Effect of a pentadentate Schiff base on the helical supramolecular structures of (μ-alkoxo)(μ-carboxylato)dicopper(II) complexes

Gupta, Sunita ; Mukherjee, Arindam ; Nethaji, Munirathinam ; Chakravarty, Akhil R. (2005) Effect of a pentadentate Schiff base on the helical supramolecular structures of (μ-alkoxo)(μ-carboxylato)dicopper(II) complexes Polyhedron, 24 (15). pp. 1922-1928. ISSN 0277-5387

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S02775...

Related URL: http://dx.doi.org/10.1016/j.poly.2005.05.015


Two new asymmetrically dibridged dicopper(II) complexes with a pentadentate Schiff base and p-hydroxycinnamate are prepared and structurally characterized by X-ray crystallography. The complexes have an asymmetrically dibridged (μ-alkoxo)(μ-carboxylato)dicopper(II) core with an alkoxo bridge from the Schiff base and the carboxylate showing a three-atom bridging mode. Variable-temperature magnetic studies show the complexes having an antiferromagnetically coupled spin system giving a singlet-triplet energy separation of -160 and -132 cm-1 for 1 and 2, respectively. Complex 1, with a shorter Cu-OR-Cu angle, displays greater antiferromagnetic spin coupling. Besides the Cu-OR-Cu angle, the role of the carboxylate ligand and the supramolecular structure in the spin coupling phenomena is observed. Complex 1 · MeOH shows the formation of intermolecular hydrogen bonds involving the axial methanol and the pentadentate Schiff base terminal oxygen atom. There is additional hydrogen bonding interactions involving the p-hydroxy group of the carboxylate, the lattice methanol and the terminal oxygen atom. The crystal structure of complex 2 · H2O displays the presence of a helical supramolecular structure due to hydrogen bonding interactions involving the pendant p-hydroxy group and the bridging oxygen atom of the carboxylate.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Dicopper(ii) Complex; Schiff Base; Crystal Structure; Supramolecular Helices; Magnetic Properties; Hydrogen Bonds
ID Code:6358
Deposited On:20 Oct 2010 11:04
Last Modified:27 May 2011 04:46

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