Zyoud Ahed, Jondi Waheed, Mansour Waseem, Majeed Khan M A, Hilal Hikmat S
SSERL, Department of Chemistry, An-Najah National University, Nablus, West Bank Palestine.
King Abdullah Institute for Nanotechnology, King Saud University, P.O. Box 2454, Riyadh, 114 51 Saudi Arabia.
Chem Cent J. 2016 Mar 10;10:12. doi: 10.1186/s13065-016-0153-4. eCollection 2016.
Metalloporphyrin ions, with planar shape, have been known to intercalate horizontally and diagonally between montmorillonite layers. Perpendicular intercalation inside montmorillonite has not been reported earlier. This work aims at achieving perpendicular intercalation inside montmorillonite in natural clays. Possible intercalation inside other forms of natural clay will also be investigated.
Natural clays were purified and characterized. The naked clay powder was then refluxed with tetra(4-pyridyl)porphyrinatomanganese(III) ion (MnTPyP(+)) solution in methanol with continuous stirring for different times. Electronic absorption spectra, atomic absorption spectra, Fourier Transform infrared spectra, scanning electron microscopy and X-ray diffraction were all used in clay characterization and in intercalation study.
The natural clay involved different phases, namely montmorillonite, biotite, kaolinite, illite and traces of quartz. Montmorillonite clay allowed horizontal, diagonal and perpendicular intercalation of the metalloporphyrin ions. Biotite allowed only horizontal intercalation. The mode of intercalation was deduced by monitoring the clay inter-planar distance value change. Intercalation occurred inside both micro- and nano-size clay powders to different extents. The nano-powder (average size ~50 nm) showed uptake values up to 3.8 mg MnTPyP/g solid, whereas the micro-size powder (average size ~316 nm) exhibited lower uptake (2.4 mg MnTPyP/g solid). Non-expandable clay phases did not allow any intercalation. The intercalated MnTPyP(+) ions showed promising future supported catalyst applications.
Depending on their phase, natural clays hosted metalloporphyrin ions. Montmorillonite can allow all three possible intercalation geometries, horizontal, diagonal and for the first time perpendicular. Biotite allows horizontal intercalation only. Non-expandable clays allow no intercalation. Graphical abstractMetalloporphyrin complexes can be intercalated into montmorillonite in horizontal, perpendicular and diagonal geometries.
已知具有平面形状的金属卟啉离子可在蒙脱石层间水平和对角插层。此前尚未报道过在蒙脱石内部垂直插层的情况。这项工作旨在实现天然粘土中金属卟啉在蒙脱石内部的垂直插层。还将研究在其他形式天然粘土中可能的插层情况。
对天然粘土进行提纯和表征。然后将裸粘土粉末与四（4 - 吡啶基）卟啉锰（III）离子（MnTPyP(+)）溶液在甲醇中回流，并持续搅拌不同时间。电子吸收光谱、原子吸收光谱、傅里叶变换红外光谱、扫描电子显微镜和X射线衍射均用于粘土表征和插层研究。
天然粘土包含不同相，即蒙脱石、黑云母、高岭石、伊利石和微量石英。蒙脱石粘土允许金属卟啉离子水平、对角和垂直插层。黑云母仅允许水平插层。通过监测粘土层间距离值的变化推断插层模式。插层在微米级和纳米级粘土粉末中均不同程度地发生。纳米粉末（平均尺寸约50 nm）的吸收值高达3.8 mg MnTPyP/g固体，而微米级粉末（平均尺寸约316 nm）的吸收值较低（2.4 mg MnTPyP/g固体）。非膨胀性粘土相不允许任何插层。插层的MnTPyP(+)离子在未来的负载型催化剂应用中显示出前景。
天然粘土根据其相容纳金属卟啉离子。蒙脱石可允许所有三种可能的插层几何形状，水平、对角以及首次出现的垂直插层。黑云母仅允许水平插层。非膨胀性粘土不允许插层。图形摘要金属卟啉配合物可通过水平、垂直和对角几何形状插入蒙脱石中。
Zotero 插件
