Complex formation between crown ethers and urea and some guanidinium derivatives in methanol

Authors
Buschmann, HJ Dong, H Mutihac, L Schollmeyer, E
Citation
Hj. Buschmann et al., Complex formation between crown ethers and urea and some guanidinium derivatives in methanol, J THERM ANA, 57(2), 1999, pp. 487-491
Citations number
18
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
ISSN journal
13886150 → ACNP
Volume
57
Issue
2
Year of publication
1999
Pages
487 - 491
Database
ISI
SICI code
1388-6150(1999)57:2<487:CFBCEA>2.0.ZU;2-D
Abstract
The complexation of urea and some guanidinium derivatives by the ligands 15 -crown-5, 18-crown-6, benzo-18-crown-6 and diaza-18-crown-6 in methanol has been studied by means of calorimetric titrations. The complex formation is mainly favored by entropic contributions. The number of solvent molecules released during the complex formation is responsible for the stability of t he complexes formed.