Synthesis, X-ray crystal structure and cation binding properties of a tetrahomodioxacalix[4]arene tetraester

Autor: Desmond Cunningham, Patrick McArdle, Khadija Ziat, Marie-José Schwing-Weill, Maureen McManus, Françoise Arnaud-Neu, Stephen J. Harris, Suzanne Cremin, M. Anthony McKervey
Rok vydání: 1991
Předmět:
Zdroj: Journal of Inclusion Phenomena and Molecular Recognition in Chemistry. 10:329-339
ISSN: 1573-1111
0923-0750
DOI: 10.1007/bf01133318
Popis: Treatment ofp-t-butyltetrahomodioxacalix[4]arene with ethyl bromoacetate yields a tetraester derivative (4) whose crystal and molecular structure have been determined and whose ion binding properties have been assessed by phase transfer and stability constant measurements. Colorless transparent triclinic crystals (obtained from methoxyethanol) C62H84O14,a = 10.347(2),b = 11.583(2),c = 13.448(3) A,α = 72.04(2),β = 86.50(2)°,γ = 81.23(2)°, space group $$P\bar 1$$ ,Z = 1, MoK α radiationλ = 0.70930 A. Refinement was carried out using 2221 reflections withI > 1.5σ(I). The complexation properties resemble those of calix[6]arene hexaester (6), although weaker, with a preference for the larger alkali cations. Ca2+ and Ba2+; though not extracted, are more strongly complexed than alkali cations. Eu3+ is better complexed than Na+.
Databáze: OpenAIRE
Externí odkaz: