Synthetic, spectroscopic and X-ray crystallographic structural study of the monomeric [Cu(pysme)(sac)(MeOH)] and dimeric [Cu(6mptsc)(sac)]2 complexes [pysme=anion of the pyridine-2-carboxaldehyde Schiff base of S-methyldithiocarbazate, 6mptsc=the anion of the 6-methyl-2-pyridinecarbaldehydethiosemicarbazone and sac=the saccharinate anion]
Copyright policy )Synthetic, spectroscopic and X-ray crystallographic structural study of the monomeric [Cu(pysme)(sac)(MeOH)] and dimeric [Cu(6mptsc)(sac)]2 complexes [pysme=anion of the pyridine-2-carboxaldehyde Schiff base of S-methyldithiocarbazate, 6mptsc=the anion of the 6-methyl-2-pyridinecarbaldehydethiosemicarbazone and sac=the saccharinate anion]
New mixed-ligand copper(II) complexes of empirical formulas [Cu(pysme)(sac) (CH3OH)] and [Cu(6mptsc)(sac)](2) have been synthesized and characterized by conductance, magnetic, IR and electronic spectroscopic techniques. X-ray crystallographic structure analyses of these complexes indicate that in both complexes the copper(II) ions adopt a five-coordinate distorted square-pyramidal geometry with an N3SO donor environment. The Schiff bases are coordinated to the copper(II) ions as tridentate NNS chelates via the pyridine nitrogen atom, the azomethine nitrogen atom and the thiolate sulfur atom. In the monomeric [Cu(pysme)(sac)(MeOH)] complex, the saccharinate anion acts as a monodentate ligand coordinating the copper(II) ion via the imino nitrogen atom whereas in the dimeric [Cu(6mptsc)(sac)](2) complex, the sac anion behaves as a bridging bidentate ligand providing the imino nitrogen donor atom to one of the copper(II) ions and the carbonyl oxygen as a weakly coordinated axial ligand atom to the other Cu(II) ion. In both complexes, the copper(II) ions have distorted square-pyramidal environments. The distortion from an ideal square-pyramidal geometry is attributed to the restricted bite angles of the planar tridentate ligand. (C) 2004 Elsevier Ltd. All rights reserved.
- Universiti Brunei Darussalam Brunei Darussalam
- University of Queensland Australia
- University of Queensland Australia
780103 Chemical sciences, Copper(ii) Complexes, Crystallography, Crystal-structures, 250201 Transition Metal Chemistry, Saccharin Complexes, Ligand, 540, Dithiocarbazates, Metal-complexes, Thiosemicarbazone, Nickel(ii), Chemistry, Inorganic & Nuclear, C1, Copper(ii), Chemistry, Inorganic & Nuclear
780103 Chemical sciences, Copper(ii) Complexes, Crystallography, Crystal-structures, 250201 Transition Metal Chemistry, Saccharin Complexes, Ligand, 540, Dithiocarbazates, Metal-complexes, Thiosemicarbazone, Nickel(ii), Chemistry, Inorganic & Nuclear, C1, Copper(ii), Chemistry, Inorganic & Nuclear
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