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Volumn 1504, Issue , 2012, Pages 399-405

Theoretical consideration of singlet open-shell character of polyperiacenes using Clar's aromatic sextet valence bond model and quantum chemical calculations

Author keywords

Clar's aromatic sextet; Graphene; NICS; Open shell character; Polyperiacene

Indexed keywords


EID: 84873207679     PISSN: 0094243X     EISSN: 15517616     Source Type: Conference Proceeding    
DOI: 10.1063/1.4771733     Document Type: Conference Paper
Times cited : (51)

References (46)
  • 25
    • 84873170881 scopus 로고    scopus 로고
    • note
    • c) The Clar's aromatic sextet is defined as a cyclic array of six π-electrons localized in a single benzene ring. In polycyclic aromatic systems, two sextets should not be adjacent but be separated by formal C-C single bonds.
  • 26
    • 84873179772 scopus 로고
    • Academic Press, New York
    • E. Clar, Polycyclic Hydrocarbon (Vol. 1); Academic Press, New York, 1964, pp. 288-307.
    • (1964) Polycyclic Hydrocarbon , vol.1 , pp. 288-307
    • Clar, E.1
  • 27
    • 84873186555 scopus 로고    scopus 로고
    • note
    • Resonance effect results in delocalization of unpaired electron on the meso-position to neighbor rings. However, contribution of the formula b-d to the ground state of 3-3 would be smaller than the formula a, since the delocalization of unpaired electron from the meso-position accompanies destruction of one sextet. This consideration is supported by a spin density calculation which gives the largest density on the meso-position (see Figure 6).
  • 30
    • 0037130668 scopus 로고    scopus 로고
    • The theoretical study on effective exchange interaction in phenalenyl radical dimer revealed that the symmetry broken UBHandHLYP calculation best reproduced the experimental value of the magnetic interaction, among unrestricted HF (UHF), pure DFT (UBLYP), hybrid DFT (UBHandHLYP and UB3LYP), and post HF (CASSCF) calculations. See
    • The theoretical study on effective exchange interaction in phenalenyl radical dimer revealed that the symmetry broken UBHandHLYP calculation best reproduced the experimental value of the magnetic interaction, among unrestricted HF (UHF), pure DFT (UBLYP), hybrid DFT (UBHandHLYP and UB3LYP), and post HF (CASSCF) calculations. See, Y. Takano, T. Taniguchi, H. Isobe, T. Kubo, Y. Morita, K. Yamamoto, K. Nakasuji, T. Takui, K. Yamaguchi, J. Am. Chem. Soc. 2002, 124, 11122-11130.
    • (2002) J. Am. Chem. Soc. , vol.124 , pp. 11122-11130
    • Takano, Y.1    Taniguchi, T.2    Isobe, H.3    Kubo, T.4    Morita, Y.5    Yamamoto, K.6    Nakasuji, K.7    Takui, T.8    Yamaguchi, K.9
  • 41
    • 21844460398 scopus 로고
    • The π-bonding energy is estimated from the rotational barrier in ethylene. See
    • The π-bonding energy is estimated from the rotational barrier in ethylene. See, B. S. Rabinovitch, F. S. Looney, J. Chem. Phys. 1955, 23, 315-323.
    • (1955) J. Chem. Phys. , vol.23 , pp. 315-323
    • Rabinovitch, B.S.1    Looney, F.S.2
  • 46
    • 0141789719 scopus 로고    scopus 로고
    • The ring A also has a large negative NICS value. This can be explained by the sextet migration from the ring B to the ring A. See the reference 6a, and
    • The ring A also has a large negative NICS value. This can be explained by the sextet migration from the ring B to the ring A. See the reference 6a, and M. Randić, Chem. Rev. 2003, 103, 3449-3606.
    • (2003) Chem. Rev. , vol.103 , pp. 3449-3606
    • Randić, M.1


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.