Jackman Mark J, Syres Karen L, Cant David J H, Hardman Samantha J O, Thomas Andrew G
School of Physics and Astronomy and Photon Science Institute, Alan Turing Building, The University of Manchester , Oxford Road, Manchester M13 9PL, UK.
Langmuir. 2014 Jul 29;30(29):8761-9. doi: 10.1021/la501357b. Epub 2014 Jul 17.
Synchrotron radiation photoelectron spectroscopy and near-edge X-ray absorption fine structure (NEXAFS) techniques have been used to study the adsorption of dopamine on a rutile TiO2 (110) single crystal. Photoemission results suggest that dopamine bonds through the oxygen molecules in a bidentate fashion. From the data, it is ambiguous whether the oxygens bond to the same 5-fold coordinated surface titanium atom or bridges across two, although based on the bonding of pyrocatechol on rutile TiO2 (110), it is likely that the dopamine bridges two titanium atoms. Using the searchlight effect, the carbon K-edge near-edge X-ray absorption fine structure NEXAFS spectra recorded for dopamine on rutile TiO2 (110) show the phenyl ring to be oriented at 78° ± 5° from the surface and twisted 11 ± 10° relative to the (001) direction.
同步辐射光电子能谱和近边X射线吸收精细结构（NEXAFS）技术已被用于研究多巴胺在金红石型TiO2（110）单晶上的吸附。光发射结果表明，多巴胺通过氧分子以双齿方式键合。从数据来看，氧原子是与同一个五重配位的表面钛原子键合还是横跨两个钛原子并不明确，不过基于邻苯二酚在金红石型TiO2（110）上的键合情况，多巴胺很可能横跨两个钛原子。利用探照灯效应，记录的金红石型TiO2（110）上多巴胺的碳K边近边X射线吸收精细结构NEXAFS光谱显示，苯环相对于表面的取向为78°±5°，相对于（001）方向扭转了11±10°。
