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Volumn 101, Issue 49, 1997, Pages 9191-9194

Prediction of singlet-triplet splittings for aryne biradicals from 1H hyperfine interactions in aryl radicals

Author keywords

[No Author keywords available]

Indexed keywords

COMPUTATIONAL METHODS; ELECTRON ENERGY LEVELS; HYDROCARBONS;

EID: 0031553263     PISSN: 10895639     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp973119b     Document Type: Article
Times cited : (42)

References (52)
  • 4
    • 0042089195 scopus 로고
    • Jones, M., Moss, R., Eds.; Wiley: New York
    • Levin, R. H. In Reactive Intermediates; Jones, M., Moss, R., Eds.; Wiley: New York, 1985; Vol. 3; p 1.
    • (1985) Reactive Intermediates , vol.3 , pp. 1
    • Levin, R.H.1
  • 37
    • 33746614482 scopus 로고
    • All calculations employed the cc-pVDZ basis set (Dunning, T. H. J. Cliem. Phys. 1989, 90, 1007). CASPT2 benzyne and naphthalyne calculations employed, respectively, 8-electron/8-orbital and 12-electron/ 12-orbital complete active space (CAS) wave functions as reference, at which levels geometries were optimized for all isomers and spin states. The active spaces were comprised of all π orbitals and the two nonbonding σ orbitals. BPW91 geometries for all isomers and spin states were verified as local minima by computation of analytic vibrational frequencies, which were also used to calculate zero-point vibrational energies.
    • (1989) J. Cliem. Phys. , vol.90 , pp. 1007
    • Dunning, T.H.1
  • 42
    • 5544296960 scopus 로고    scopus 로고
    • note
    • H.
  • 43
    • 5544286393 scopus 로고    scopus 로고
    • note
    • The Hartree-Fock (HF) level might also be indicated for single-reference calculations; however, since it fails to account for electron correlation, this level rarely provides accurate hfs predictions (see ref 41). Moreover, HF wave functions for aryl radicals can suffer from high degrees of spin contamination, making them poor reference configurations for post-HF methods that do account for correlation. These considerations make DFT the preferred method for the systems considered here.
  • 50
    • 5544235620 scopus 로고    scopus 로고
    • note
    • One might also, of course, develop the correlation for measured hfs values. However, in complicated aryl radicals one would expect measurement and assignment of the many coupling constants to be quite challenging, a complication that does not afflict the computational approach.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.