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{Δ-1,4,7,10-Tetrakis[(S)-2-hydroxypropyl-κO]-1,4,7,10-tetraazacyclododecane-κ4N}cadmium(II) salicylate perchlorate hemihydrate

✍ Scribed by Smith, Christopher B. ;Lincoln, Stephen F. ;Taylor, Max R. ;Wainwright, Kevin P.

Publisher: International Union of Crystallography
Year: 2001
Tongue: English
Weight: 381 KB
Volume: 58
Category: Article
ISSN: 1600-5368
DOI: 10.1107/s1600536801021316

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✦ Synopsis

Crystallization of [Cd(S-thpc12)](ClO 4 ) 2 ÁH 2 O {S-thpc12 is 1,4,7,10-tetrakis[(S)-2-hydroxypropyl]-1,4,7,10-tetraazacyclo-dodecane} in the presence of sodium salicylate (sodium o-hydroxybenzoate) forms a receptor complex, namely the title compound, [Cd(C 20 H 44 N 4 O 4 )(C 7 H 5 O 3 )]ClO 4 Á0.5H 2 O, in which salicylate is hydrogen bonded, via each of its two carboxylate O atoms, to pairs of cis-related pendant hydroxyl groups which, together with the four N atoms, are themselves bound to Cd II in an approximately square anti-prismatic arrangement. The diastereoselectivity of the complex-forming process is apparent from the fact that only molecules having Á helicity, associated with the spiralling of the pendant arms, are formed.

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✦ Synopsis

{Δ-1,4,7,10-Tetrakis[(S)-2-hydroxypropyl-κO]-1,4,7,10-tetraazacyclododecane-κ4N}cadmium(II) salicylate perchlorate hemihydrate