Gottfried J Michael, Flechtner Ken, Kretschmann Andreas, Lukasczyk Thomas, Steinrück Hans-Peter
Universität Erlangen-Nürnberg, Lehrstuhl für Physikalische Chemie II, Egerlandstrasse 3, 91058 Erlangen, Germany.
J Am Chem Soc. 2006 May 3;128(17):5644-5. doi: 10.1021/ja0610333.
We demonstrate that well-defined monolayers of a metal complex on a surface can be prepared by direct vapor deposition of the metal atoms on monolayers of the ligand. In particular, ordered monolayers of adsorbed tetraphenylporphyrin (2H-TPP) on a silver surface were exposed to cobalt vapors, resulting in the complexation of the metal by the porphyrin. The formation of the metal complexes was monitored by means of X-ray photoelectron spectroscopy (XPS), which reveals that this metalation reaction leads to a chemical equivalence of all four nitrogen atoms. The described in situ metalation provides a convenient way to produce adsorbed monolayers of more reactive (e.g., air- or solvent-sensitive) or thermally unstable metalloporphyrins that are difficult to evaporate or even to obtain as pure compounds at room temperature.
我们证明，通过将金属原子直接气相沉积在配体单层上，可以在表面制备定义明确的金属配合物单层。特别是，将银表面上吸附的四苯基卟啉（2H-TPP）有序单层暴露于钴蒸气中，导致卟啉与金属发生络合。通过X射线光电子能谱（XPS）监测金属配合物的形成，结果表明这种金属化反应使所有四个氮原子达到化学等价。所描述的原位金属化提供了一种方便的方法，用于制备更具反应性（如对空气或溶剂敏感）或热不稳定的金属卟啉的吸附单层，这些金属卟啉难以蒸发，甚至在室温下难以作为纯化合物获得。
