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Title: Discrete monomeric and chloride-bridged dimeric and 1D coordination polymeric mercury(II) complexes of a class of pyridyl-pyrazole ligands with variable denticity and flexibility
Authors: Javed, Saleem
Balamurugan, V
Jacob, Wilson
Sharma, Anuj Kumar
Mukherjee, Rabindranath
Keywords: Coordination polymers
Pyridyl-pyrazole ligands
Bidentate ligands
Tridentate ligands
Crystal structures
Non-covalent interactions
Emission spectra
Issue Date: Sep-2011
Publisher: NISCAIR-CSIR, India
Abstract: Using a class of pyridyl-pyrazole ligands with variable denticity and flexibility, i. e., 1-benzyl-[3-(2′-pyridyl)]pyrazole (L10), 2-[3-(2′-pyridyl)pyrazol-1-ylmethyl]pyridine (L5) and 2,6-bis(pyrazol-1-ylmethyl)pyridine (L6), three new mercury(II) complexes – two discrete [(L10)HgII(–Cl)Cl]2 (1) and [(L5)HgIICl2] (2) and a coordination polymeric [(L6)HgIICl2]·HgCl2 (3), have been synthesized and structurally characterized. In complex (1) one of the chlorides from each [(L10)HgIICl2] unit acts as a bridge, affording a dichloro-bridged mercury(II) complex with slightly distorted square-pyramidal HgN2Cl3 coordination sphere. The structure of complex (2) reveals an almost ideal square-pyramidal HgN3Cl2 coordination sphere. Complex (3) has N3Cl2 distorted square-pyramidal coordination around HgII ion with coordination by L6 (facial mode) and two Cl ions. Notably, in complex (3) one HgCl2 molecule is present with each [(L6)HgIICl2] unit. Due to weak interaction by HgII-coordinated Cl ion of “[(L6)HgIICl2]” unit to HgCl2, complex (3) is a coordination polymer. Analysis of crystal packing diagram of complexes (1)–(3) reveals occurrence of a variety of non-covalent (, C–H and C–H...Cl) interactions, which play significant role in generating supramolecular architectures of varied topology.
Page(s): 1248-1256
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-0975(Online); 0376-4710(Print)
Source:IJC-A Vol.50A(09-10) [September-October 2011]

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