Synthesis, structure, and electrochemistry of trans-[CoIII{(BA) 2pn}(L)2]ClO4 complexes

Soraia Meghdadi, Mehdi Amirnasr, Mohammad H. Habibi, Ahmad Amiri, Fatemeh Ahmadi, Keiko Kihara, Takayoshi Suzuki, Hamid Reza Bijanzadeh

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish
Pages (from-to)879-886
Number of pages8
JournalTransition Metal Chemistry
Volume33
Issue number7
DOIs
Publication statusPublished - Oct 2008

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Electrochemistry
Ligands
Cobalt
Glassy carbon
Acetonitrile
Electrochemical properties
Pyridine
Nuclear magnetic resonance spectroscopy
Crystal structure
X ray diffraction
Electrodes
Geometry
perchlorate

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Meghdadi, S., Amirnasr, M., Habibi, M. H., Amiri, A., Ahmadi, F., Kihara, K., ... Bijanzadeh, H. R. (2008). Synthesis, structure, and electrochemistry of trans-[CoIII{(BA) 2pn}(L)2]ClO4 complexes. Transition Metal Chemistry, 33(7), 879-886. https://doi.org/10.1007/s11243-008-9127-2

Synthesis, structure, and electrochemistry of trans-[CoIII{(BA) 2pn}(L)2]ClO4 complexes. / Meghdadi, Soraia; Amirnasr, Mehdi; Habibi, Mohammad H.; Amiri, Ahmad; Ahmadi, Fatemeh; Kihara, Keiko; Suzuki, Takayoshi; Bijanzadeh, Hamid Reza.

In: Transition Metal Chemistry, Vol. 33, No. 7, 10.2008, p. 879-886.

Research output: Contribution to journalArticle

Meghdadi, S, Amirnasr, M, Habibi, MH, Amiri, A, Ahmadi, F, Kihara, K, Suzuki, T & Bijanzadeh, HR 2008, 'Synthesis, structure, and electrochemistry of trans-[CoIII{(BA) 2pn}(L)2]ClO4 complexes', Transition Metal Chemistry, vol. 33, no. 7, pp. 879-886. https://doi.org/10.1007/s11243-008-9127-2
Meghdadi, Soraia ; Amirnasr, Mehdi ; Habibi, Mohammad H. ; Amiri, Ahmad ; Ahmadi, Fatemeh ; Kihara, Keiko ; Suzuki, Takayoshi ; Bijanzadeh, Hamid Reza. / Synthesis, structure, and electrochemistry of trans-[CoIII{(BA) 2pn}(L)2]ClO4 complexes. In: Transition Metal Chemistry. 2008 ; Vol. 33, No. 7. pp. 879-886.
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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.

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