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Polyaza metacyclophanes as ditopic anion receptors

Ilioudis, C.A.; Steed, J.W.

Authors

C.A. Ilioudis



Abstract

Five macrocyclic polyaza metacyclophanes L-1 - L-5 prepared by dipode coupling of the tosylated precursors have been studied. The basicity of the ligands has been measured potentiometrically and their ability to complex halides and perchlorate has been studied in the solid state by X-ray crystallography. The results reveal that the ligands generally act as ditopic halide receptors with even the largest, L5, being too small to envelop the anion. The ligand's basicity behaviour parallels that observed for related para-analogues. Despite the ready crystallisation o fluoride, HF2-, chloride, bromide, iodide and triiodide salts in the solid state, there appears to be little afinity for halides in aqueous solution in the pH range accessible via potentiometry. The results do give a detailed insight into the role of the aryl ring in restricting the conformational. exibility of the ligands and, hence, the ability to chelate perching anions.

Citation

Ilioudis, C., & Steed, J. (2005). Polyaza metacyclophanes as ditopic anion receptors. Organic and Biomolecular Chemistry, 3(16), 2935-2945

Journal Article Type Article
Publication Date 2005
Journal Organic and Biomolecular Chemistry
Print ISSN 1477-0520
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 3
Issue 16
Pages 2935-2945