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Volumn 119, Issue 5, 1997, Pages 1059-1071

Theoretical investigations on the structure of poly(iminomethylenes) with alipathic side chains. Conformational studies and comparison with experimental spectroscopic data

Author keywords

[No Author keywords available]

Indexed keywords

POLYETHYLENE DERIVATIVE; POLYMER;

EID: 0031019184     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja961692n     Document Type: Article
Times cited : (49)

References (74)
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    • note
    • Strictly speaking, the terms isotactic and syndiotactic could not be employed in this case, as they refer to the stereochemistry of (pseudo)-asymmetric carbon atoms. We use them as labels to facilitate comprehension of the physical situation.
  • 48
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    • note
    • Program based on a least-square algorithm, written by Pelliccioni, A. (CNR, Rome, Italy).
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    • CNDO/S, Del Bene, J.; Jaffé, H. H. J. Chem. Phys. 1968, 48, 1807. Ibid. 1968, 49, 1221. Ibid. 1969, 50, 1126. Ellis, R. L.; Kuehnlenz, G.; Jaffé, H. H. Theor. Chim. Acta 1972, 26, 131.
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    • CNDO/S, Del Bene, J.; Jaffé, H. H. J. Chem. Phys. 1968, 48, 1807. Ibid. 1968, 49, 1221. Ibid. 1969, 50, 1126. Ellis, R. L.; Kuehnlenz, G.; Jaffé, H. H. Theor. Chim. Acta 1972, 26, 131.
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    • CNDO/S, Del Bene, J.; Jaffé, H. H. J. Chem. Phys. 1968, 48, 1807. Ibid. 1968, 49, 1221. Ibid. 1969, 50, 1126. Ellis, R. L.; Kuehnlenz, G.; Jaffé, H. H. Theor. Chim. Acta 1972, 26, 131.
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    • CNDO/S, Del Bene, J.; Jaffé, H. H. J. Chem. Phys. 1968, 48, 1807. Ibid. 1968, 49, 1221. Ibid. 1969, 50, 1126. Ellis, R. L.; Kuehnlenz, G.; Jaffé, H. H. Theor. Chim. Acta 1972, 26, 131.
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    • The use of configuration interaction in CNDO/S calculations has been subjected to criticisms: see, for instance, Bouman, T. D.; Lightner, D. A. J. Am. Chem. Soc. 1976, 98, 3145. The authors find that inclusion of CI shifts the n-π* transition of ketones at too low energies, exactly what was found by us in our diimine.
    • (1976) J. Am. Chem. Soc. , vol.98 , pp. 3145
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    • note
    • In De Voe calculations only the transitions of the iminic chromophore were taken into account. In dynamic ones the contribution of side chains (C-C and C-H bonds) were considered, too. However, in the present case the optical activity due to side chains is small compared to that of the iminic backbone.
  • 73
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    • note
    • An analogous calculation using the dynamic method would be complicated by (i) the predicted presence of two "n-π*" transitions; (ii) the nonobvious localization of the transitions themselves and of the relative quadrupolar transition charges.


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