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首页> 外文期刊>The Journal of Chemical Physics >Iron phthalocyanine on Cu(111): Coverage-dependent assembly and symmetry breaking, temperature-induced homocoupling, and modification of the adsorbate-surface interaction by annealing
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Iron phthalocyanine on Cu(111): Coverage-dependent assembly and symmetry breaking, temperature-induced homocoupling, and modification of the adsorbate-surface interaction by annealing

机译：Cu（111）上的酞菁铁：依赖于覆盖率的组装和对称性破坏，温度诱导的均偶联以及通过退火修饰吸附物-表面相互作用

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We have examined the geometric and electronic structures of iron phthalocyanine assemblies on a Cu(111) surface at different sub-to mono-layer coverages and the changes induced by thermal annealing at temperatures between 250 and 320. degrees C by scanning tunneling microscopy, x-ray photoelectron spectroscopy, and x-ray absorption spectroscopy. The symmetry breaking observed in scanning tunneling microscopy images is found to be coverage dependent and to persist upon annealing. Further, we find that annealing to temperatures between 300 and 320. degrees C leads to both desorption of iron phthalocyanine molecules from the surface and their agglomeration. We see clear evidence of temperature-induced homocoupling reactions of the iron phthalocyanine molecules following dehydrogenation of their isoindole rings, similar to what has been observed for related tetrapyrroles on transition metal surfaces. Finally, spectroscopy indicates a modified substrate-adsorbate interaction upon annealing with a shortened bond distance. This finding could potentially explain a changed reactivity of Cu-supported iron phthalocyanine in comparison to that of the pristine compound. (C) 2016 Author(s).
机译：我们已经通过扫描隧道显微镜x检验了Cu（111）表面上不同亚至单层覆盖率的铁酞菁组件的几何结构和电子结构，以及在250至320°C的温度下由热退火引起的变化。射线光电子能谱和X射线吸收光谱。发现在扫描隧道显微镜图像中观察到的对称性破坏取决于覆盖率并且在退火后持续存在。此外，我们发现退火至300到320摄氏度之间的温度会导致铁酞菁分子从表面脱附及其附聚。我们看到明显的证据表明，铁酞菁分子的异吲哚环脱氢后，温度诱导了均偶联反应，类似于过渡金属表面上相关四吡咯的观察结果。最后，光谱学表明退火后具有缩短的键距的修饰的底物-吸附物相互作用。这一发现可能潜在地解释了与原始化合物相比，铜负载的酞菁铁的反应性发生了变化。 （C）2016作者。

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