Paraquat substituent effect on complexation with a dibenzo-24-crown-8-based cryptand.

Paraquat substituent effect on complexation with a dibenzo-24-crown-8-based cryptand. Research Abstract Details 

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Paraquat substituent effect on complexation with a dibenzo-24-crown-8-based cryptand. Abstract Text:

Jinqiang Zhang,Feihe Huang,Ning Li,Hong Wang,Harry W Gibson,Peter Gantzel,Arnold L Rheingold,Jinqiang Zhang,Feihe Huang,Ning Li,Hong Wang,Harry W Gibson,Peter Gantzel,Arnold L Rheingold,

Dibenzo-24-crown-8-based cryptand 4 forms 1:1 inclusion complexes with three paraquat derivatives, P1, P2, and P3, as demonstrated by proton NMR spectroscopy and X-ray analysis. However, it was found that methyl-substituted paraquat derivatives, P2 and P3, can bind cryptand 4 more strongly than non-methyl-substituted paraquat derivative P1. The association constants (Ka) were determined in acetone by using a UV-vis titration method to be 5.0 x 10(3) M(-1) for 4.P1, 1.0 x 10(5) M(-1) for 4.P2, and 1.2 x 10(5) M(-1) for 4.P3, respectively. In the solid state, 4.P2 and 4.P3 have similar T-type inclusion complexation conformations, which are very different from the pseudorotaxane-type complexation conformation of 4.P1. Theoretical calculations were done to explain these experimental results.

Paraquat substituent effect on complexation with a dibenzo-24-crown-8-based cryptand. Publishing Authors By Initials

J Zhang,F Huang,N Li,H Wang,HW Gibson,P Gantzel,AL Rheingold,J Zhang,F Huang,N Li,H Wang,HW Gibson,P Gantzel,AL Rheingold,

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Paraquat substituent effect on complexation with a dibenzo-24-crown-8-based cryptand. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The Journal of organic chemistry

VOLUME: 72

Page Numbers: 8935-8

Journal Abbreviation: J. Org. Chem.

ISSN: 0022-3263

DAY: 13

MONTH: 10

YEAR: 2007

Paraquat substituent effect on complexation with a dibenzo-24-crown-8-based cryptand. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Paraquat substituent effect on complexation with a dibenzo-24-crown-8-based cryptand.

AFFILIATION: Department of Chemistry, Zhejiang University, Hangzhou, PR China.

Country: United States

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MEDLINETA: J Org Chem

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