| abstract |
An object of the present invention is to provide a non-cyanide gold complex having good stability even in a low pH region and applicable as a gold supply source for electroless and electrolytic plating solutions. The present invention provides a gold ion represented by the following formula, which is formed by reacting chloroauric acid or chloroaurate with a hydantoin compound at 40 to 80 ° C. for 30 to 90 minutes in an aqueous solution. Is a gold complex coordinated with a hydantoin compound. Here, sodium chloroaurate or potassium chloroaurate can be applied as the chloroaurate, and 5,5-dimethylhydantoin is preferable as the hydantoin compound. The reaction ratio between chloroauric acid or chloroaurate and the hydantoin compound is preferably 1: 2 to 1:10 in terms of molar ratio. [Chemical 1] [Selection figure] None |