Europium(III) acetate n-hydrate, acetone-d6 (99.9%) and 28% ammonia solution were purchased from Wako Pure Chemical Industries Ltd. Tris(2,4,6-trimethylphenyl)phosphine, (+)-3-(trifluoroacetyl)camphor and (−)-3-(trifluoroacetyl)camphor were purchased from Sigma-Aldrich Co. Tris(2,6-dimethoxyphenyl)phosphine, tris(4-methoxyphenyl)phosphine, and tris(4-methylphenyl)phosphine were purchased from Tokyo Chemical Industry Co., Ltd. All other chemicals and solvents were of reagent grade and were used without further purification.
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