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The conformation and dynamic behaviour of tetrathiacalix[4]arenes functionalized by hydrazide and hydrazone groups
- Source :
- Journal of Molecular Structure. 885:111-121
- Publication Year :
- 2008
- Publisher :
- Elsevier BV, 2008.
-
Abstract
- The 1 H, 13 C and 15 N NMR data, conformation and dynamic behaviour of the new tetrathiacalix[4]arenes functionalized by hydrazide and hydrazone groups are reported and compared with the result of earlier investigations of 4- tert -butylphenoxyacetylhydrazones. The unusual fact of formation of N , N ′-diacetylhydrazine bridge and factors leading to its formation in the cone conformer of calixarene has been discussed. The barriers of rotation of hydrazone fragments of tetrathiacalix[4]arenes were determined by NMR-measurements at various temperatures. The structure of 1,3 - alternate conformer of 5,11,17,23-tetra- tert -butyl-25,26,27,28-tetrakis[hydrazinocarbonylmethyl]-2,8,14,20-tetrathiacalix[4]arene in solution is compared with crystal structure obtained by the X-ray analysis.
- Subjects :
- chemistry.chemical_classification
Stereochemistry
Organic Chemistry
Hydrazone
Crystal structure
Nuclear magnetic resonance spectroscopy
Hydrazide
Medicinal chemistry
Nmr data
Analytical Chemistry
Inorganic Chemistry
chemistry.chemical_compound
chemistry
Calixarene
X-ray crystallography
Conformational isomerism
Spectroscopy
Subjects
Details
- ISSN :
- 00222860
- Volume :
- 885
- Database :
- OpenAIRE
- Journal :
- Journal of Molecular Structure
- Accession number :
- edsair.doi...........fb585fdbbcb143097a276407c3cf2b4c