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Title: Incorporation of lead(II) by copper(II)-salicylaldimine type ligand complexes: Cation– interactions in controlling the distortion of coordination geometry around lead(II)
Authors: Biswas, Saptarshi
Ghosh, Ashutosh
Keywords: Coordination chemistry;Copper;Lead;Heterometallic complexes;Di-Schiff base ligands;Schiff bases;Crystal structure;Cation– interactions
Issue Date: Sep-2011
Publisher: NISCAIR-CSIR, India
Abstract: Two tri-nuclear, hetero-metallic copper(II)-lead(II) complexes, [(CuL1)2Pb(NCS)2] (1) and [(CuL2)2Pb(NCS)2] (2) have been synthesized by reacting the “ligand-complex” [CuL1] and [CuL2] respectively with Pb(CH3COO)2·3H2O and ammonium thiocyanate (where H2L1 = N,N¢-bis(salicylidene)-1,3-propanediamine and H2L2 = N,N¢-bis(-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 (2). The coordination environment around all Cu(II) centres are square planar with different degrees of tetrahedral distortions. There are significant intra- and intermolecular cation- interactions between the phenyl rings of the Schiff base and Cu(II) that seem to control the distortion around Pb(II).
Page(s): 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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