Gd. Hosken et Rd. Hancock, VERY STRONG AND SELECTIVE COMPLEXATION OF SMALL METAL-IONS BY A HIGHLY PREORGANISED OPEN-CHAIN BISPIDINE-BASED LIGAND, Journal of the Chemical Society, Chemical Communications, (11), 1994, pp. 1363-1364
Synthesis of bis(2-pyridylmethyl)-3,7-diazabicyclo[3.3.1]nonane DPB, w
ith very rigid nitrogen-bridge reinforcement gives an adamantane-like
structure once a metal ion is coordinated to DPB, and shows how remark
able stability enhancement and selectivity for metal ions on the basis
of size can be achieved in non-macrocyclic ligands.