakayama; Teiji Takahashi; Kazuyasu Ibuki; Kumao Hamanoue
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 457 KB
- Volume
- 215
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Benzophenone (BP) forms a ground-state complex with 2,5&methyl-2,4-hexadene (DMHD) and picosecond excitation of this complex pves nse to the appearance of a new absorption band (band C with 1,= 565 nm) Irrespective of DMHD concentration, band C grows Hrlthm the duration of the excitation light pulse and decreases followmg a smgle-exponentlal function urlth a lifetime of 10 ps Hence, band C is assigned to the absorption of an excited smglet charge-transfer complex ( 1 (BP"--DMHDd' )*) or a singlet ion pair ( ' (BP--DMHD+ ) ), which decay process may be mtracomplex back electron transfer (or charge recombmatlon) yleldmg the ground-state BP-DMHD complex and/or free BP plus DMHD