TY - JOUR
T1 - Synthesis, structure, and electrochemistry of trans-[CoIII{(BA) 2pn}(L)2]ClO4 complexes
AU - Meghdadi, Soraia
AU - Amirnasr, Mehdi
AU - Habibi, Mohammad H.
AU - Amiri, Ahmad
AU - Ahmadi, Fatemeh
AU - Kihara, Keiko
AU - Suzuki, Takayoshi
AU - Bijanzadeh, Hamid Reza
N1 - Funding Information:
Acknowledgements Partial support of this work by the Isfahan University of Technology Research Council is gratefully acknowledged.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/10
Y1 - 2008/10
N2 - The structure, spectroscopic, and electrochemical properties of [Co{(BA)2pn}(L)2]ClO4 complexes, where (BA)2pn = N,N'-bis(benzoylacetone)-1,3-propylenediimine dianion and the two ancillary ligands (L) are pyridine, py (1), and 4-methylpyridine, 4-Mepy (2), have been investigated. These complexes have been characterized by elemental analyses, IR, UV-Vis and 1H-NMR spectroscopy. The crystal structure of [Co{(BA)2pn}(py)2]ClO4 (1) has been determined by X-ray diffraction. The coordination geometry around cobalt(III) is best described as a distorted octahedron. The electrochemical reduction of these complexes at a glassy carbon electrode in acetonitrile solution indicates that the first reduction process corresponding to Co III-CoII is electrochemically irreversible, which is accompanied by the dissociation of the axial N(py)-cobalt bonds. This process becomes quasi-reversible upon the addition of excess py ligands. The second reduction step of CoII/I shows reversible behavior and is not influenced by the nature of the axial ligands.
AB - The structure, spectroscopic, and electrochemical properties of [Co{(BA)2pn}(L)2]ClO4 complexes, where (BA)2pn = N,N'-bis(benzoylacetone)-1,3-propylenediimine dianion and the two ancillary ligands (L) are pyridine, py (1), and 4-methylpyridine, 4-Mepy (2), have been investigated. These complexes have been characterized by elemental analyses, IR, UV-Vis and 1H-NMR spectroscopy. The crystal structure of [Co{(BA)2pn}(py)2]ClO4 (1) has been determined by X-ray diffraction. The coordination geometry around cobalt(III) is best described as a distorted octahedron. The electrochemical reduction of these complexes at a glassy carbon electrode in acetonitrile solution indicates that the first reduction process corresponding to Co III-CoII is electrochemically irreversible, which is accompanied by the dissociation of the axial N(py)-cobalt bonds. This process becomes quasi-reversible upon the addition of excess py ligands. The second reduction step of CoII/I shows reversible behavior and is not influenced by the nature of the axial ligands.
UR - http://www.scopus.com/inward/record.url?scp=50949091669&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=50949091669&partnerID=8YFLogxK
U2 - 10.1007/s11243-008-9127-2
DO - 10.1007/s11243-008-9127-2
M3 - Article
AN - SCOPUS:50949091669
VL - 33
SP - 879
EP - 886
JO - Transition Metal Chemistry
JF - Transition Metal Chemistry
SN - 0340-4285
IS - 7
ER -