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Volumn 126, Issue 38, 2004, Pages 12112-12120

Theoretical study on the photochromic cycloreversion reactions of dithienylethenes; on the role of the conical intersections

Author keywords

[No Author keywords available]

Indexed keywords

CHEMICAL REACTIONS; MOLECULAR VIBRATIONS; PHOTOCHROMISM;

EID: 4644250742     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja035035o     Document Type: Article
Times cited : (116)

References (47)
  • 3
  • 29
    • 0001053289 scopus 로고    scopus 로고
    • Calculations of excited-state conformational properties
    • Waluk, J., Ed.; Wiley-VCH: New York
    • O structures show only small geometry changes for both R(C-C) and φ; in this region, there occur bond alternations from the ground- to excited-state structures. For general instructive references, see: Olivucci, M.; Robb, M. A.; Bernardi, F. Calculations of Excited-state Conformational Properties. In Conformational Analysis of Molecules in Excited States; Waluk, J., Ed.; Wiley-VCH: New York, 2000; p 297.
    • (2000) Conformational Analysis of Molecules in Excited States , pp. 297
    • Olivucci, M.1    Robb, M.A.2    Bernardi, F.3
  • 37
    • 4644372102 scopus 로고    scopus 로고
    • note
    • 2). That from 1B/2A CI (C) to 2A/1A CI (O), if it occurs, consists of the R(C-C) changes.
  • 41
    • 4644323536 scopus 로고    scopus 로고
    • note
    • According to the correlation diagram obtained previously (ref 21), the QY of the current compound is expected to be relatively small (∼0.01) because the energy difference is 8.3 kcal/mol (1 kcal/mol = 0.043364 eV).
  • 42
    • 0000636141 scopus 로고    scopus 로고
    • and references therein
    • For the correct evaluation of the 1B relative to 2A state, the CASSCF level is believed not to be sufficient, as reported in many studies of polyenes. For example: Nakayama, H.; Hirao, K. Int. J. Quantum Chem. 1998, 66, 157 and references therein.
    • (1998) Int. J. Quantum Chem. , vol.66 , pp. 157
    • Nakayama, H.1    Hirao, K.2
  • 43
    • 4644300416 scopus 로고    scopus 로고
    • note
    • c minimum, while at the CASPT2 level there is no such interchange and the character of 1B is kept as HOMO → LUMO excitation along R(C-C).
  • 47
    • 4644286514 scopus 로고    scopus 로고
    • note
    • If the feature of the PES, no TS on the 2A surface, at the preliminary nonoptimized CASPT2 level is correct, the reason for the small QYs of the cycloreversion relative to the cyclization reaction, and the temperature dependency of the former reaction, might be attributed to other unknown mechanisms such as the difference of microscopic density of state between the 2A/1A CI (C) and 2A/1A CI (O), or the existence of some vibrational promoting modes on the 2A surface. Such detailed studies are important future subjects for experiments and theory.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.