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

{-1,4,7,10-Tetrakis[(S)-2-hydroxypropyl-O]-1,4,7,10-tetraazacyclododecane-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 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 helicity, associated with the spiralling of the pendant arms, are formed.

Online 22 December 2001

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