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Scanning Tunneling Microscopy with Chemically Modified Tips: Discrimination of Porphyrin Centers Based on Metal Coordination and Hydrogen Bond Interactions
STM gold tips chemically modified with 4-mercaptopyridine (4MP) were found capable of discriminating zinc(II) 5,15-bis(4-octadecyloxyphenyl)porphyrin (Por-Zn) from its metal-free porphyrin (Por-2H) and nickel(II) complexes (Por-Ni) in the mixed monolayers of these compounds, spontaneously formed at...
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Published in: | Analytical chemistry (Washington) 2001-03, Vol.73 (5), p.878-883 |
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creator | Ohshiro, Takahito Ito, Takashi Bühlmann, Philippe Umezawa, Yoshio |
description | STM gold tips chemically modified with 4-mercaptopyridine (4MP) were found capable of discriminating zinc(II) 5,15-bis(4-octadecyloxyphenyl)porphyrin (Por-Zn) from its metal-free porphyrin (Por-2H) and nickel(II) complexes (Por-Ni) in the mixed monolayers of these compounds, spontaneously formed at the solution/graphite interface. The porphyrin centers in STM images observed with 4MP-modified tips exhibited bright spots, while those measured with unmodified tips exhibited the porphyrin centers as dark depressions. The centers of Por-Zn were brighter than those of Por-2H and Por-Ni, thereby allowing the discrimination of Por-Zn from Por-2H or Por-Ni in mixed monolayers. The changes in the contrasts of porphyrin centers of Por-2H and Por-Zn/Por-Ni were explained by facilitated electron tunneling due to hydrogen bond and metal coordination interactions, respectively, between porphyrin centers and the pyridyl group of 4MP on the tip. |
doi_str_mv | 10.1021/ac001056e |
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The porphyrin centers in STM images observed with 4MP-modified tips exhibited bright spots, while those measured with unmodified tips exhibited the porphyrin centers as dark depressions. The centers of Por-Zn were brighter than those of Por-2H and Por-Ni, thereby allowing the discrimination of Por-Zn from Por-2H or Por-Ni in mixed monolayers. 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Ito, Takashi ; Bühlmann, Philippe ; Umezawa, Yoshio</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a404t-930167ab1afb84adf85c55e3890b403e23d1a1663f0285c17b8fa63d69d1f8353</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2001</creationdate><topic>Chemistry</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>Hydrogen</topic><topic>Hydrogen Bonding</topic><topic>Metals</topic><topic>Metals - chemistry</topic><topic>Microscopy, Scanning Tunneling - methods</topic><topic>Porphyrins - chemistry</topic><topic>Scientific imaging</topic><topic>Solid-liquid interface</topic><topic>Surface physical chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ohshiro, Takahito</creatorcontrib><creatorcontrib>Ito, Takashi</creatorcontrib><creatorcontrib>Bühlmann, Philippe</creatorcontrib><creatorcontrib>Umezawa, Yoshio</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Aluminium Industry Abstracts</collection><collection>Biotechnology Research Abstracts</collection><collection>Ceramic Abstracts</collection><collection>Computer and Information Systems Abstracts</collection><collection>Corrosion Abstracts</collection><collection>Electronics & Communications Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Materials Business File</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Nucleic Acids Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Toxicology Abstracts</collection><collection>Virology and AIDS Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Copper Technical Reference Library</collection><collection>AIDS and Cancer Research Abstracts</collection><collection>Materials Research Database</collection><collection>ProQuest Computer Science Collection</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Computer and Information Systems Abstracts Academic</collection><collection>Computer and Information Systems Abstracts Professional</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>MEDLINE - Academic</collection><jtitle>Analytical chemistry (Washington)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ohshiro, Takahito</au><au>Ito, Takashi</au><au>Bühlmann, Philippe</au><au>Umezawa, Yoshio</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Scanning Tunneling Microscopy with Chemically Modified Tips: Discrimination of Porphyrin Centers Based on Metal Coordination and Hydrogen Bond Interactions</atitle><jtitle>Analytical chemistry (Washington)</jtitle><addtitle>Anal. Chem</addtitle><date>2001-03-01</date><risdate>2001</risdate><volume>73</volume><issue>5</issue><spage>878</spage><epage>883</epage><pages>878-883</pages><issn>0003-2700</issn><eissn>1520-6882</eissn><coden>ANCHAM</coden><abstract>STM gold tips chemically modified with 4-mercaptopyridine (4MP) were found capable of discriminating zinc(II) 5,15-bis(4-octadecyloxyphenyl)porphyrin (Por-Zn) from its metal-free porphyrin (Por-2H) and nickel(II) complexes (Por-Ni) in the mixed monolayers of these compounds, spontaneously formed at the solution/graphite interface. The porphyrin centers in STM images observed with 4MP-modified tips exhibited bright spots, while those measured with unmodified tips exhibited the porphyrin centers as dark depressions. The centers of Por-Zn were brighter than those of Por-2H and Por-Ni, thereby allowing the discrimination of Por-Zn from Por-2H or Por-Ni in mixed monolayers. The changes in the contrasts of porphyrin centers of Por-2H and Por-Zn/Por-Ni were explained by facilitated electron tunneling due to hydrogen bond and metal coordination interactions, respectively, between porphyrin centers and the pyridyl group of 4MP on the tip.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>11289431</pmid><doi>10.1021/ac001056e</doi><tpages>6</tpages></addata></record> |
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subjects | Chemistry Exact sciences and technology General and physical chemistry Hydrogen Hydrogen Bonding Metals Metals - chemistry Microscopy, Scanning Tunneling - methods Porphyrins - chemistry Scientific imaging Solid-liquid interface Surface physical chemistry |
title | Scanning Tunneling Microscopy with Chemically Modified Tips: Discrimination of Porphyrin Centers Based on Metal Coordination and Hydrogen Bond Interactions |
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