Chiral supramolecular metal-organic architectures from dinuclear copper complexes

Two new chiral dinuclear Cu(II) complexes [Cu2(μ-Cl)2(HL1)2] · C2H5OH (1) and [Cu2(μ-Cl)2(HL2)2] · CH3OH (2), have been synthesized and structurally characterized, where the chiral ligands H2L1 and H2L2 are derived from the chiral amino alcohols (S)-(−)-2-amino-3-phenyl-1-propanol and (S)-(+)-2-phenylglycinol. Single-crystal X-ray crystallographic analyses revealed that in these complexes, the dominant hydrogen bonding property of metal bound chloride anion directs the self assembly of complex molecules through C–H···Cl hydrogen bonding interactions leading to the formation of intriguing hydrogen bonded metallo-supramolecular architectures in their respective crystal lattices. The supramolecular systems described here belong to the rare class of metal-organic architectures that are formed as a result of metal directed hydrogen bonding interactions among chiral complex molecules. Complexes 1 and 2 are further characterized by IR, ESR, UV–Vis and CD spectroscopy.

Two new chiral dinuclear copper complexes are derived from chiral amino alcohol based ligands and CuCl2 · 2H2O. Intriguing chiral supramolecular metal-organic architectures are identified in their solid state structures as a result of C–H···Cl–Cu directed H-bonding interactions. Also, the ligand structure found to control the supramolecular structures in these complexes.Figure optionsDownload as PowerPoint slide