| Effect of pressure on [2]pseudorotaxane formation and decomplexation and their corresponding activation volumes. | |
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MedLine Citation:
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PMID: 20593805 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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In this study, we investigated the effect of pressure on the formation and decomplexation of [2]pseudorotaxanes. High pressure accelerated the formation of [2]pseudorotaxanes in an aprotic nonpolar solvent (CDCl(3)/CD(3)CN) via the slipping approach when using two crown ether/secondary ammonium salt systems: dibenzo[24]crown-8/bis(cyclohexylmethyl)ammonium salt (1a/2a) and tetrabenzo[24]crown-8/dibenzylammonium salt (1b/2b). The influence of pressure on the rate constants for the formation of the [2]pseudorotaxanes 3a and 3b revealed activation volumes (DeltaV(double dagger)) of -2.5 and -4.6 cm(3) mol(-1), respectively, at 303 K and zero pressure. We also investigated the effect of pressure on the decomplexation of the [2]pseudorotaxanes 3a and 3b in a polar solvent (DMSO-d(6)/CDCl(3)), obtaining activation volumes of -0.9 and -0.4 cm(3) mol(-1), respectively, at 303 K and zero pressure. Moreover, we calculated the activation parameters for the decomplexation processes on the basis of transition state theory at each pressure. |
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Authors:
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Yuji Tokunaga; Nanae Wakamatsu; Norihiro Ohiwa; Osamu Kimizuka; Akihiro Ohbayashi; Koichiro Akasaka; Susumu Saeki; Kenji Hisada; Tatsuhiro Goda; Youji Shimomura |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of organic chemistry Volume: 75 ISSN: 1520-6904 ISO Abbreviation: J. Org. Chem. Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-07-30 Completed Date: 2010-11-30 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 2985193R Medline TA: J Org Chem Country: United States |
Other Details:
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Languages: eng Pagination: 4950-6 Citation Subset: - |
Affiliation:
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Department of Materials Science and Engineering, Faculty of Engineering, University of Fukui, Fukui, 910-8507, Japan. tokunaga@matse.u-fukui.ac.jp |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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