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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/14299

Title: Varying structural motifs in oxyanions (NO(3)(-), CO(3)(2-)) and phenoxyacetate (PhOAc(-)) bridged coordination polymers derived from alkoxo-bridged dicopper building blocks with {Cu(2)O(2)} core
Authors: MOBIN, SM
SRIVASTAVA, AK
MATHUR, P
LAHIRI, GK
Keywords: PHENOXYALKANOIC ACID INTERACTIONS
METAL-ORGANIC FRAMEWORKS
CRYSTAL-STRUCTURES
MAGNETIC-PROPERTIES
COPPER(II) COMPLEXES
MOLECULAR-STRUCTURE
HYDROTHERMAL SYNTHESIS
CU-II
FERROMAGNETIC INTERACTIONS
SELECTIVE SORPTION
Issue Date: 2011
Publisher: ROYAL SOC CHEMISTRY
Citation: RSC ADVANCES,1(5)893-902
Abstract: The oxyanions (NO(3)(-), CO(3)(2-)) and phenoxyacetate (PhOAc(-)) bridged three 1D-coordination polymeric chains, {[Cu(2)(mu-hep)(2)(mu-NO(3))](2)}(n) (1), {[Cu(2)(mu-hep)(2)(H(2)O)(2)]center dot 2H(2)O(mu-CO(3))}(n) (3) and {[Cu(2)(mu-hep)(2)(mu-PhOAc(-))](2)}(n) (2) (hep-H = 2-(2-hydroxyethyl)pyridine) have been synthesized. In 1-3 the alkoxide bridged dicopper building units, [Cu(m-hep)](2) with Cu(2)O(2) core, are linked via the respective anions. Detailed structural analysis reveals that in 1 or 2, two units of NO(3)(-) (1) or PhOAc 2 (2), respectively, bind with the four copper ions in two adjacent alkoxide bridged dimeric units in head-to-head and tail-to-tail fashion and the same binding mode continues along the polymeric chain. This in effect yields a 12-membered metallacyclic ring in between two dimeric core units. However, in 3 only one CO(3)(2-) group bridges the two copper centres associated with the two neighbouring alkoxide bridged dimeric units in head-to-tail mode which in turn forms a zig-zag polymeric chain. Two coordinated and two lattice water molecules from two adjacent polymeric layers in the structure of 3 form water tetramers. Furthermore, the interaction of water tetramer with the uncoordinated C=O group of the bridging CO(3)(2-) develops an additional zig-zag chain which is being trapped between the two outer zig-zag coordination polymeric chains in 3. The polymeric chains in 1-3 further develop a 2D-network pattern via an extensive non-covalent hydrogen bonding as well as C-H center dot center dot center dot pi and pi center dot center dot center dot pi interactions.
URI: http://dx.doi.org/10.1039/c1ra00155h
http://dspace.library.iitb.ac.in/jspui/handle/100/14299
ISSN: 2046-2069
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