Chiral heterocyclic ligands. XIV. Control of directionality in silver coordination polymers through ligand design

Department of Chemistry, University of Canterbury, Christchurch, Canterbury, New Zealand
Dalton Transactions (Impact Factor: 4.2). 12/2006; DOI: 10.1039/b611622c
Source: PubMed


Four C2-symmetric homochiral ligands derived from camphor was studied to produce linear chain and ladder silver coordination polymers, where the directionality and polarization can be controlled by differences in ligand design. An important requirement for the coordination polymers is that the material be non-centrosymmetric and are recognized as offering considerable potential as functional materials. The C2-axis within the ligand is perpendicular to the plane of the central pyrazine ring, making the two nitrogen donors equivalent. The ligands have been prepared from (1R)-(+)-camphor by conversion to camphorquinone and reaction with ammonium acetate and hexamethylnetetramine in acetic acid. The compound crystallizes in the orthorhombic space group P21,21,21 with two bridging ligands, two silver atoms, two nitrate counterions, and two disordered water molecules in the asymmetric unit.

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