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Volumn 109, Issue 45, 2005, Pages 10348-10356

Quantum chemical characterization of the structures, thermochemical properties, and singlet-triplet splittings of didehydroquinolinium and didehydroisoquinolinium ions

Author keywords

[No Author keywords available]

Indexed keywords

DEGREE OF INTERACTION; ENERGETIC PROPERTIES;

EID: 28244450969     PISSN: 10895639     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp053774g     Document Type: Article
Times cited : (17)

References (55)
  • 17
    • 0032366914 scopus 로고    scopus 로고
    • The experimentally determined gas-phase proton affinities for quinoline and isoquinoline are 227.8 and 227.5 kcal/mol, respectively: Hunter, E. P.; Lias, S. G. J. Phys. Chem. Ref. Data 1998, 27, 413.
    • (1998) J. Phys. Chem. Ref. Data , vol.27 , pp. 413
    • Hunter, E.P.1    Lias, S.G.2
  • 18
    • 1542347140 scopus 로고    scopus 로고
    • The conjugate bases of several of these species have also been studied computationally: Cioslowski, J.; Szarecka, A.; Moncrieff, D. Mol. Phys. 2003, 101, 1221.
    • (2003) Mol. Phys. , vol.101 , pp. 1221
    • Cioslowski, J.1    Szarecka, A.2    Moncrieff, D.3
  • 20
    • 28244444322 scopus 로고    scopus 로고
    • note
    • The choice of the cc-pVDZ basis set was made in part to facilitate comparison to prior related studies where it was demonstrated to be efficient and accurate for the prediction of thermochemical quantities such as those studied here.
  • 25
    • 28244476713 scopus 로고    scopus 로고
    • note
    • Several of the structures for the m-DD(I)Qs were found to be tricyclic using DFT methods. However, the frequencies for these molecules were still used to derive the ZPVEs and 298-K thermal contributions for the structures obtained using both DFT and MCSCF methods. There are clearly ambiguities associated with using a single level of theory to compute ZPVEs when different levels of theory provide qualitatively different structures. However, to the extent that the frequency changes that take place as a function of these different structures are expected to be associated primarily with very low frequencies (since the modes connecting the disparate structures are very soft), the energetic consequences might be expected to be small. In such an instance, using a single set of enthalpy contributions, which is functionally no different than simply comparing relative electronic energies, would appear to be reasonably well justified.
  • 41
    • 0000106622 scopus 로고    scopus 로고
    • Laird, B. B., Ross, R. B., Ziegler, T., Eds.; ACS Symp. Ser. No. 629; American Chemical Society: Washington, DC
    • Lim, M. H.; Worthington, S. E.; Dulles, F. J.; Cramer, C. J. In Density-Functional Methods in Chemistry; Laird, B. B., Ross, R. B., Ziegler, T., Eds.; ACS Symp. Ser. No. 629; American Chemical Society: Washington, DC, 1996; p 402.
    • (1996) Density-functional Methods in Chemistry , pp. 402
    • Lim, M.H.1    Worthington, S.E.2    Dulles, F.J.3    Cramer, C.J.4
  • 45
    • 28244454927 scopus 로고    scopus 로고
    • note
    • We use ortho, meta, and para to refer to isomers in which the two dehydrocarbon atoms have a 1,2-, 1,3-, and 1,4-relationship, respectively, in the same ring.
  • 49
    • 28244498490 scopus 로고    scopus 로고
    • note
    • Elongation of the a bonds would suggest a greater distance between the two dehydrocarbon atoms; however, the bond angles about the dehydrocarbon atoms also increase, which results in nearly identical dehydrocarbon atom separations in 1,4-DD1Q and 2,5-DDP.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.