Critical evaluation of stability constants of phosphonic acids (IUPAC Technical Report)

Popov, Konstantin; Rönkkömäki, Hannu; Lajunen, Lauri H. J.

doi:10.1351/pac200173101641

Cited by 244 publications

(189 citation statements)

References 25 publications

Supporting

Mentioning

165

Contrasting

Unclassified

Order By: Relevance

“…Etidronic acid is currently one of the most popular chelating agents and is widely used in various applications, such as in medicines, commercial washing agents, and inhibitors for corrosion protection. Etidronic acid is a tetraacid that features four acidic hydroxyl groups with the following acid dissociation constants, pKa [50,51] 1 and pKa 2 values as indicated above, it is expected that etidronic acid has the potential to behave as a suitable electrolyte for fabricating anodic porous alumina. We found that etidronic acid anodizing under appropriate electrochemical conditions provided highly ordered anodic porous alumina with a large-scale cell diameter, approximately 530-670 nm.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Self-Ordered Porous Alumina via Etidronic Acid Anodizing and Structural Color Generation from Submicrometer-Scale Dimple Array

Kikuchi

Nishinaga

Natsui

et al. 2015

Electrochimica Acta

106

View full text Add to dashboard Cite

Highly ordered anodic porous alumina with a large-scale cell diameter was successfully fabricated via anodizing in a new electrolyte, etidronic acid (1-hydroxyethane-1,1-diphosphonic acid). High-purity aluminum specimens were anodized in a 0.3 M etidronic acid solution under constant current density and voltage conditions. Etidronic acid anodizing at 210 to 270 V at the appropriate temperature caused the anodic porous alumina to exhibit self-ordering behavior, and periodic nanostructures measuring 530 to 670 nm in cell diameter were fabricated on the aluminum substrate. The self-ordering voltage and the corresponding cell diameter could be increased without burning by systematically increasing the stepwise voltage. Two-step etidronic acid anodizing without nanoimprinting can easily yield the formation of highly ordered anodic porous alumina with a large-scale cell diameter. A submicrometer-scale dimple array fabricated via etidronic acid anodizing and subsequent selective oxide dissolution gave rise to bright structural color with a rainbow distribution.Keywords: Anodizing; Etidronic Acid; Anodic Porous Alumina; Self-Ordering; Structural Color 3 IntroductionAnodizing aluminum and its alloys in acidic electrolyte solutions results in the formation of porous anodic oxide films (anodic porous alumina) with numerous nanometer-scale pores [1][2][3]. Most importantly, anodic porous alumina is self-ordered when anodized under the appropriate electrochemical conditions in a given acidic solution, and consequently, high-aspect-ratio anodic porous alumina with an ideal cell arrangement can be easily obtained [4][5][6][7][8][9]. In the self-ordering anodizing, it is well known that the cell diameter of the anodic porous alumina, D, is strongly related to the self-ordering voltage, U s : a) D = 50-60 nm at U s = 19-25 V for sulfuric acid [10,11], b) 100 nm at 40 V for oxalic acid [4,11,12] [35][36], and magnetic nanomaterials [37].Because the cell diameter of self-ordered porous alumina fabricated by typical anodizing in aqueous solutions is limited to approximately 500 nm at 200 V [5,18], larger cell diameters that correspond to visible-light wavelengths ranging between 500 nm and 800 nm are required to expand the applicability of porous alumina in the field of optics. Malic acid anodizing provides a relatively high anodizing voltage and, consequently, a larger cell diameter, D = 300-800 nm at 200-350 V [38,39]. However, to date, ordered anodic porous alumina has not been obtained by malic acid anodizing. As an alternative electrolyte for high-voltage anodizing, citric acid has also been investigated by several research groups [39][40][41][42]. Citric acid anodizing operates over an anodizing voltage range of approximately 260-540 V. However, non-uniform black oxides are easily formed by a phenomenon called "burning" during citric acid anodizing because of localized breakdown under high electric fields, and it is difficult to obtain high-aspect-ratio ordered porous alumina. Therefore, ethylene glycol mixture soluti...

show abstract

Section: Introductionmentioning

confidence: 99%

Fabrication of Self-Ordered Porous Alumina via Etidronic Acid Anodizing and Structural Color Generation from Submicrometer-Scale Dimple Array

