Kinetics of Dissociation of Iron(III) Complexes of Tiron in Aqueous Acid
Abstract
The kinetics of dissociation of the mono, bis, and tris complexes of Tiron (1,2-dihydroxy-3,5-benzenedisulfonate) have been studied in acidic aqueous solutions in 1.0 M HClO(4)/NaClO(4), as a function of [H(+)] and temperature. In general, the kinetics can be explained by two reactions, (H(2)O)Fe(L)(n)(-1) + H(2)L right arrow over left arrow (H(2)O)Fe(L(n)H) + H(+) (k(n), k(-n)) and (HO)Fe(L)(n)(-1) + H(2)L right arrow over left arrow (H(2)O)Fe(L(n)H) (k(n)', k(-n)'), a rapid equilibrium, (H(2)O)Fe(L(n)H) right arrow over left arrow (H(2)O)Fe(L)(n) + H(+) (K(cn)), and the formation constant (H(2)O)Fe(L)(n)(-1) + H(2)L right arrow over left arrow (H(2)O)Fe(L)(n) + 2H(+). For n = 1, the reaction was observed at 670 nm, and at [H(+)] of 0.05-0.5 M at temperatures of 2.0, 14.0, 25.0, and 36.7 degrees C. For n = 2, the analogous conditions are 562 nm, at [H(+)] of 1.5 x 10(-3) to 1.4 x 10(-2) M at temperatures of 2.0, 9.0, and 14.0 degrees C. For n = 3, the conditions are 482 nm, at pH 4.5-5.7 in 0.02 M acetate buffer at temperatures of 1.8, 8.0, and 14.5 degrees C. The rate or equilibrium constants (25 degrees C) with DeltaH or DeltaH degrees (kcal mol(-1)) and DeltaS or DeltaS degrees (cal mol(-1) K(-1)) in brackets are as follows: for n = 1, k(1) = 2.3 M(-1) s(-1) (8.9, -27.1), k(-1) = 1.18 M(-1) s(-1) (4.04, -44.8), K(c1) = 0.96 M (-9.99, -33.6), K(f1) = 2.01 M (-5.14, -15.85); for n = 2, k(-2)/K(c2) = 1.9 x 10(7) (19.9, 41.5) and k(-2)'/K(c2) = 1.85 x 10(3) (1.4, -38.8) and a…
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Coordination bonding and strong chelating bonding with transition metal compounds occur between catechol or diketone groups on the polydopamine coating layer and the interface of inorganic biosubstitutes, along with protein cross-linking.
“Such coordination bonding and strong chelating bonding with transition metal compound occur between catechol or diketone groups on the PDA coating layer and the interface of inorganic biosubstitutes along with the protein cross-linking [61–66].”
From Polydopamine-Assisted Surface Modification for Bone Biosubstitutes (2016) · cites this paper as [64]
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Polydopamine-Assisted Surface Modification for Bone Biosubstitutes
Huang, S., Liang, N., Hu, Y., Zhou, X., & Abidi, N. (2016) · BioMed Research International · doi:10.1155/2016/2389895 · Cited by 97 · see citing works
- Authors
- Zhang, Z., & Jordan, R. B.
- Affiliations
- University of Alberta (CA)
- Venue
- Inorganic Chemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 1996-01-01
- Volume
- 35
- Issue
- 6
- Pages
- 1571-1576
- ISSN
- 0020-1669 (ISSN-L)
- 1520-510X
- OpenAlex
- W2044053136
- Cited by
- 23
- References
- 0
- Citations by year
- 2023: 1 · 2020: 1 · 2019: 1 · 2018: 1 · 2016: 1 · 2015: 1
- FWCI
- 1.49
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Inorganic Chemistry (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Chemistry › Organic Chemistry › Inorganic and Organometallic Chemistry
- Physical Sciences › Chemical Engineering › Filtration and Separation › Chemical and Physical Properties in Aqueous Solutions
- Physical Sciences › Chemistry › Organic Chemistry › Chemical Reaction Mechanisms
- Keywords
- Tiron, iron(III) complexes, dissociation kinetics, acid hydrolysis, hydrolysis rate constants, activation parameters, pH dependence, temperature dependence, stability constants, acidic aqueous solutions, perchloric acid, sodium perchlorate, acetate buffer, iron chelates, redox indicators
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