Ring size effects on the chemical properties of tervalent nickel complexes with tetra-aza macrocyclic ligands in aqueous solutions. An electrochemical and pulse radiolytic study

Nusrallah Jubran, Dan Meyerstein, Jacob Koresh, Haim Cohen

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Electrochemical oxidation and oxidation by hydroxyl radicals of the divalent nickel complexes of 1,4,7,10-tetra-azacyclotetradecane and 1,4,8,12-tetra-azacyclopentadecane in acidic aqueous solutions containing perchlorate or sulphate anions are reported. The properties of the tervalent complexes thus formed are described. The results are compared with those reported earlier for other tervalent nickel complexes with tetra-aza macrocyclic ligands. The results indicate that neither the redox potentials nor the half-lives of the tervalent complexes are directly related to the cavity size of the ligand or its ligand-field strength. It is suggested that the detailed conformation of the macrocyclic ligands has a profound effect on the properties of the tervalent complexes. The difference in the factors affecting the chemical properties of the mono- and ter-valent complexes is discussed.

Original languageEnglish
Pages (from-to)2509-2513
Number of pages5
JournalJournal of the Chemical Society. Dalton Transactions
Issue number12
DOIs
StatePublished - 1 Jan 1986

ASJC Scopus subject areas

  • Chemistry (all)

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