Studies of bicarbonate binding by dinuclear and mononuclear Ni(II) complexes

Rachel Newell, Aaron Appel, D. L. DuBois, M. Rakowski DuBois

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11 Citations (Scopus)

Abstract

Bicarbonate ion reacts with the dinuclear nickel(II) complex containing the taec ligand (taec = N,N′,N″,N′″-tetrakis-(2-aminoethyl) -1,4,8,11-tetraazacyclotetradecane) in buffered aqueous solution to form the μ-η22-carbonate complex with a large effective binding constant for bicarbonate ion, log KB = 4.39 at pH = 7.4. In contrast, the dinuclear nickel(II) complex containing the o-xyl-DMC2 ligand (o-xyl-DMC2 = α,α′- bis(5,7-dimethyl-1,4,8,11-tetraazacyclotetradecan-6-yl)-o-xylene) does not react with bicarbonate or carbonate ion in aqueous solution. In propylene carbonate, the reaction of [Ni2(o-xyl-DMC2)]4+ with bicarbonate proceeds rapidly to form the μ-η1, η1-carbonate complex. The structure of this carbonate complex has been determined by an X-ray diffraction study that confirms the μ-η11-carbonate binding mode. A mononuclear analogue of [Ni2(taec)]4+, [Ni(2,3,2-tetraamine)] 2+ does not form a detectable mononuclear or dinuclear product with bicarbonate ion in aqueous solution, but [NiDMC]2+ (DMC = 5,7-dimethyl-1,4,8,11-tetraazacyclotetradecane) reacts slowly with carbonate ion in aqueous solution to form a 2:1 complex.

Original languageEnglish
Pages (from-to)365-373
Number of pages9
JournalInorganic Chemistry
Volume44
Issue number2
DOIs
Publication statusPublished - Jan 24 2005

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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