Jump to main content
Jump to site search

Issue 13, 2013
Previous Article Next Article

Dinuclear mixed-valence CoIIICoII complexes derived from a macrocyclic ligand: unique example of a CoIIICoII complex showing catecholase activity

Author affiliations

Abstract

The work in this paper presents the syntheses, characterization, catecholase activity, and electrospray ionization mass spectroscopic (ESI-MS positive) study of three mixed-valence dinuclear CoIIICoII complexes of composition [CoIIICoIIL(N3)3]·CH3CN (1), [CoIIICoIIL(OCN)3]·CH3CN (2), and [CoIIICoIIL(μ-CH3COO)2](ClO4) (3), derived from a tetraimino diphenolate macrocyclic ligand H2L, obtained on [2 + 2] condensation of 4-ethyl-2,6-diformylphenol and 2,2′-dimethyl-1,3-diaminopropane. While 1 and 2 are diphenoxo-bridged, 3 is a heterobridged bis(μ-phenoxo)bis(μ-acetate) system. Utilizing 3,5-di-tert-butyl catechol (3,5-DTBCH2) as the substrate, the catecholase activity of all the three complexes has been checked in methanol/acetonitrile/N,N-dimethyl formamide. While 2 and 3 are inactive, complex 1 shows catecholase activity with turnover numbers of 482.16 h−1 and 45.38 h−1 in acetonitrile and methanol, respectively. Electrospray ionization mass (ESI-MS positive) spectra of complexes 1–3 have been recorded in acetonitrile solutions and the positive ions have been well characterized. The ESI-MS positive spectrum of complex 1 in the presence of 3,5-DTBCH2 has also been recorded and, interestingly, two positive ions [CoIIICoIIL(N3)2(3,5-DTBCH)H]+ and [CoIICoIIL(μ-3,5-DTBCH2−)Na]+ have been identified.

Graphical abstract: Dinuclear mixed-valence CoIIICoII complexes derived from a macrocyclic ligand: unique example of a CoIIICoII complex showing catecholase activity

Back to tab navigation

Supplementary files

Publication details

The article was received on 03 Nov 2012, accepted on 22 Dec 2012 and first published on 03 Jan 2013


Article type: Paper
DOI: 10.1039/C2DT32629A
Citation: Dalton Trans., 2013,42, 4561-4569
  •   Request permissions

    Dinuclear mixed-valence CoIIICoII complexes derived from a macrocyclic ligand: unique example of a CoIIICoII complex showing catecholase activity

    S. Majumder, S. Mondal, P. Lemoine and S. Mohanta, Dalton Trans., 2013, 42, 4561
    DOI: 10.1039/C2DT32629A

Search articles by author

Spotlight

Advertisements