ISSN:
1573-1111
Keywords:
Calixarenes
;
X-ray structure
;
stability constants
;
complexation
;
phase transfer
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract 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) Å,α = 72.04(2),β = 86.50(2)°,γ = 81.23(2)°, space group $$P\bar 1$$ ,Z = 1, MoK α radiationλ = 0.70930 Å. 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+.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01133318
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