Mononuclear transition metal complexes with sterically hindered carboxylate ligands: Synthesis, structural and spectral properties
- Mononuclear transition metal complexes with sterically hindered carboxylate ligands: Synthesis, structural and spectral properties
- Sethuraman Kannan; Galmari Venkatachala; Ha-Jin Lee; 민병권; Woong Kim; Eunhae Koo; Young Rag; Sungho Yoon
- Mononuclear metal complexes; Sterically hindered carboxylate ligand; 3,5-Dimethylpyrazole; Crystal structures
- Issue Date
- VOL 30, NO 2, 340-346
- The metal coordination geometry in the active site of metalloproteins are very different from the one of
small inorganic complexes, due to the inflexibility of the ligand set from amino acid side chains different
from freely moving ligand set in synthesis. Using the sterically hindered 2,6-di-(p-fluorophenyl)benzoate(
L) ligand, a series of mononuclear Co(II), Ni(II) and Cu(II) complexes of general formula
[M(L)2(Hdmpz)2] (where, Hdmpz = 3,5-dimethyl pyrazole) have been synthesized and characterized by
the variety of spectroscopic methods. A distorted octahedral geometry in case of nickel, tetrahedral
geometry for cobalt and square pyramidal in copper was observed in the X-ray studies, which also
revealed that the uncoordinated oxygen atom of the carboxylate group forms intramolecular hydrogen
bonding with the N–H group of the coordinated 3,5-dimethylpyrazole in case of cobalt and copper.
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