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Volumn 120, Issue 7, 1998, Pages 1456-1465

Spectroscopic comparisons of MoW(porphyrin)2 heterodimers with homologous Mo2 and W2 quadruple bonds: A dynamic NMR and resonance raman study

Author keywords

[No Author keywords available]

Indexed keywords

DIMER; MACROCYCLIC COMPOUND; MOLYBDENUM; PORPHYRIN; TUNGSTEN;

EID: 0032564927     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja972130m     Document Type: Article
Times cited : (15)

References (54)
  • 6
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    • Ph.D. Thesis, Iowa State University
    • Carlin, R. T. Ph.D. Thesis, Iowa State University, 1982.
    • (1982)
    • Carlin, R.T.1
  • 12
    • 84889197321 scopus 로고
    • Ph.D. Thesis, Stanford University
    • 2OEP derivatives. See: Godwin, H. A. Ph.D. Thesis, Stanford University, 1994.
    • (1994)
    • Godwin, H.A.1
  • 23
    • 84889234363 scopus 로고    scopus 로고
    • note
    • 3], where r is the distance of the test nucleus to the source of anisotropy and θ is the angle between the r vector and the source axis.
  • 24
    • 0000317847 scopus 로고
    • A significant shielding of the methylene protons in the ethyl groups adjacent to the tolyl substituent is observed (δ 3.00 and 2.83 vs 4.6-3.8 ppm for 2, Table 1), analogous to shifts in [10]paracyclophane: Agarwal, A.; Barnes, J. A.; Fletcher, J. L.; McGlinchey, M. J.; Sayer, B. G. Can. J. Chem. 1977, 55, 2575.
    • (1977) Can. J. Chem. , vol.55 , pp. 2575
    • Agarwal, A.1    Barnes, J.A.2    Fletcher, J.L.3    McGlinchey, M.J.4    Sayer, B.G.5
  • 26
    • 84889172830 scopus 로고    scopus 로고
    • note
    • The complete NOESY/EXCHSY spectrum is available as Supporting Information.
  • 27
    • 84889187940 scopus 로고    scopus 로고
    • note
    • cis protons.
  • 28
    • 0004237369 scopus 로고
    • Academic Press: New York
    • meso-Proton deshielding due to the ring current of an aryl substituent as a function of the angle of rotation about the metal-metal bond was calculated with the Waugh-Fessenden classical model of ring current magnetic anisotropy as developed by Johnson-Bovey: Bovey, F. A. Nuclear Magnetic Resonance; Academic Press: New York, 1988; p 108.
    • (1988) Nuclear Magnetic Resonance , pp. 108
    • Bovey, F.A.1
  • 30
    • 84889217309 scopus 로고    scopus 로고
    • note
    • 2, were obtained at each temperature from the line widths in [(OEP)-MoW(OEP)], which undergoes the same dynamic exchange but between sites which are magnetically equivalent.
  • 31
    • 0004065524 scopus 로고
    • Academic Press: New York
    • B the Boltzmann constant, and h Planck's constant. See: Sandstrom, J. Dynamic NMR Spectroscopy; Academic Press: New York, 1982.
    • (1982) Dynamic NMR Spectroscopy
    • Sandstrom, J.1
  • 34
    • 84889174031 scopus 로고    scopus 로고
    • note
    • MM in the dimers were absent from the monomer spectra.
  • 35
    • 84889189166 scopus 로고    scopus 로고
    • note
    • -1).
  • 37
    • 84889231190 scopus 로고    scopus 로고
    • note
    • 2, probably due to its very poor solubility, so a third comparison is not available.
  • 50
    • 84889186966 scopus 로고    scopus 로고
    • note
    • The steric component of the barrier must be less than the difference in measured barriers of OEP-X derivatives. These barriers are conveniently tabulated in ref 41.
  • 53
    • 84889220082 scopus 로고    scopus 로고
    • note
    • Estimates indicate that the δ-bond contributes only about 10% of the overall bond strength; therefore, trends in the quadruple bond force constants will be primarily indicative of changes in the σ and π-bond strengths.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.