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Three new coordination complexes of cobalt(III), manganese(II), and copper(II) with N,N,O-donor hydrazone ligands: syntheses and structural characterizations |
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| Authors: | Shyamapada Shit Joy Chakraborty Brajagopal Samanta Alexandra M. Z. Slawin Volker Gramlich Samiran Mitra |
| Affiliation: | 1. Department of Chemistry, Jadavpur University, Kolkata, 700 032, West Bengal, India 2. Molecular Structure Laboratory, School of Chemistry, University of St. Andrews, Purdie Building, St. Andrews, Fife, KY16 9ST, UK 3. Laboratorium für Kristallographie ETH, Eidgen?ssische Technische Hochschule Zürich, CH-9092, Zürich, Switzerland |
| Abstract: | Three new coordination complexes, 2{[Co(L1)2]ClO4} · 0.5CH3OH (1), [Mn(L2)2] (2), and [Cu(HL2)(L2)]ClO4 · 2H2O (3) have been synthesized from two tridentate N,N,O-donor hydrazone ligands HL1, 2-acetylpyridine-salicyloylhydrazone, and HL2, 2-benzoylpyridine-salicyloylhydrazone, respectively and thoroughly characterized by elemental analysis, FT-IR, UV–Vis, electrochemical, and room temperature magnetic susceptibility measurements. Structures of the complexes have been unequivocally established by single crystal X-ray diffraction technique. Structural analysis reveals that 1 consists of two chemically similar but crystallographically independent cationic [Co(L1)2]+ units and 2 consists of a neutral [Mn(L2)2] molecule while 3 consists of a cationic [Cu(HL2)(L2)]+ unit. Metal ions display distorted octahedral geometry in 1 and 2 while in 3 it shows a distorted square pyramidal geometry. Ligand conformations around the metal ions are stabilized by the presence of intra-ligand hydrogen bonding in all the complexes. Structure of 3 reveals that a perchlorate ion linked to the complex by hydrogen bonding via a water molecule. |
| Keywords: | Co(III) Mn(II) Cu(II) N,N,O-donor hydrazones Crystal structures Characterization |
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