Polymeric and monomeric dipicolinate complexes with 4-hydroxymethyl pyridine: spectral, structural, thermal and electrochemical characterization |
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Authors: | İbrahim Uçar İclal Bulut Ahmet Bulut Ahmet Karadağ |
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Institution: | 1. Department of Physics, Faculty of Arts and Sciences, Ondokuzmay?s University, 55139, Kurupelit, Samsun, Turkey 2. Department of Chemistry, Faculty of Arts and Sciences, Ondokuzmay?s University, 55139, Kurupelit, Samsun, Turkey 3. Department of Chemistry, Faculty of Arts and Sciences, Gaziosmanpasa University, Ta?l??iftlik, 60240, Tokat, Turkey
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Abstract: | Polymeric copper(II), Cu(μ-dpc)(μ-4-hymp)]
n
(1), and monomeric nickel(II), Ni(dpc)(4-hymp)(H2O)2]·H2O (2), (dpc: dipicolinate, 4-hymp: 4-hydroxymethyl pyridine), dipicolinate complexes have been prepared and characterized
by spectroscopic (IR, UV–Vis, EPR), thermal (TG/DTA), X-ray diffraction technique and electrochemical methods. In both the
dipicolinate complexes, the dpc dianion acts as a tridentate ligand. In polymeric copper(II) complex, the 4-hymp and dpc ligands
adopt a bridging position between the Cu(II) centers, forming the elongated octahedral geometry. The polymeric chains are
linked to one another via O–H···O hydrogen bond interactions, forming the 3-D polymeric structure. The Ni(II) ion is bonded
to dpc ligand through pyridine N atom together with one O atom of each carboxylate group, two aqua ligands and N pyridine
atom of 4-hymp, forming the distorted octahedral geometry. The Ni(II) complexes are connected to one another via O–H···O hydrogen
bonds, forming R
42(18) motifs in 2-D pattern. The powder EPR spectra of copper(II) complex have indicated that the paramagnetic center is in
rhombic symmetry with the Cu2+ ion having distorted octahedral geometry. IR and UV–Vis spectroscopes all agree with the observed crystal structure. |
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Keywords: | Dipicolinate complexes X-ray diffraction EPR UV– Vis IR Cyclic voltammetry |
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