Journal
JOURNAL OF SOLUTION CHEMISTRY
Volume 42, Issue 12, Pages 2296-2309Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10953-013-0107-6
Keywords
Stability constant; Iron(III); Buffers; TRIS based; Morpholine based; Potentiometric
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Funding
- National Science Council, Taiwan [NSC99-2811-E-011-023]
- National Taiwan University of Science Technology
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The complexation equilibria of Fe(III) with two buffer families, which are ubiquitous in biological system studies, were studied by potentiometric measurements at a constant ionic strength of I = 0.1 mol center dot dm(-3) NaNO3 in aqueous solutions at 298.15 K. The members of TRIS family are tris(hydroxymethyl)aminomethane (TRIS), N-[tris(hydroxymethyl)methyl]-2-aminoethanesulfonic acid (TES), N-[tris(hydroxymethyl)methyl]-3-aminopropanesulfonic acid (TAPS), N-[tris(hydroxymethyl)methyl]-3-amino-2-hydroxypropanesulfonic acid (TAPSO), and N-tris(hydroxymethyl)methyl-4-aminobutanesulfonic acid (TABS) buffers. The members of morpholine family are 4-morpholineethanesulfonic acid (MES), 4-morpholinepropanesulfonic acid (MOPS), 3-morpholino-2-hydroxypropanesulfonic acid (MOPSO), and 4-(N-morpholino) butanesulfonic acid (MOBS) buffers. The overall stability constants were determined from pH-metric data using the least-squares curve-fitting program HYPERQUAD 2008. Based on the best-fit results, the species formed at equilibrium are ML, ML2, ML2H-1, and ML3 in the systems with TRIS family buffers. The complex species ML, ML2, ML2H-1, and MLH-1 are formed in the MOPSO-containing system, while ML, ML2, and ML2H-1 are formed in the systems with MES, MOPS, and MOBS. The stabilities of the complexes fall in the order TABS > TRIS > TAPS > TAPSO > TES and MOBS > MOPS > MOPSO > MES for the TRIS family and morpholine families, respectively.
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