期刊
ELECTROCHIMICA ACTA
卷 304, 期 -, 页码 168-174出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.02.118
关键词
Theophylline (THP); Coordination behavior; DFT; Electrode behavior; Cyanide-free gold electrodeposition
资金
- National Natural Science Foundation of China [21703183, 21373172]
- National Natural Science Foundation Innovation Group of China [21621091]
Coordination behavior between theophylline (THP) molecule and Au(III) ion as well as electrochemical reduction of THP-Au(III) complexing ion were studied in detail. UV-vis absorption spectroscopy clarifies that Au(III) is coordinated with THP in a 1:2 M ratio. Raman spectroscopy indicates that it is N in THP chemically bonding to Au(III), and density functional theory (DFT) together with time-dependent density functional theory (TD-DFT) further reveal that the specific N atom is N9 in the imidazole ring (N7H form). Based on the invented formula of cyanide-free gold electroplating with THP as a complexant, the electrode behavior of THP-Au(III) ion on the gold electrode was studied. The results show that the stability constant K-f of THP-Au(III) ion is 2.7 x 10(35), and the reduction of THP-Au(III) ion is in irreversible with diffusion control. (C) 2019 Elsevier Ltd. All rights reserved.
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