Physical Properties and Metal Ion Specific Scanning Tunneling Microscopy Images of Metal(II) Tetraphenylporphyrins Deposited from Vapor onto Gold (111)
Physical Properties and Metal Ion Specific Scanning Tunneling Microscopy Images of Metal(II) Tetraphenylporphyrins Deposited from Vapor onto Gold (111)
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从蒸气沉积到金上的金属 (II) 四苯基卟啉的物理性质和金属离子特异性扫描隧道显微镜图像 (111)
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
K. W. Hipps
中科院分区：
文献类型：
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作者：
L. Scudiero;A. Barlow;K. W. Hipps
用反射吸收红外光谱（RAIR）和X射线光电子能谱（XPS）研究了四苯基卟啉的Cu（II）、Ni（II）和Co（II）配合物（CuTPP、NiTPP和CoTPP）在金载体上的气相沉积薄膜。此外，还报道了CoTPP和NiTPP在Au（111）表面的亚单层热沉积膜的扫描隧道显微镜（STM）图像。恒电流STM图像显示出显着的偏置依赖性，允许不同的金属四苯基卟啉（MTPPs）的选择性识别。高分辨率STM数据，清楚地显示了个别MTPP分子，并允许NiTPP和CoTPP之间的容易区分，即使在混合单层结构进行研究。在中等偏置值下通过Co（II）dz 2轨道的强隧穿增强与在Co（II）酞菁中观察到的类似，并且特别有趣，因为CoTPP中的钴离子被假定位于Au（111.
Thin films of vapor deposited Cu(II), Ni(II), and Co(II) complexes of tetraphenylporphyrin (CuTPP, NiTPP, and CoTPP) supported on gold are studied by Reflectance Absorption Infrared Spectroscopy (RAIR) and X-ray photoelectron spectroscopy (XPS). In addition, scanning tunneling microscopy (STM) images of ultrathin (submonolayer) thermally deposited films of CoTPP and NiTPP on Au(111) are reported. The constant current STM images show a remarkable bias dependence that allows for the selective identification of different metallotetraphenylporphyrins (MTPPs). High resolution STM data are presented that clearly show the individual MTPP molecules and allow easy differentiation between NiTPP and CoTPP, even when mixed monolayer structures are studied. The strong tunneling enhancement through the Co(II) dz2 orbital at intermediate bias values parallels what is observed in Co(II) phthalocyanines and is especially interesting since the cobalt ion in CoTPP is presumed to be located several Angstroms above the Au(111...