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Title: Synthesis, spectroscopic and crystallographic studies on two copper(II) benzimidazole complexes: Supramolecular frameworks built from N-H ... O, N-H ... Cl and O-H ... Cl hydrogen bonds
Authors: Mijanuddin, Md.
Gangopadhya, Sumana
Mondal, Swastik
Mukherjee, Monika
Ali, Mahammad
Issue Date: Apr-2006
Publisher: NISCAIR-CSIR, India
IPC Code: Int. Cl.8 C07F1/08
Abstract: The tridentate ligands 2,6-bis(benzimidazole-2'-yl)pyridine (L1) and N,N-bis(benzimidazole-2'-yl-methyl )amine (L2) with N3 donor set form the corresponding mononuclear [Cu (L1)(ClO4)(Cl)].H2O (1) and [Cu (L2)(ClO4)(Cl)].H2O (2) complexes, which have been characterized by elemental analysis. UV-Vis spectra, IR , EPR and magnetic moment studies. Single crystal X-ray structure studies for both the complexes show that coordination geometrics around the copper centre are best described as distorted square pyramidal with three nitrogen atoms of tridentatc ligand and a chloride ion defining the equatoriial planes. The apical positions in the complexes are occupied by a perchlorate O atom in 1 and a chloride ion in 2. Metal directed assembly of infinite two-dimensional supramolecular network stabilizes the crystal structures of both complexes in the solid state. The global magnetic interactions in complexes 1 and 2 are found to be paramagnetic with μeff values of 1.65 BM and 1.63BM, respectively, which are typical for a Cu(II) d9 system.
Page(s): 858-863
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections: IJC-A Vol.45A(04) [April 2006]

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