ISSN:
1573-1111
Keywords:
Calix[4]arene
;
crystal structure
;
clay mineral
;
alkali metal ion
;
layered structure
;
water soluble
;
sulfonate
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The title calixarenes all exist in the solid state as bilayers of anionic calixarenes in the cone configuration. These layers alternate with inorganic regions which contain the cations and the water molecules. The overall structures bear a close resemblance to those found for clay minerals. The sodium salt crystallizes in the triclinic space groupPĪ witha = 10.998(6),b = 13.582(5),c = 14.472(5) Å,α = 74.01(3),β = 89.09(4),γ = 86.50(4)°, andZ = 2 forD calc = 1.72 g cm−3. Refinement based on 4727 observed reflections led to a conventionalR = 0.050. The potassium salt crystallizes in the triclinic space groupPĪ witha = 11.815(9),b = 13.636(6),c = 14.040(9) Å,α = 100.24(5),β = 111.86(9),γ = 95,14(9)°, andZ = 2 forD calc = 1.77 g cm−3. Refinement based on 2977 observed reflections led toR = 0.15. The rubidium and cesium salts are isostructural and crystallize in the monoclinic space groupP21/n with parameters for Rb[Cs]a = 11.603(5) [11.704(3)],b = 28.607(8) [29.747(9)],c = 12.512(5) [12.604(4)] Å,β = 91.70(4) [91.63(2)°], andZ = 4 forD calc = 2.01 [2.24] g cm−3. Refinement based on 1750 [4257] observed reflections led toR = 0.108 [0.075]. Disorder of the cations was observed for the rubidium and cesium salts.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01060722
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