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Acta Cryst. (2002). E58, m33-m35  [ doi:10.1107/S1600536801021316 ]

{[Delta]-1,4,7,10-Tetrakis[(S)-2-hydroxypropyl-[kappa]O]-1,4,7,10-tetraazacyclododecane-[kappa]4N}cadmium(II) salicylate perchlorate hemihydrate

C. B. Smith, S. F. Lincoln, M. R. Taylor and K. P. Wainwright

Abstract: Crystallization of [Cd(S-thpc12)](ClO4)2·H2O {S-thpc12 is 1,4,7,10-tetrakis[(S)-2-hydroxypropyl]-1,4,7,10-tetraazacyclododecane} in the presence of sodium salicylate (sodium o-hydroxybenzoate) forms a receptor complex, namely the title compound, [Cd(C20H44N4O4)(C7H5O3)]ClO4·0.5H2O, 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 CdII in an approximately square anti-prismatic arrangement. The diastereoselectivity of the complex-forming process is apparent from the fact that only molecules having [Delta] helicity, associated with the spiralling of the pendant arms, are formed.

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