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Complex formation between 1-chloro-4-(trifluoromethyl)benzene (guest) and 4-tert-butylcalix[4]arenes (host) distally substituted with phosphonic acid or phosphonic ester groups at the lower rim
- Source :
-
Tetrahedron . Jun2002, Vol. 58 Issue 25, p5119. 6p. - Publication Year :
- 2002
-
Abstract
- The complexation behavior of the distally substituted phosphonic acid and phosphonic ester 4-tert-butylcalix[4]arenes (hosts) with 1-chloro-4-(trifluoromethyl)benzene (guest) was examined in chloroform. The complex stability constants (Ks) and the thermodynamic parameters of the complexation were determined by a spectrofluorometric method using Job''s method and van''t Hoff theory, respectively. A strong dependence of the host–guest interaction on the extent of distortion in the conformation of calixarene host cavity was obtained. The ‘pinched cone’ conformer of 1,3-substituted calix[4]arenes seems to form a complex with electron-deficient neutral aromatics predominantly through π–π type interaction. [Copyright &y& Elsevier]
- Subjects :
- *CALIXARENES
*COMPLEX compounds
*THERMODYNAMICS
*CONFORMATIONAL analysis
Subjects
Details
- Language :
- English
- ISSN :
- 00404020
- Volume :
- 58
- Issue :
- 25
- Database :
- Academic Search Index
- Journal :
- Tetrahedron
- Publication Type :
- Academic Journal
- Accession number :
- 7827880