On January 31, 2020, Jin, Lei; Yang, Jia-Qiang; Yang, Fang-Zu; Wu, De-Yin; Tian, Zhong-Qun published an article.Application In Synthesis of Pyridine-3-sulfonic acid The title of the article was Electrochemistry and coordination behaviors of hypoxanthine-Au (III) ion in the cyanide-free gold electrodeposition. And the article contained the following:
Alkaloid hypoxanthine is a novel complexant for green cyanide-free Au(III) electrodeposition. The electrochem. and coordination behaviors of hypoxanthine-Au(III) ion in the green cyanide-free bath were studied. The electrochem. behavior confirms that hypoxanthine-Au(III) ion is in the irreversible two-step electro-reductions with the 1st controlled by diffusion and the 2nd by diffusion and electrochem. The stability constant of hypoxanthine-Au(III) ion is 4.8 × 1030. DFT calculations further indicate that the optimal coordination structure is N3-Au-N7 with the N-Au average bond energy of 11.03 eV. The bath component of K citrate plays almost no influence, whereas the additive of sulfocompounds shows a significant effect on the electro-reduction of hypoxanthine-Au(III) ion. Based on the cyanide-free Au(III) electrodeposition bath, the obtained Au coating is fine and compact in grains without organic inclusion and in the resistivity of 2.84 × 10-8 Ω m. The experimental process involved the reaction of Pyridine-3-sulfonic acid(cas: 636-73-7).Application In Synthesis of Pyridine-3-sulfonic acid
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