反应详情

A sodium cinnamate aqueous solution was obtained by dissolving 1.698 g of sodium hydroxide in 300 ml of purified water and then thoroughly dissolving 6.289 g of cinnamic acid (conjugate number=4), while under stirring, in the resultant aqueous solution. This aqueous solution was adjusted to pH 11.0 with a 0.1 N. sodium hydroxide aqueous solution. Then, a lanthanum chloride aqueous solution obtained by thoroughly dissolving 5.0 g of lanthanum chloride (LaCl3.6H2O; purity 99.9%) in 100 ml of purified water was added, while under stirring into the aforementioned sodium cinnamate aqueous solution at room temperature. Consequently, a white lanthanum cinnamate, [(C6H5CH=CHCOO)3La], was obtained in the form of a precipitate. The reaction solution was adjusted to pH 5.0 with 0.1 N hydrochloric acid and thoroughly stirred. The lanthanum cinnamate thus obtained was separated by means of a glass filter, washed thoroughly with 500 ml of purified water and thereafter dried in vacuo at 80° to 100° C. for 20 to 24 hours.

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