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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- 作者：Shyamapada Shit ; Joy Chakraborty ; Brajagopal Samanta ; Alexandra M. Z. Slawin ; Volker Gramlich and Samiran Mitra
- 关键词：Co(III) ; Mn(II) ; Cu(II) ; N ; N ; O ; donor hydrazones ; Crystal structures ; Characterization
- 刊名：Structural Chemistry
- 出版年：2009
- 出版时间：August, 2009
- 年：2009
- 卷：20
- 期：4
- 页码：633-642
- 全文大小：538.3 KB
文摘
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.