Kiyotoshi Morishige

Simultaneous determinations of metal 5-sulfo-8-quinolinolates by differences in their fluorescence lifetimes

Abstract Fluorescence lifetimes of aluminium, gallium, indium, magnesium, zinc, and cadmium 5-sulfo-8-quinolinolates are reported. A method for the simultaneous determination of two components based on the difference in their fluorescence lifetimes is given. The method is applied to determinations of aluminium in magnesium alloy and of magnesium in aluminium alloy. The procedure is simple and rapid, and gives accurate results.

The fluorescence properties of metal complexes of alkyl derivatives of aromatic schiff bases

Abstract Seventeen alkylated salicylidene-o-aminophenol derivatives were tested as fluorimetric reagents for aluminium, gallium, indium, scandium and beryllium. The aluminium, gallium and beryllium complexes are intensely fluorescent, and the scandium and indium complexes weakly fluorescent. The fluorescence properties of the aluminium, gallium and beryllium complexes were studied and conditions for the fluorimetric determination of these metals were established. 2-Hydroxy-4-methylaniline-N-2-hydroxy-4-methyl-benzylidene is a good reagent because of the reproducibility and sensitivity of the fluorescence. The optimal ranges for determination are 0.005–3 mg Al/25 ml, 0.1–7 μg Ga/25 ml and 0.02–7 μg Be/25 ml. In all cases, 1:1 metal—ligand complexes are formed. Optimal reaction conditions and interference studies are reported.

Simultaneous fluorimetric determination of 8-quinolinol and 5,7-dihalo-8-quinolinols by differences in their fluorescence lifetimes

Abstract A method is described for the simultaneous determination of 8-quinolinol and 5,7-dihalo- 8-quinolinols, without preliminary separation, based on the difference in their fluorescence lifetimes. The method is applied to mixtures of 8-quinolinol (τ, 22.8 ns)and 5,7-dibromo-8-quinolinol (τ, 6.0 ns) or 5,7-dichloro-8-quinolinol (τ, 9.7 ns). The procedure is simple and rapid and is suitable for 10-5—10-7 mol l-1 concentrations.

Analysis of the fluorescence spectra on Kimuraite.

佐賀県東松浦郡肥前町産の木村石[CaY2(CO3)4・6H2O]は紫外線照射により赤紅色の蛍光を発する.この発光は鉱物中に含まれるEu(III), Tb(III), Gd(III)及びDy(III)イオンの輝線スペクトルに起因することを明らかにした.これら発光性希土類金属(III)化合物の蛍光スペクトルの帰属とその分光特性を詳細に検討した結果,木村石の蛍光スペク.トルはそれぞれEu(III):Ex.395(7F6→5Le)/Em.615nm(5D0→7F2);Tb(III):Ex.380(7F6→5D3)/Em.545nm(5D4→7F5);Gd(III):Ex.275(8S7/2→6D3/2)/Em.312nm(6P7/2→8S7/2);Dy(III):Ex.352/Em.575 nm(4F9/2→6H13/2);の4f電子の許容遷移に基づく発光であることを明らかにした.