1. Hungry Porphyrins: Protonation and Self‐Metalation of Tetraphenylporphyrin on TiO 2 (110) ‐ 1 × 1
- Author
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Martin Drost, Qian Xu, Ole Lytken, Cici Wang, Tao Wang, Hubertus Marbach, Haibin Pan, Huanxin Ju, Junfa Zhu, Hans-Peter Steinrück, Matthias Franke, Julia Köbl, Fan Tu, and Daniel Wechsler
- Subjects
Metalation ,Protonation ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,Porphyrin ,0104 chemical sciences ,law.invention ,chemistry.chemical_compound ,Adsorption ,chemistry ,X-ray photoelectron spectroscopy ,law ,Tetraphenylporphyrin ,Monolayer ,Scanning tunneling microscope ,0210 nano-technology - Abstract
We have studied the adsorption and self-metalation of tetraphenylporphyrin (2HTPP) on TiO2(110) - 1 × 1 with X-ray Photoelectron Spectroscopy (XPS) and Scanning Tunneling Microscopy (STM). Upon adsorption at room temperature the first monolayer of 2HTPP is protonated by protons from the surface, forming porphyrin diacid (4HTPP2+). In STM, single molecules with low mobility and no long-range order were observed. As the surface is heated to 400 K, any unprotonated 2HTPP molecules in the second layer metalate, forming titanyl tetraphenylporphyrin (TiOTPP), but the protonated molecules in the first layer remain. As the surface is heated further to 550 K even the protonated 4HTPP2+ molecules metalate and only TiOTPP remain on the surface. more...
- Published
- 2016
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