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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 (L<sup>10</sup>), 2-[3-(2′-pyridyl)pyrazol-1-ylmethyl]pyridine (L<sup>5</sup>) and 2,6-bis(pyrazol-1-ylmethyl)pyridine (L<sup>6</sup>), three new mercury(II) complexes – two discrete [(L<sup>10</sup>)Hg<sup>II</sup>(<img src='/image/spc_char/micro.gif' border=0>–Cl)Cl]<sub>2</sub> (<b style="">1</b>) and [(L<sup>5</sup>)Hg<sup>II</sup>Cl<sub>2</sub>]<sub> </sub>(<b style="">2</b>) and a coordination polymeric [(L<sup>6</sup>)Hg<sup>II</sup>Cl<sub>2</sub>]<b style="">·</b>HgCl<sub>2</sub> (<b style="">3</b>), have been synthesized and structurally characterized. In complex (<b style="">1</b>) one of the chlorides from each [(L<sup>10</sup>)Hg<sup>II</sup>Cl<sub>2</sub>] unit acts as a bridge, affording a dichloro-bridged mercury(II) complex with slightly distorted square-pyramidal HgN<sub>2</sub>Cl<sub>3</sub> coordination sphere. The structure of complex (<b style="">2</b>)<b style=""> </b>reveals an almost ideal square-pyramidal HgN<sub>3</sub>Cl<sub>2</sub> coordination sphere. Complex (<b style="">3</b>)<b style=""> </b>has<b style=""> </b>N<sub>3</sub>Cl<sub>2</sub> distorted square-pyramidal coordination around Hg<sup>II</sup> ion with coordination by L<sup>6</sup> (facial mode) and two Cl<sup>–</sup> ions. Notably, in complex (<b style="">3</b>) one HgCl<sub>2</sub> molecule is present with each [(L<sup>6</sup>)Hg<sup>II</sup>Cl<sub>2</sub>] unit. Due to weak interaction by Hg<sup>II</sup>-coordinated Cl<sup>–</sup> ion of “[(L<sup>6</sup>)Hg<sup>II</sup>Cl<sub>2</sub>]” unit to HgCl<sub>2</sub>, complex (<b style="">3</b>) is a coordination polymer. Analysis of crystal packing diagram of complexes (<b style="">1</b>)–(<b style="">3</b>) reveals occurrence of a variety of non-covalent (<img src='/image/spc_char/pi.gif' border=0>–<img src='/image/spc_char/pi.gif' border=0>, C–H<b style=""><sup>…</sup></b><img src='/image/spc_char/pi.gif' border=0> and C–H<b style=""><sup>...</sup></b>Cl) interactions, which play significant role in generating supramolecular architectures of varied topology.
Description: 1248-1256
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.50A(09-10) [September-October 2011]

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