Investigation of metal–buffer interactions using isothermal titration calorimetry
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- 作者：D. Wyrzykowski (1)
B. Pilarski (2)
D. Jacewicz (1)
L. Chmurzyński (1) - 关键词：Isothermal titration calorimetry ; Metal–buffer interactions ; Potentiometric titration ; Proton exchange ; Thermodynamic parameters
- 刊名：Journal of Thermal Analysis and Calorimetry
- 出版年：2013
- 出版时间：March 2013
- 年：2013
- 卷：111
- 期：3
- 页码：1829-1836
- 全文大小：421KB
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B. Pilarski (2)
D. Jacewicz (1)
L. Chmurzyński (1)
1. Faculty of Chemistry, University of Gdańsk, Sobieskiego 18, 80-952, Gdańsk, Poland
2. P.P.H.U. Cerko s.c, Afrodyty 9, 80-299, Gdańsk, Poland - ISSN：1572-8943
文摘
Isothermal titration calorimetry (ITC) and potentiometric titration (PT) methods were used to study the interactions of cobalt(II) and nickel(II) ions with buffer substances 2-(N-morpholino)ethanesulfonic acid (Mes), dimethylarsenic acid (Caco), and piperazine-N,N-bis(2-ethanesulfonic acid) (Pipes). Based on the results of PT data, the stability constants were calculated for the metal–buffer complexes (T?=?298.15?K, ionic strength I?=?100?mM NaClO4). Furthermore, calorimetric measurements (ITC) were run in 100?mM Mes, Caco, and Pipes solutions with pH 6, at 298.15?K. The enthalpies (ΔH) of the metal–buffer complexation reactions were calculated indirectly by displacement titration using nitrilotriacetic acid (H3NTA) as a strong-binding, competitive ligand. Finally, to verify obtained results, the number of protons released by H3NTA due to complexation of the cobalt(II) and nickel(II) ions was determined from calorimetric data and compared with results of calculations.