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 journalArticlepeer-review

8 Citations (Scopus)


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
Issue number7
Publication statusPublished - Oct 2008

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Metals and Alloys
  • Materials Chemistry


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