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Double-stranded monohelical complexes from an unsymmetrical chiral Schiff-base ligand

Double-stranded monohelical complexes from an unsymmetrical chiral Schiff-base ligand

Inorganic Chemistry 47(3): 1120-1126

A new Schiff-base ligand is prepared by a two-step reaction of 3-formylsalicylic acid and (1R, 2R)-diaminocyclohexane in alcoholic solvents. The 1:1 condensation product exists as a zwitterion in the solid state and forms pleated hydrogen-bonded sheets. Metalation of the ligand with divalent iron, nickel, cobalt, and zinc resulted in the formation of double-stranded monohelices with exclusively M-helicity. Each complex has two tridentate ligands, with the carboxylic acid groups remaining uncoordinated. In the crystal lattice, these complexes form extended M-helical strands through intermolecular hydrogen bonding interactions. Metalation of the ligand with copper salts resulted in a distinctly different type of complex, in which the ligand has transformed into a symmetric tetradentate salen ligand with uncoordinated carboxylic acid groups.

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Accession: 052708423

Download citation: RISBibTeXText

PMID: 18166045

DOI: 10.1021/ic702015u

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