Structural study of porphyrin isomers on metal substrates by using STM T. Terui a,*, T. Sekiguchib, Y. Wakayamab, T. Kamikadoa, S. Mashikoa "Nanotechnology Group, Communications Research Laboratory, Kansai Advanced Research Center, 588-2, Iwaoka, Nishi, Kobe 65 1-2492, Japan b National Institute for Materials Science, 226S- 1, Shimoshtdami, Moriyama, Nagoya 464 -0003,. Japan Available online 8 August 2004 |
| Abstract To further improve device technology, we need to observe and evaluate the structure and array of molecules on substrates. Here, we report the results of observing the porphyrin molecule isomers, tertiary-butyl-methoxy-phenyl-porphyrin (TBMPP) and tertiary-butyl-phenyl-vinyl- phenyl-porphyrin (TBPVPP), using a scanning tunneling microscope (STM). STM images ofTBMPP showed differences in the distortion of the porphyrin ring. That apparently depended on the position of the methoxy group. In the case of the TBPVPP, the images showed cis- and trans-molecule structures that depended on the position of the vinyl group. We were able to observe molecular structures and identity isomers that are difficult to identify using chemical techniques. © 2004 Elsevier B.V. All rights reserved. PACS61.16.C |