Total internal reflection resonance Raman microspectroscopy for the liquid/liquid interface. Ion-association adsorption of cationic Mn(III) porphine

被引：33

作者：

Fujiwara, K ^{[1
]}

Watarai, H ^{[1
]}

机构：

[1] Osaka Univ, Grad Sch Sci, Dept Chem, Toyonaka, Osaka 5600043, Japan

来源：

LANGMUIR | 2003年 / 19卷 / 07期

关键词：

D O I：

10.1021/la026119y

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The interfacial adsorption of meso-tetrakis(N-methylpyridyl)porphyrinatomanganese(III) (Mn(TMPyP)(5+)) with dihexadecyl phosphate (DHP) at the toluene/water interface was studied by means of a total internal reflection resonance Raman microspectroscopy. The intensity of interfacial Raman spectra of Mn(TMPyP)5+ was significantly enhanced by the addition of DHP. Since the Raman spectra were not shifted by the presence of DHP, the enhancement was ascribed to the electrostatic Stern layer adsorption of Mn(TMPyP)5+ to the negatively charged interface by the adsorption of DHP. The interfacial adsorption of Mn(TMPyP)5+ was confirmed by the measurement of interfacial tension lowering under the absence and the presence of DHP. Polarized Raman spectra suggested that the average tilt angle of the porphyrin plane of the Mn(TMPyP)5+ molecule to the interface normal was 65degrees at the interface adsorbed by DHP. The interfacial ion association adsorption of Mn(TMPyP)(5+) was analyzed by the Langmuir isotherm, and the adsorption parameters were obtained.

引用

页码：2658 / 2664

页数：7

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