Noncovalent interactions in metal complexes. VIII. Syntheses, properties, and stereoselectivities of lanthanoid complexes with 1-l-menthyloxy-3-benzoylacetone.
スポンサーリンク
概要
- 論文の詳細を見る
Lanthanoid complexes with 1-<I>l</I>-menthyloxy-3-benzoylacetone, [Ln(<I>l</I>-moba)<SUB>3</SUB>(H<SUB>2</SUB>O)<I><SUB>n</SUB></I>] (Ln=La, Pr, Nd, Eu, Dy, Ho, Tm; <I>n</I>=0, 1, or 2), have been synthesized and characterized by elemental analyses, molecular weight determinations, and electronic, circular dichroism, and luminescence spectra. The molecular weight determinations suggest that the complexes are in a monomer-dimer equilibrium in nondonating solvents while they are monomeric in donating solvents. The complexes exhibit fairly intense circular dichroisms at the f-f band region, demonstrating the stereoselective formation of an enantiomer. The stereoselectivities have been discussed in terms of the intramolecular interligand CH/π-interaction operating between the phenyl and the menthyl groups of the ligands. [Eu(<I>l</I>-moba)<SUB>3</SUB>(H<SUB>2</SUB>O)] shows luminescence at the <SUP>5</SUP>D<SUB>0</SUB>→<SUP>7</SUP>F<SUB>1</SUB> and <SUP>5</SUP>D<SUB>0</SUB>→<SUP>7</SUP>F<SUB>2</SUB> transitions in benzene. Based on the concentration dependence of the luminescence, it is demonstrated that dimerization facilitates nonradiative relaxation and greatly reduces the quantum efficiency of luminescence.
- 公益社団法人 日本化学会の論文
著者
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Okawa Hisashi
Department Of Chemistry Faculty Of Science Kyushu University
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Nakamura Michio
Department Of Host-defense Biochemistry Institute Of Tropical Medicine Nagasaki University
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Kida Sigeo
Department of Chemistry Wakayama University
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Misumi Seizo
Department of Industrial Chemistry, Faculty of Engineering, Kyushu Sangyo University
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