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Bis-(µ-saccharide-C-2-oxo) dinuclear Cu(II) complexes of 4,6-O-butylidene/ethylidene-N-(-hydroxynaphthylidene/o-hydroxybenzylidene/5-bromo-o-hydroxybenzylidene)--D-glucopyranosylamine: structural aspects and data correlations

Gudneppanavar, Rajsekhar and Sah, Ajay K and Rao, Chebrolu P and Guionneau, Philippe and Bharathy, Muktha and Row, Guru TN (2003) Bis-(µ-saccharide-C-2-oxo) dinuclear Cu(II) complexes of 4,6-O-butylidene/ethylidene-N-(-hydroxynaphthylidene/o-hydroxybenzylidene/5-bromo-o-hydroxybenzylidene)--D-glucopyranosylamine: structural aspects and data correlations. In: Dalton Transactions (15). pp. 3126-3135.

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Abstract

A total of .ve dinuclear copper complexes were synthesized using 4,6-O-butylidene/ethylidene-N-(α-hydroxynaphthylidene/ o-hydroxybenzylidene/5-bromo o-hydroxybenzylidene)-β-.-glucopyranosylamine. Upon recrystallisation from di.erent solvents, viz., dmso/MeOH/pyridine, seven di.erent dinuclear copper complexes were generated, wherein the geometry around one or both of the copper centers changes from square planar to square pyramidal due to the binding of solvent molecule as the .fth ligand. The ligands and their complexes were characterized by elemental analysis,${ 1}H$ and${ 13}^C $NMR, FT-IR, FABMS, UV-Vis, optical rotation, CD and magnetic susceptibility measurements. The 3D structures of all the seven complexes were established by single crystal XRD. All the complexes are neutral and dinuclear with the metal to the glycosylamine ratio being 1 : 1. Each glycosylamine acts as tridentate with di-negative charge and bridges between the two copper centers through the C-2-oxo group of the saccharide part and further the coupling between the copper centers is antiferromagnetic. At least four di.erent types of$ Cu_{2}O_{2}^{2}$ core structures were identi.ed depending upon the presence or absence of a .fth ligand at the Cu(..) center. The $ beta-{4}^C_{1}$-pyranose form of the glycosylamine is retained even in complexes. The dinuclear complex is stabilized through intra-complex hydrogen bond interaction. The inter-molecular C–H...O interactions are manifested in the formation of a helical structure where the water molecules occupy the cavity. The structural diversity observed in the complexes and several data correlations are discussed in detail.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Royal Society Chemistry
Keywords: CRYSTAL-STRUCTURE;COPPER(II) COMPLEXES;N-GLYCOSYLAMINES; METAL-IONS;COORDINATION;LIGANDS;4,6-O-BUTYLIDENE-ALPHA-D-GLUCOPYRANOSE;DERIVATIVES;PRODUCTS;DESIGN
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 08 Dec 2008 10:19
Last Modified: 05 Jul 2011 06:53
URI: http://eprints.iisc.ernet.in/id/eprint/16558

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