448245-52-1Relevant articles and documents
Electrodeposition of zinc coatings from the solutions of zinc oxide in imidazolium chloride/urea mixtures
Zheng, Yong,Dong, Kun,Wang, Qian,Zhang, Suo Jiang,Zhang, Qin Qin,Lu, Xing Mei
, p. 1587 - 1597 (2012)
To solve the inherent disadvantages in conventional processes for electrodeposition of zinc, it's necessary to develop more high-efficiency and environmentally friendly electrolytes. In this work, it was found that the dissolution of ZnO was remarkably enhanced in some imidazolium chloride by the addition of urea, and the solubility of ZnO in 1:1 [Amim]Cl/urea mixture was as high as 8.35 wt% at 373.2 K. Electrochemical measurements showed that zinc could be readily electrodeposited from the solutions of ZnO. Bright, dense and well adherent zinc coatings with good purity were obtained from 0.6 M solution of ZnO in 1:1 [Amim]Cl/urea at 323.2?343.2 K. It's expected that the solutions of ZnO in imidazolium chloride/urea mixtures have the potential to replace the traditional electrolytes, especially toxic zinc chloride-based ones for zinc electroplating, as well as preparation of zinc materials. Science China Press and Springer-Verlag Berlin Heidelberg 2012.
A Robust Fungal Allomelanin Mimic: An Antioxidant and Potent π-Electron Donor with Free-Radical Properties that can be Tuned by Ionic Liquids
Manini, Paola,Lino, Valeria,Franchi, Paola,Gentile, Gennaro,Sibillano, Teresa,Giannini, Cinzia,Picardi, Emanuela,Napolitano, Alessandra,Valgimigli, Luca,Chiappe, Cinzia,d'Ischia, Marco
, p. 1331 - 1337 (2019/06/24)
Developing effective strategies to increase the chemical stability and to fine-tune the physico-chemical properties of melanin biopolymers by rational control of π-electron conjugation is an important goal in materials science for biomedical and technological applications. Herein we report that poly-1,8-dihydroxynaphthalene (pDHN), a non-nitrogenous, catechol-free fungal melanin mimic, displays a high degree of structural integrity (from MALDI-MS and CP/MAS 13C NMR analysis), a strong radical scavenging capacity (DPPH and FRAP assays), and an unusually intense EPR signal (g=2.0030). Morphological and spectral characterization of pDHN, along with deassembly experiments in ionic liquids, indicated amorphous aggregates of small globular structures with an estimated stacking distance of 3.9 ? and broadband absorption throughout the visible range. These results indicate that DHN-based melanins exhibit a high structural integrity and enhanced antioxidant and free-radical properties of potentially greater biomedical and technological relevance than for typical indole-based eumelanins.
The effect of varying the anion of an ionic liquid on the solvent effects on a nucleophilic aromatic substitution reaction
Hawker, Rebecca R.,Haines, Ronald S.,Harper, Jason B.
supporting information, p. 3453 - 3463 (2018/05/23)
A variety of ionic liquids, each containing the same cation but a different anion, were examined as solvents for a nucleophilic aromatic substitution reaction. Varying the proportion of ionic liquid was found to increase the rate constant as the mole fraction of ionic liquid increased demonstrating that the reaction outcome could be controlled through varying the ionic liquid. The solvent effects were correlated with the hydrogen bond accepting ability (β) of the ionic liquid anion allowing for qualitative prediction of the effect of changing this component of the solute. To determine the microscopic origins of the solvent effects, activation parameters were determined through temperature-dependent kinetic analyses and shown to be consistent with previous studies. With the knowledge of the microscopic interactions in solution, an ionic liquid was rationally chosen to maximise rate enhancement demonstrating that an ionic solvent can be selected to control reaction outcome for this reaction type.
