An ESR study of pressure effects on the inclusion-complex formation of cyclodextrins with Di-tert-butyl nitroxide

Yoshimi Sueishi, Norio Nishimura, Koichi Hirata, Keiji Kuwata

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The volume change upon the inclusion-complex formation of cyclodextrins (β,γ-CD's) with di-tert-butyl nitroxide (DTBN) has been studied by a high-pressure ESR technique. Anisotropic motion of DTBN in γ-CD suggested a loose inclusion of DTBN in the γ-CD cavity. The equilibrium constants (K's) for the inclusion-complex formation of CD's with DTBN decreased with increasing external pressure. From the pressure dependence of K, the reaction volumes were estimated to be 5 ± 1 cm3 mol-1 for the DTBN/β-CD system and 20 ± 2 cm3 mol-1 for the DTBN/γ-CD system, respectively. The difference has been ascribed to the difference in the number of water molecules excluded from the CD cavity upon inclusion.

Original languageEnglish
Pages (from-to)5359-5361
Number of pages3
JournalJournal of Physical Chemistry
Volume95
Issue number13
DOIs
Publication statusPublished - Jan 1 1991

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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