Adsorption of the Meso-Tetra-p-Tolylporphyrin (TTPH2) and Meso-Tetra-Naphthylporphyrin (TNPH2) onto Montmorillonite

J. Hassen, J. Silver
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Abstract

The behavior of two porphyrin compounds, meso-tetra-p-tolylporphyrin (TTPH2) and meso-tetra-naphthylporphyrin (TNPH2) was studied and monitored during their adsorption on cation-exchanged montmorillonite clay (MMT). When these two compounds were reacted with MMT, the visible absorption spectra showed a clear shift of 10 nm higher than that found in the acetic acid solution. This suggests that the two compounds prefer to be more planar on the clay surface and, in the case of TTPH2, in the MMT interlamellar layers. The basal spacing of the MMT was increased by 4.4 Å when the TTPH42+ cations entered the spacers. The metal-exchanged ion in the clay is incorporated into the porphyrin rings when the TTPH2 and TNPH2 molecules react with MMT saturated with the metal ion of an appropriate size to fit in the porphyrin ring, such as Cu(II). The process occurred when executed in a solvent miscible with water that allowed the penetration of the hydrated sphere of the metal ion. Metalloporphyrin complexes are formed as a result of this process. The reactions were monitored using visible absorption spectra, diffuse reflectance spectra, x-ray diffraction, infrared spectra, and electron microscopy.
蒙脱土对中四对卟啉(TTPH2)和中四萘卟啉(TNPH2)的吸附
研究了中四对多聚卟啉(TTPH2)和中四萘基卟啉(TNPH2)两种卟啉化合物在阳离子交换蒙脱土(MMT)上的吸附行为。当这两种化合物与MMT反应时,其可见吸收光谱明显比在醋酸溶液中高出10 nm。这表明这两种化合物更倾向于在粘土表面呈平面状,在TTPH2的情况下,更倾向于在MMT层间层。当TTPH42+阳离子进入隔离剂后,MMT的基底间距增加了4.4 Å。当TTPH2和TNPH2分子与MMT反应时,粘土中的金属交换离子被纳入卟啉环,MMT饱和了适当大小的金属离子,如Cu(II)。该过程发生在与水相混的溶剂中,这种溶剂允许金属离子的水合球体渗透。这一过程形成了金属卟啉复合物。利用可见吸收光谱、漫反射光谱、x射线衍射、红外光谱和电子显微镜对反应进行了监测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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