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Volumn 112, Issue 37, 2008, Pages 8706-8714

The binding behavior of cyclodextrins toward a nitroxide spin probe in the presence of different alcohols as studied by EPR

Author keywords

[No Author keywords available]

Indexed keywords

CYCLODEXTRINS;

EID: 53149136648     PISSN: 10895639     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp8051642     Document Type: Article
Times cited : (14)

References (55)
  • 41
    • 53149112553 scopus 로고    scopus 로고
    • The enantioselectivity of β-CD toward an enantiomeric couple can be quantitatively estimated through the expression: enantioselectivity, ES, K2S, K2(R, × 100/(K2(S, K2R
    • 2(R)).
  • 43
    • 8644243613 scopus 로고    scopus 로고
    • 0 for alcohols 9-11 and 14 were calculated by means of ChemDraw 4.5 software. All of the other values have been taken from the literature: Leo, A.; Hausch, C.; Elkins, D. Chem. Rev. 1971, 71, 525.
    • 0 for alcohols 9-11 and 14 were calculated by means of ChemDraw 4.5 software. All of the other values have been taken from the literature: Leo, A.; Hausch, C.; Elkins, D. Chem. Rev. 1971, 71, 525.
  • 44
    • 53149146524 scopus 로고    scopus 로고
    • This result is in agreement with that reported by Matsui and Mochida,37 who correlated log Ka (association constant of the complex alcohol:β-CD) with the log P0 value of a series of 1-alcanols: log Ka, 0.94 log P0, 0.58, n, 8, r2, 0.998
    • 2 = 0.998.
  • 55
    • 53149143741 scopus 로고    scopus 로고
    • diss‡ are related to the change in randomness on passing from reactants or complex, respectively, to the transition state. In general, the following four terms should contribute to the activation entropy: (a) the freezing of motional degrees of freedom for the guest molecule, (b) the desolvation around the guest molecule and the reorganization of solvent water, (c) the release of water molecules from the CD cavity, and (d) any conformational changes of the CD torus. While the first term will be negative, the other ones are expected to contribute positively to the activation entropy. In the presence of alcohol, the picture is even more complicated, because the inclusion and the release of alcohol molecules by CD can significantly modify this picture.
    • diss‡ are related to the change in randomness on passing from reactants or complex, respectively, to the transition state. In general, the following four terms should contribute to the activation entropy: (a) the freezing of motional degrees of freedom for the guest molecule, (b) the desolvation around the guest molecule and the reorganization of solvent water, (c) the release of water molecules from the CD cavity, and (d) any conformational changes of the CD torus. While the first term will be negative, the other ones are expected to contribute positively to the activation entropy. In the presence of alcohol, the picture is even more complicated, because the inclusion and the release of alcohol molecules by CD can significantly modify this picture. For this reason, we preferred to omit any detailed discussion on the activation entropies.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.