Studies on Amidinourea Resins with Poly(methyl methacrylate) Chain

Tanaka, Satomi; Hatanaka, Masashi; Shimizu, Takeshi; Shiba, Ryuichi

doi:10.1295/koron.66.43

Cited by 2 publications

(5 citation statements)

References 4 publications

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“…As introduced previously, the adsorption efficiencies of ion‐exchange resins are highly dependent on the hydrophilic and hydrophobic properties of substituents around the ligands . Moreover, the adsorption efficiencies are also affected by the polarization of the polymer chain . Because these aspects do not come from the electronic states of the ligand itself, it is reasonable that there exist boundary films of the ion concentrations at the surface of the resin bead.…”

Section: Effects Of the Boundary Filmmentioning

confidence: 98%

“…However, when the pH is quite high, a neutralization reaction between the acid and base occurs, 15 or the electronic states of the ligands sometimes change into other types. 16 Then, the approximation cannot be applied. Although 2m and 2m 0 can be rewritten as m and m 0 , we left them unchanged for the deduction of the expressions.…”

Section: Adsorption and Ion Exchange Of Two Componentsmentioning

confidence: 99%

“…13 Moreover, the adsorption efficiencies are also affected by the polarization of the polymer chain. 16 Because these aspects do not come from the electronic states of the ligand itself, it is reasonable that there exist boundary films of the ion concentrations at the surface of the resin bead. Once the concentration at the surface is determined, the diffusion constant D M is reflected to the rate of reaction through the surface concentration.…”

Section: Classical Theory Of Film Diffusionmentioning

confidence: 99%

“…Eliminating M(d M ,t) and H(d H ,t) by eqs. (16) and (17), we obtain a quadratic equation of N M , and the total rate of reaction is obtained as a function of the bulk concentrations M(0,t) and H(0,t):…”

Section: Self-consistent Surface Concentrationmentioning

confidence: 99%

“…However, when the pH is quite high, a neutralization reaction between the acid and base occurs, or the electronic states of the ligands sometimes change into other types . Then, the approximation cannot be applied.…”

Section: Theoreticalmentioning

confidence: 99%

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Ion‐exchange kinetics based on film theory

Hatanaka

Hoshi

2013

J of Applied Polymer Sci

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The ion‐exchange kinetics in polymer complexes was theoretically formulated. The regeneration of metal species from an ion‐exchange or chelate resin was described as a competitive reaction between metal ions and protons. We considered the ion‐exchange terms and the Langmuir terms to describe the rate of reaction, and film diffusion was also taken into account to describe the profile of the kinetics. In contrast to early methods, the surface concentrations were determined so that the rates of the chemical reactions and diffusion were self‐consistent. Although in the initial stage ion exchange was controlled by diffusion, in the last stage ion exchange was controlled by chemical reactions, particularly under excess acid. The kinetics were supported by experimental data for an iminodiacetic acid chelate resin and amidinourea resins. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39358.

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Section: Effects Of the Boundary Filmmentioning

confidence: 98%

Section: Adsorption and Ion Exchange Of Two Componentsmentioning

confidence: 99%

Section: Classical Theory Of Film Diffusionmentioning

confidence: 99%

Section: Self-consistent Surface Concentrationmentioning

confidence: 99%

Section: Theoreticalmentioning

confidence: 99%

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Ion‐exchange kinetics based on film theory

Hatanaka

Hoshi

2013

J of Applied Polymer Sci

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Anionic Amidinourea–Metal(II) Tautomers: MN2O2 or MN4?

Hatanaka

2014

Bulletin of the Chemical Society of Japan

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Structures of amidinourea–metal complexes have been obscured by subtle tautomerism and crystal waters. To clarify the most stable form of the tautomers, bis(amidinourea)copper(II) anhydride and the alkyl derivatives were synthesized under basic conditions, and the stability of the CuN2O2 chromophore was suggested. From substituent effects of chelations, UV–vis spectra, IR/Raman spectra, and DFT calculations, it was suggested that the bis(amidinourea)copper(II) has a CuN2O2 chromophore, not CuN4 chromophore. The mutual exclusion rule of IR/Raman spectra supported the trans-CuN2O2 chromophore. Systematic calculations on bis(amidinourea)–Cu(II), –Ni(II), –Pd(II), –Zn(II), and –Cd(II) chelates revealed that the robust stability of CuN2O2 chromophores originates from quasi aromaticity in the six-membered chelate rings. cis- or trans-CuN4 stability reported in the early references is suspicious.

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Studies on Amidinourea Resins with Poly(methyl methacrylate) Chain

Cited by 2 publications

References 4 publications

Ion‐exchange kinetics based on film theory

Ion‐exchange kinetics based on film theory

Anionic Amidinourea–Metal(II) Tautomers: MN2O2 or MN4?

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