Helical vs. zigzag coordination polymer: influence of structural preference of metal-ion coordination geometry

Balamurugan, V. ; Mukherjee, Rabindra Nath (2006) Helical vs. zigzag coordination polymer: influence of structural preference of metal-ion coordination geometry Inorganica Chimica Acta, 359 (5). pp. 1376-1382. ISSN 0020-1693

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00201...

Related URL: http://dx.doi.org/10.1016/j.ica.2005.09.031

Abstract

Two new coordination polymers [(L6)CoCl2] (1) and [(L6)CdCl2] (2) (L6 = α,α'-bis(pyrazolyl)-m-xylene) have been synthesized and characterized by X-ray crystallography. Structural analysis of 1 (space group P21) revealed that each Co(II) center is coordinated by two chloride ions and two pyrazole nitrogens from two different L6 ligands, giving rise to pseudo-tetrahedral coordination environment around Co(II). For this structure 1D helical polymeric chain running along crystallographic 21 axis is observed. While for 2 (space group ), each Cd(II) center is coordinated by two chloride ions, two pyrazole nitrogens from two different L6 ligands, and a chloride ion from the adjacent layer. It provides distorted trigonal bipyramidal geometry around Cd(II), which leads to the formation of a 2D zigzag polymer. In continuation of our recent activity on inorganic crystal engineering, from the standpoint of metal-ligand coordination chemistry and C-H...Cl2MII hydrogen bonding, in this work we have investigated the potential of coordination tectons 1 and 2 in bringing about generality in helix/zigzag network formation, strengthened primarily by C-H···Cl hydrogen-bonding interactions.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Coordination Polymer; α,α'-bis(pyrazolyl)-m-xylene; Co(II) and Cd(II) Complexes; Crystal Structures; C-H···Cl Interactions
ID Code:26013
Deposited On:04 Dec 2010 10:39
Last Modified:02 Mar 2011 13:05

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