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Issue 5, 2011
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Varying structural motifs in oxyanions (NO3, CO32) and phenoxyacetate (PhOAc) bridged coordination polymers derived from alkoxo-bridged dicopper building blocks with {Cu2O2} core

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Abstract

The oxyanions (NO3, CO32) and phenoxyacetate (PhOAc) bridged three 1D-coordination polymeric chains, {[Cu2(μ-hep)2(μ-NO3)]2}n (1), {[Cu2(μ-hep)2(H2O)2]·2H2O(μ-CO3)}n (3) and {[Cu2(μ-hep)2(μ-PhOAc)]2}n (2) (hep-H = 2-(2-hydroxyethyl)pyridine) have been synthesized. In 13 the alkoxide bridged dicopper building units, [Cu(μ-hep)]2 with Cu2O2 core, are linked via the respective anions. Detailed structural analysis reveals that in 1 or 2, two units of NO3 (1) or PhOAc (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 CO32group 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[double bond, length as m-dash]O group of the bridging CO32 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 13 further develop a 2D-network pattern via an extensive non-covalent hydrogen bonding as well as C–H⋯π and π⋯π interactions.

Graphical abstract: Varying structural motifs in oxyanions (NO3−, CO32−) and phenoxyacetate (PhOAc−) bridged coordination polymers derived from alkoxo-bridged dicopper building blocks with {Cu2O2} core

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Publication details

The article was received on 09 May 2011, accepted on 10 Jul 2011 and first published on 12 Sep 2011


Article type: Paper
DOI: 10.1039/C1RA00155H
Citation: RSC Adv., 2011,1, 893-902

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    Varying structural motifs in oxyanions (NO3, CO32) and phenoxyacetate (PhOAc) bridged coordination polymers derived from alkoxo-bridged dicopper building blocks with {Cu2O2} core

    S. M. Mobin, A. K. Srivastava, P. Mathur and G. K. Lahiri, RSC Adv., 2011, 1, 893
    DOI: 10.1039/C1RA00155H

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