Hairpin helicates: a missing link between double-helicates and trefoil knots

Dalton Trans. 2005 Apr 7:(7):1168-75. doi: 10.1039/b500209e. Epub 2005 Feb 22.

Abstract

We have prepared a novel ligand in which two qpy metal-binding domains are linked by a polyoxyethylene spacer. The new ligand reacts with copper(ii) salts to form dinuclear double helicates with a hairpin structure. The hairpin complex and a model complex have been structurally characterised. The hairpin structure is formed regioselectively as the head-to-tail (HT) stereoisomer. Detailed electrochemical and spectroelectrochemical studies of the complexes are reported.