The self-assembly of large organic molecules has become a vividly explored and interdisciplinary field in science. One major goal is the tailored fabrication of highly ordered, molecular networks, which are stabilized on a metal surface. Metalloporphyrins receive particular attention, because their distinct intrinsic functionalities make them promising candidates for applications in chemical sensors, solar cells, and for tailored catalytic processes. Based on scanning tunneling microscopy investigations, several novel and fundamental contributions are presented, which has led to a new level of understanding. Highlights are the results with respect to intramolecular conformation and supramolecular ordering, electronic interactions with the substrate, surface confined synthesis such as in-situ metallation reactions, and ligand effects.The number of publications this work has led to emphasises its quality and significance.

1;Supervisor's Foreword;8 2;Acknowledgments;10 3;Contents;11 4;List of Abbreviations;15 5;List of Figures;16 6;1 Introduction;27 6.1;References;28 7;2 Fundamentals;30 7.1;2.1...Principle of the STM;30 7.2;2.2...Origin of the Tunneling Current;32 7.3;2.3...Scanning Tunneling Spectroscopy;34 7.4;2.4...Contrast Mechanism of Molecular Adsorbates;35 7.5;2.5...Temperature Programmed Desorption;37 7.6;2.6...Low Energy Electron Diffraction;39 7.7;References;40 8;3 Experimental Setup;41 8.1;3.1...UHV System;41 8.2;3.2...Scanning Tunneling Microscope;42 8.3;3.3...Control Electronics and Vibration Isolation;45 8.4;3.4...Ag(111);46 8.5;3.5...Porphyrinoids;48 8.6;3.6...Preparation of thin Porphyrinoid Layers;49 8.7;3.7...Vapor-deposition of Cobalt and Iron;51 8.8;References;52 9;Part IResults;53 9.1;4 Self-Assembly and Individual Appearance of Tetraphenylporphyrins on Ag(111);54 9.1.1;4.1...Introduction;54 9.1.2;4.2...Epitaxial Growth;55 9.1.3;4.3...Appearance and Intramolecular Conformation;59 9.1.4;4.4...Ordering Aspects;60 9.1.5;4.5...Conclusion;66 9.1.6;References;67 9.2;5 Self-Assembly and Individual Appearance of Cobalt(II)-Tetrakisditertbutylphenylporphyrins on Ag(111);69 9.2.1;5.1...Polymorphism of CoTTBPP;69 9.2.1.1;5.1.1 Conclusion;81 9.2.2;5.2...Polarity-Dependent Appearance;82 9.2.2.1;5.2.1 Conclusion;83 9.2.3;References;84 9.3;6 Coordination of Iron and Cobalt Atoms by Tetraphenylporphyrin Monolayers on Ag(111) and Formation of Metal(II)-Tetraphenylporphyrin;85 9.3.1;6.1...Introduction;85 9.3.2;6.2...Coordination of Post-deposited Iron Atoms by Tetraphenylporphyrin Monolayers;86 9.3.2.1;6.2.1 Conclusion;90 9.3.3;6.3...Coordination of Pre-deposited Iron Atoms by Tetraphenylporphyrin Monolayers;90 9.3.3.1;6.3.1 Conclusion;93 9.3.4;6.4...Coordination of Post-deposited Cobalt Atoms by Tetraphenylporphyrin Monolayers;93 9.3.4.1;6.4.1 Conclusion;97 9.3.5;6.5...Discussion of the Metalation Reaction;97 9.3.6;References;99 9.4;7 Different Aspects of 2H-Tetrakis-di-tert-butylphenylporphyrin on Ag(111);101 9.4.1;7.1...Introduction;101 9.4.2;7.2...Monolayer Preparation;102 9.4.3;7.3...Arrangement of 2HTTBPP;104 9.4.3.1;7.3.1 Conclusion;107 9.4.4;7.4...Voltage-Dependent Appearance;108 9.4.4.1;7.4.1 Conclusion;109 9.4.5;7.5...Direct Metalation of 2HTTBPP with Co-adsorbed Iron;109 9.4.5.1;7.5.1 Conclusion;110 9.4.6;References;111 9.5;8 Direct Metalation of a Phthalocyanine Monolayer on Ag(111) with Co-adsorbed Iron Atoms;112 9.5.1;8.1...Introduction;112 9.5.2;8.2...Results;113 9.5.3;8.3...Conclusion;119 9.5.4;References;119 9.6;9 Multicomponent Adlayers of Tetraphenylporphyrins on Ag(111);121 9.6.1;9.1...Understanding the Contrast Mechanism in STM Images of Cobalt Tetraphenylporphyrin on Ag(111);121 9.6.1.1;9.1.1 Introduction;122 9.6.1.2;9.1.2 Results;122 9.6.1.3;9.1.3 Conclusion;128 9.6.2;9.2...Fingerprints of Different Porphyrins;129 9.6.2.1;9.2.1 Introduction;129 9.6.2.2;9.2.2 Results;131 9.6.2.3;9.2.3 Conclusion;140 9.6.3;9.3...Addressing Molecular Orbitals of Cobalt- and Iron-Tetraphenylporphyrins by Continuous Imaging Tunneling Spectroscopy;141 9.6.3.1;9.3.1 Introduction;141 9.6.3.2;9.3.2 Results;142 9.6.3.3;9.3.3 Conclusion;147 9.6.4;References;147 9.7;10 Modification of the Growth of Iron on Ag(111) by Predeposited Organic Monolayers;149 9.7.1;10.1...Introduction;149 9.7.1.1;10.1.1 Growth of Fe on Ag(111);150 9.7.1.2;10.1.2 Growth of Fe on Ag(111) Precovered with Different Tetrapyrrolic Monolayers;152 9.7.2;10.2...Conclusion;159 9.7.3;References;159 9.8;11 Geometric and Electronic Aspects of CoTPP upon Dosage of NO;161 9.8.1;11.1...Introduction;161 9.8.2;11.2...In Situ Observation of the Rearrangement of CoTPP on Ag(111);162 9.8.3;11.3...Conclusion;166 9.8.4;11.4...Modification of the Appearance of CoTPP upon Formation of NO-CoTPP;167 9.8.5;11.5...Conclusion;170 9.8.6;References;171 9.9;12 Self-Assembly and Voltage-Dependent Appearance of Octaethylporphyrins;172 9.9.1;12.1...Introduction;172 9.9.2;12.2...Results;173 9.9.3;12.3...Conc

Buchner, Florian

Publikationen von Buchner, Florian

ISBN	9783642148408
Artikelnummer	9783642148408
Medientyp	E-Book - PDF
Copyrightjahr	2010
Verlag	Springer-Verlag
Umfang	164 Seiten
Sprache	Englisch
Kopierschutz	Digitales Wasserzeichen