Theoretical and experimental studies of the influence of gold ions and DMH on cyanide-free gold electrodeposition

Abstract

Au3+ is the appropriate gold source for the DMH-based gold electroplating electrolyte to get greater cathodic polarization.

Experimental and DFT study of the effect of mercaptosuccinic acid on cyanide-free immersion gold deposition

“…In ref. 27, coordination between N atom and Au atom was calculated and the result is consistent with ours that 3N coordinates with Au + . Both O and P atoms in HEDP contribute to the composition, but neither of them has a strong electron donating ability.…”

“…18 In the process of geometric optimization, the B3LYP 19 functional was chosen as the theoretical method. The LANL2DZ ECP 20,21 basis set was used for gold atoms, and the 6-311++G** [22][23][24][25][26][27] basis set was used for other atoms. Water in the IEFPCM theoretical model was selected as solvent.…”

Novel Amino-pillar[5]arene as a Fluorescent Probe for Highly Selective Detection of Au3+ Ions

“…Au 3+ ions, a notable heavy metal, have received great attention in chemistry and biology during recent decades and have been widely used in gold plating, 1 environmental studies, 2 anticancer agents, 3 nanomaterials, efficient catalysts, biological sensors, and drug/gene delivery systems based on their unique chemical properties and high biocompatibility. 4−7 In addition, these ions have also been developed for application in the jewelry industry.…”

Electroless deposition of Ni–P/Au coating on Cu substrate with improved corrosion resistance from Au(iii)–DMH based cyanide-free plating bath using hypophosphite as a reducing agent

“…In aqueous solution, Au 3+ is more stable than Au + , so it has been favored by more researchers in recent years. 5,5-Dimethylhydantoin (DMH), [21][22][23][24] theophylline, 25 and hypoxanthine 26,27 were cyanide-free complexing agents used in electroplating baths with Au 3+ as the main salt. Among the three new complexing agents, DMH has been studied most.…”

“…Aer the N atom between its two C]O bonds ionizes H + , it can form DMH À ion and then coordinate with Au 3+ to form a four-coordinate complex. 22,28,29 The stability constant of Au(DMH) 4 À which is square planar in geometry is 10 21 . 1 The cyanide-free gold plating system with DMH as a complex can electrodeposit bright gold layer.…”