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Title: Incorporation of lead(II) by copper(II)-salicylaldimine type ligand complexes: <span style="color: rgb(35, 31, 32);">Cation–<img src='/image/spc_char/pi.gif' border=0> interactions in controlling the distortion of coordination geometry around lead(II) </span>
Authors: Biswas, Saptarshi
Ghosh, Ashutosh
Keywords: Coordination chemistry
Heterometallic complexes
Di-Schiff base ligands
Schiff bases
Crystal structure
Cation–<img src='/image/spc_char/pi.gif' border=0> interactions
Issue Date: Sep-2011
Publisher: NISCAIR-CSIR, India
Abstract: Two tri-nuclear, hetero-metallic copper(II)-lead(II) complexes, [(CuL<sup>1</sup>)<sub>2</sub>Pb(NCS)<sub>2</sub>] (<b style="">1</b>) and [(CuL<sup>2</sup>)<sub>2</sub>Pb(NCS)<sub>2</sub>] (<b style="">2</b>) have been synthesized by reacting the “ligand-complex” [CuL<sup>1</sup>] and [CuL<sup>2</sup>] respectively with Pb(CH<sub>3</sub>COO)<sub>2</sub>·3H<sub>2</sub>O and ammonium thiocyanate (where H<sub>2</sub>L<sup>1 </sup>= N,N¢-bis(salicylidene)-1,3-propanediamine and H<sub>2</sub>L<sup>2</sup> = N,N¢-bis(<img src='/image/spc_char/alpha.gif' border=0>-methyl­-salicylidene)-1,3-propanediamine are the tetradentate di-Schiff base ligands) in EtOH-water medium. Both complexes have been characterized by X-ray single crystal structural analyses. In both structures, the central Pb(II) is six-coordinate, being bonded to four oxygen atoms from two terminal square planar CuL units and a couple of thiocyanate nitrogen atoms. The geometry around Pb(II) in both complexes is far from ideal octahedron and the distortion is more severe in (<b style="">2</b>). The coordination environment around all Cu(II) centres are square planar with different degrees of tetrahedral distortions. There are significant intra- and intermolecular cation-<img src='/image/spc_char/pi.gif' border=0> interactions between the phenyl rings of the Schiff base and Cu(II) that seem to control the distortion around Pb(II).
Description: 1356-1362
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.50A(09-10) [September-October 2011]

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