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Then, a solution prepared by dissolving 285.3 mg of Ni(ClO4)2.6H2O in 50 ml of water, was added under a nitrogen atmosphere to a solution prepared by dissolving 100 mg of 5-(2'-methyl-4'-diethylaminophenylimino)quinoline-8-one obtained above in 50 ml of 99% ethanol, and the mixture was stirred at room temperature for about 30 minutes. Formed precipitates were subjected to suction filtration, washed with water and dried to obtain a metal-containing indoaniline compound having the formula: ##STR9##

1. customThen, a solution prepared
2. additionwas added under a nitrogen atmosphere to a solution
3. customprepared
4. customFormed
5. customprecipitates
6. filtrationwere subjected to suction filtration
7. washwashed with water
8. customdried