| 摘要 |
PROBLEM TO BE SOLVED: To provide a cyanate-free gold complex which has superior stability even in a low pH range, and is applicable for a gold-supplying source in an electroless and electrolytic plating liquid. SOLUTION: The gold complex is formed by reacting chlorauric acid or chloraurate with a hydantoin-based compound in an aqueous solution at 40 to 80°C for 30 to 90 minutes; and has a structure in which the hydantoin-based compound coordinates with a gold ion as shown in the formula; [AuXn]<SP>-</SP>( n is an integer of 1 to 4). The above chloraurate can be sodium chloroaurate or potassium chloroaurate, and the hydantoin compound is preferably 5,5-dimethylhydantoin. A reaction ratio between chlorauric acid or chloraurate and the hydantoin-based compound is preferably 1:2 to 1:10 by a mole fraction. COPYRIGHT: (C)2005,JPO&NCIPI
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