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Complexation of M–(buffer) x –(OH) y Systems Involving Divalent Ions (Cobalt or Nickel) and Zwitterionic Biological Buffers (AMPSO, DIPSO, TAPS and TAPSO) in Aqueous Solution

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Abstract

The complexation behavior of eight M–(buffer) x –(OH) y systems involving two divalent ions (cobalt and nickel) and four zwitterionic biological buffers (AMPSO, DIPSO, TAPS and TAPSO) were characterized. Complex formation was detected for all eight M–(buffer) x –(OH) y systems studied, but fully defined final models were obtained for only four of these systems. For systems involving cobalt or nickel with AMPSO or TAPS, a complete characterization of the systems was not possible in the studied buffer pH-range.

Metal complexation was studied by glass-electrode potentiometry (GEP) and UV-Vis spectroscopy at 25.0 °C and I=0.1 mol⋅dm−3 KNO3 ionic strength. For the Ni–(L) x –(OH) y and Co–(L) x –(OH) y systems, with L = TAPSO or DIPSO, the proposed final models and overall stability constants were obtained by combining results from both techniques. For the Ni–(L) x –(OH) y systems, the measured values of the stability constants are log 10 β NiL=3.0±0.1 and log 10 β NiL2=4.8±0.1 for L = TAPSO, and log 10 β NiL=2.7±0.1 and log 10 β NiL2=4.6±0.1 for L = DIPSO. For the Co–(L) x –(OH) y systems, the overall stability constants are log 10 β CoL=2.2±0.1, log 10 β CoL2=3.6±0.2 and log 10 β CoL(OH)=7.6±0.1 for L = TAPSO, and log 10 β CoL=2.0±0.1 and log 10 β CoL(OH)=7.8±0.1 for L = DIPSO. For both buffers, the CoL(OH) species is characterized by a major structural rearrangement.

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Authors and Affiliations

  1. REQUIMTE, Department of Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal

    Carina M. M. Machado & Helena M. V. M. Soares

  2. REQUIMTE, Department of Chemistry, Faculty of Science, University of Porto, Rua do Campo Alegre nº 687, 4169-007, Porto, Portugal

    Paula Gameiro

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  1. Carina M. M. Machado
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  2. Paula Gameiro
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  3. Helena M. V. M. Soares
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Correspondence to Helena M. V. M. Soares.

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Machado, C.M.M., Gameiro, P. & Soares, H.M.V.M. Complexation of M–(buffer) x –(OH) y Systems Involving Divalent Ions (Cobalt or Nickel) and Zwitterionic Biological Buffers (AMPSO, DIPSO, TAPS and TAPSO) in Aqueous Solution. J Solution Chem 37, 603–617 (2008). https://doi.org/10.1007/s10953-008-9265-3

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  • DOI: https://doi.org/10.1007/s10953-008-9265-3

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