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Volumn 113, Issue 5, 2009, Pages 895-901

Calculations of the relative energies of the low-lying electronic states of 2-methylenedihydrophenalene-1,3-diyl: Effects of a 1,8-naphtho bridging group on trimethylenemethane and of a vinylidene bridging group on 1,8-naphthoquinodimethane

Author keywords

[No Author keywords available]

Indexed keywords

BRIDGING GROUPS; CAS-SCF; COMPUTATIONAL RESULTS; DIRADICAL; DIRADICALS; ENERGY DIFFERENCES; FERROMAGNETIC COUPLINGS; LOW-LYING ELECTRONIC STATE; RELATIVE ENERGIES; TRIMETHYLENEMETHANE;

EID: 61749094390     PISSN: 10895639     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp809715v     Document Type: Article
Times cited : (6)

References (42)
  • 3
    • 0003304594 scopus 로고
    • Experimental work on TMM has been reviewed by:, Borden, W. T, Ed, Wiley-Interscience: New York
    • (b) Experimental work on TMM has been reviewed by: Berson, J. A. In Diradicals; Borden, W. T., Ed.; Wiley-Interscience: New York, 1982; pp 151-194.
    • (1982) Diradicals , pp. 151-194
    • Berson, J.A.1
  • 5
    • 0011429703 scopus 로고    scopus 로고
    • A diaza derivative of 4 has also been generated: Platz, M. S.; Carrol, G.; Pierrat, F.; Zayas, J.; Auster, S. Tetrahedron 1982, 38, 777.
    • (b) A diaza derivative of 4 has also been generated: Platz, M. S.; Carrol, G.; Pierrat, F.; Zayas, J.; Auster, S. Tetrahedron 1982, 38, 777.
  • 8
    • 0003691438 scopus 로고
    • Reviews: a, Borden, W. T, Ed, Wiley-Interscience: New York
    • Reviews: (a) Borden, W. T. In Diradicals; Borden, W. T., Ed.; Wiley-Interscience: New York, 1982; pp 1-72.
    • (1982) Diradicals , pp. 1-72
    • Borden, W.T.1
  • 9
    • 0000624609 scopus 로고    scopus 로고
    • Allinger, N. L, Clark, T, Gasteiger, J, Kollman, P. A, Schaefer, H. F, III, Schreiner, P. R, Eds, Wiley: Chichester, UK
    • (b) Borden, W. T. In Encyclopedia of Computational Chemistry; Schleyer, P. v. R., Allinger, N. L., Clark, T., Gasteiger, J., Kollman, P. A., Schaefer, H. F., III, Schreiner, P. R., Eds.; Wiley: Chichester, UK, 1998; pp 708-722.
    • (1998) Encyclopedia of Computational Chemistry; Schleyer, P , vol.R , pp. 708-722
    • Borden, W.T.1
  • 23
    • 61749095376 scopus 로고    scopus 로고
    • Hrovat, D. A.; Borden, W. T., results tabulated by: Bally, T.; Borden, W. T. In Reviews in Computational Chemistry; Lipkowitz, K. B., Boyd, D. B., Eds.; VCH: New York, 1998; 1-99.
    • (j) Hrovat, D. A.; Borden, W. T., results tabulated by: Bally, T.; Borden, W. T. In Reviews in Computational Chemistry; Lipkowitz, K. B., Boyd, D. B., Eds.; VCH: New York, 1998; 1-99.
  • 24
    • 33751323829 scopus 로고    scopus 로고
    • The CASPT2 results for 3 in Table 3 of the Review in ref 11j differ slightly from those in Table 1 of this paper, because the former were obtained with IPEA shift = 0.0 in MOLCAS, whereas the latter were obtained with IPEA shift = 0.25. (1) Brabec, J.; Pittner, J. J. Phys. Chem. A 2006, 110, 11765.
    • (k) The CASPT2 results for 3 in Table 3 of the Review in ref 11j differ slightly from those in Table 1 of this paper, because the former were obtained with IPEA shift = 0.0 in MOLCAS, whereas the latter were obtained with IPEA shift = 0.25. (1) Brabec, J.; Pittner, J. J. Phys. Chem. A 2006, 110, 11765.
  • 26
    • 84868900223 scopus 로고    scopus 로고
    • 12
    • 12
  • 27
    • 2442676580 scopus 로고    scopus 로고
    • 2 states of 4 have been published: Datta, S. N.; Jha, P. P.; Ali, Md. E. J. Phys. Chem. A 2004, 108, 4087. However, a singlet diradical cannot be properly represented by a wave function consisting of a single configuration.
    • 2 states of 4 have been published: Datta, S. N.; Jha, P. P.; Ali, Md. E. J. Phys. Chem. A 2004, 108, 4087. However, a singlet diradical cannot be properly represented by a wave function consisting of a single configuration.
  • 33
    • 61749092887 scopus 로고    scopus 로고
    • The CASSCF optimized geometries and the CASSCF and CASPT2 energies are available in the Supporting Information for this paper.
    • The CASSCF optimized geometries and the CASSCF and CASPT2 energies are available in the Supporting Information for this paper.
  • 34
    • 61749086279 scopus 로고    scopus 로고
    • MOLCAS, Version 6.4
    • MOLCAS, Version 6.4:
  • 36
    • 61749096047 scopus 로고    scopus 로고
    • Since the NBMOs of the 1B1 states of 2 and 3 are disjoint, 3B1 is calculated to lie below 1B1 by only a few tenths of a kcal/mol in both diradicals. Consequently, like the energies of the twisted 1B1 states, the energies of the twisted 3B1 states, relative to the planar 3B2 states, are calculated to be nearly the same in 2 and 3. Therefore, the energies required to twist a methylene group out of conjugation are nearly the same in the 3B 2 states of both diradicals. Given the very similar bond lengths between the central carbons and the methylene groups in the planar, 3B2, ground states of 2 and 3, this finding is not at all surprising
    • 2, ground states of 2 and 3, this finding is not at all surprising.
  • 37
    • 84868897317 scopus 로고    scopus 로고
    • 2 NBMO.
    • 2 NBMO.
  • 38
    • 85174988031 scopus 로고    scopus 로고
    • 1 the ground state of 1,3-benzoquinodimethane was proposed by: West, A. P., Jr.; Silverman, S. K.; Dougherty, D. A. J. Am. Chem. Soc. 1996, 118, 1452.
    • 1 the ground state of 1,3-benzoquinodimethane was proposed by: West, A. P., Jr.; Silverman, S. K.; Dougherty, D. A. J. Am. Chem. Soc. 1996, 118, 1452.
  • 41
    • 61749100014 scopus 로고    scopus 로고
    • Our (6/6)CASSCF/6-31G(d) calculations place the 1Ag and 1B2u states of 6 respectively 19.8 and 27.1 kcal/mol above the 3B2u ground state
    • 2u ground state.
  • 42
    • 61749097317 scopus 로고    scopus 로고
    • Inclusion of dynamic electron correlation by CASPT2 reduces the CASSCF energy differences to 18.0 and 18.6 kcal/mol.
    • (c) Inclusion of dynamic electron correlation by CASPT2 reduces the CASSCF energy differences to 18.0 and 18.6 kcal/mol.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.