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Volumn , Issue 12, 2000, Pages 1021-1022

Singlet-triplet energy gap in a cyclophane-based organic diradical with parallel exchange coupling pathways

Author keywords

[No Author keywords available]

Indexed keywords

CYCLOPHANE; RADICAL;

EID: 0034697788     PISSN: 13597345     EISSN: None     Source Type: Journal    
DOI: 10.1039/b001273o     Document Type: Article
Times cited : (13)

References (30)
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  • 4
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    • D. A. Dougherty, Acc. Chem. Res., 1991, 24, 88; W. T. Borden, H. Iwamura and J. A. Berson, Acc. Chem. Res., 1994, 27, 109; J. S. Miller and A. Epstein, Angew. Chem., Int. Ed. Engl., 1994, 33, 385; J. A. Berson, Acc. Chem. Res., 1997, 30, 238; H. Iwamura, K. Inoue and N. Koga, New J. Chem., 1998, 201; Magnetic Properties of Organic Materials, ed. P. M. Lahti, Marcel Dekker, New York, 1999.
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    • D. A. Dougherty, Acc. Chem. Res., 1991, 24, 88; W. T. Borden, H. Iwamura and J. A. Berson, Acc. Chem. Res., 1994, 27, 109; J. S. Miller and A. Epstein, Angew. Chem., Int. Ed. Engl., 1994, 33, 385; J. A. Berson, Acc. Chem. Res., 1997, 30, 238; H. Iwamura, K. Inoue and N. Koga, New J. Chem., 1998, 201; Magnetic Properties of Organic Materials, ed. P. M. Lahti, Marcel Dekker, New York, 1999.
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    • Marcel Dekker, New York
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    • For the effect of multiple pathways in electron transfer, see: J. N. Onuchcic, P. C. P. Andrade and D. N. Beratan, J. Chem. Phys., 1991, 95, 1131; D. N. Beratan, J. N. Onuchcic, J. R. Winkler and H. B. Gray, Science, 1992, 258, 1740.
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  • 13
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    • For the effect of multiple pathways in electron transfer, see: J. N. Onuchcic, P. C. P. Andrade and D. N. Beratan, J. Chem. Phys., 1991, 95, 1131; D. N. Beratan, J. N. Onuchcic, J. R. Winkler and H. B. Gray, Science, 1992, 258, 1740.
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  • 14
    • 0343129652 scopus 로고    scopus 로고
    • note
    • For different problems of multiple exchange coupling pathways, including spin coupling units and spin coupling paths, see: refs 1-3.
  • 23
    • 0030504688 scopus 로고    scopus 로고
    • and references therein
    • For analogous macrocycles, with 6,6′-connected 2,2′-bipyridines, see: S. Ogawa and S. Tsuchiya, Chem. Lett., 1996, 709 and references therein.
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    • Ogawa, S.1    Tsuchiya, S.2
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    • 0344001818 scopus 로고    scopus 로고
    • note
    • 1H NMR, and IR analyses.
  • 26
    • 0343565557 scopus 로고    scopus 로고
    • note
    • s = 1 region, 2\D/hc\, is a function of an 'average distance between the unpaired electrons' in the through-space magnetic dipolar model for zfs: e.g. ref. 18.
  • 27
    • 0031439624 scopus 로고    scopus 로고
    • For the sample preparation techniques, see: A. Rajca, J. Wongsriratanakul and S. Rajca, J. Am. Chem. Soc., 1997, 119, 11674. Because only a small portion, with unknown weight of 1, is measured, the spin concentration can not be estimated. Following the magnetization studies, the samples are kept at room temperature for 12+ months; the broad maximum in M vs. T is not detectable and paramagnetic susceptibility at 2 K (primarily from S = 1/2 impurities) is of the order of 10% or less of the original value. Subsequently, the identical sequence of measurements was repeated for the point-by-point background correction.
    • (1997) J. Am. Chem. Soc. , vol.119 , pp. 11674
    • Rajca, A.1    Wongsriratanakul, J.2    Rajca, S.3
  • 30
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    • Gaussian, Inc., Pittsburgh, PA
    • -1, respectively. Values of S(S + 1) are 2.05-2.06 and 1.04-1.05 for the triplets and the broken symmetry singlets, respectively. Also, the total spin densities at the sites i and j are -0.073 (for 1) and -0.049 (for 2). Gaussian 98, Gaussian, Inc., Pittsburgh, PA, 1998.
    • (1998) Gaussian 98


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