Kikuchi

Nishinaga

Natsui

et al. 2015

Electrochimica Acta

106

View full text Add to dashboard Cite

show abstract

“…The complex structure proposed in the literature (see Figure 6) for the complex with only two nitrogen atoms and one phosphonate group chelated to Mn(II) forming a stable cyclic structure is highly improbable, as it would imply a q value too high to be compatible with the observed r 1 [31]. There is evidence that aminophosphonate ligands with two or more phosphonate groups have lower coordination tendencies than expected due to the mutual repulsion between adjacent binegative phosphonate groups [32,33]. This is reflected in the stability constants of the MnL 1 and MnL 2 , which are smaller than those of the corresponding carboxylate analogues EDTA and HDTA [31].…”

Section: Proton Relaxivitiesmentioning

confidence: 92%

Hydroxy double salts intercalated with Mn(II) complexes as potential contrast agents

Jin

Spillane

et al. 2016

Solid State Sciences

View full text Add to dashboard Cite

show abstract

“…It has been shown that saline solutions tend to promote calcite dissolution (salt effect), thus leading to an increased release of Ca 2+ . 64 65 while the solubility of phosphonate complexes with alkaline-earth metals increases in the order Ca < Ba < Sr < Mg. 45 Thus, in the presence of magnesium no precipitate will form and phosphonate molecules will adsorb (physisorption) onto calcite surfaces.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Template-Assisted Crystallization of Sulfates onto Calcite: Implications for the Prevention of Salt Damage

Ruíz-Agudo

Putnis

Pel

et al. 2012

Crystal Growth & Design

View full text Add to dashboard Cite

In situ X-ray diffraction (XRD) and environmental scanning electron microscope (ESEM) crystallization experiments show oriented growth of magnesium sulfate crystals on a diethylenetriamine-penta-methylene phosphonic acid (DTPMP) template adsorbed onto Iceland spar (calcite, CaCO3) cleavage surfaces. Epsomite (MgSO4·7H2O) and hexahydrite (MgSO4·6H2O) crystallize (depending on the ambient conditions) in the presence of DTPMP with (010)epsomite//(101̅4)calcite and (1̅11)hexahydrite//(101̅4)calcite, whereas in the absence of DTPMP they show no preferred orientation. On the other hand, sodium sulfate (mirabilite, Na2SO4·10H2O) nucleates onto a Ca-DTPMP precipitate with (001)mirabilite//(101̅4)calcite. In contrast, different sodium sulfate phases crystallize and grow with no preferred crystallographic orientation in the absence of an organic additive. These results allow us to propose a model for the interaction calcite-DTPMP-Na and Mg sulfates based on the template-assisted nucleation and oriented heterogeneous crystallization, mediated by a Ca-precipitate, of inorganic salts on calcitic substrates. This effect results in a (measured) reduction in the critical supersaturation reached by these salts when crystallizing in confined geometries, i.e., a pore, thus resulting in a reduction in crystallization pressure and damage to porous substrates such as building stones. These results have implications in fields where in-pore crystallization of salts results in damage or plugging of the porous network, e.g., cultural heritage conservation and in the oil industry, where phosphonates are used as crystallization inhibitors.

show abstract

Critical evaluation of stability constants of phosphonic acids (IUPAC Technical Report)

Abstract: Republication or reproduction of this report or its storage and/or dissemination by electronic means isAbstract: Available experimental data on stability constants of proton and metal complexes for 10 phosphonic acids [methylphosphonic acid, 1-hydroxyethane-

Cited by 244 publications

References 25 publications

Fabrication of Self-Ordered Porous Alumina via Etidronic Acid Anodizing and Structural Color Generation from Submicrometer-Scale Dimple Array

Fabrication of Self-Ordered Porous Alumina via Etidronic Acid Anodizing and Structural Color Generation from Submicrometer-Scale Dimple Array

Hydroxy double salts intercalated with Mn(II) complexes as potential contrast agents

Template-Assisted Crystallization of Sulfates onto Calcite: Implications for the Prevention of Salt Damage

Contact Info

Product

Resources

About