Molecular Photography in the Undergraduate Laboratory: Identification of Functional Groups Using Scanning Tunneling Microscopy

Giancarlo, Leanna C.; Fang, Hongbin; Avila, Luis; Fine, Leonard W.; Flynn, George W.

doi:10.1021/ed077p66

Cited by 15 publications

(19 citation statements)

References 26 publications

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“…Recent interest in nanometer size devices has encouraged the investigation of intra-and intermolecular forces that control and drive two-dimensional ordered nanostructures on a surface formed from the self-assembly of small molecular building blocks. A vast literature is available on the study of the selfassembly of various molecules on different substrates at liquid/ solid, [1][2][3][4][5][6][7][8][9][10][11][12][13][14]17,22,23,[25][26][27][29][30][31][32][33][34][36][37][38]42,[44][45][46][47][48][49][54][55][56][57] gas (air)/solid, 18 and vacuum/solid interfaces. 15,16,[19][20][21]24,28,35,…”

Section: Introductionmentioning

confidence: 99%

“…However, in order to probe the atomic scale subtleties of hydrogen-bonded moieties of lower dimensionality, it is necessary to use scanning probe techniques. Scanning tunneling microscopy (STM) 27 is one of the most recent and sophisticated techniques used to analyze two-dimensional structural properties. Its ability to provide detailed, high-resolution atomic and molecular information offers a unique opportunity to investigate the conformation and symmetry of the surface and of monolayer films on a substrate.…”

Section: Introductionmentioning

confidence: 99%

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An Experimental and Theoretical Study of the Formation of Nanostructures of Self-Assembled Cyanuric Acid through Hydrogen Bond Networks on Graphite

et al. 2007

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The self-assembly of cyanuric acid into ordered nanostructures on a crystalline substrate, highly ordered pyrolytic graphite (HOPG), has been investigated at low temperature under ultrahigh vacuum (UHV) conditions by means of scanning tunneling microscopy in conjunction with theoretical simulations. Many domains with different self-assembly patterns were observed. One such domain represents the formation of an open 2D rosette (cyclic) structure from the self-assembly process, the first observation of this type of structure for pure cyanuric acid on a graphite substrate. Each self-assembled domain exhibits characteristic superstructures formed through different hydrogen bond networks at low coverage and low deposition rate. Experimental observation of coexistent, two-dimensional crystalline structures with distinct hydrogen bond patterns is supported by energy minimizations and molecular dynamics calculations, which show multiple stable structures for this molecule when self-assembled on graphite.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Experimental and Theoretical Study of the Formation of Nanostructures of Self-Assembled Cyanuric Acid through Hydrogen Bond Networks on Graphite

et al. 2007

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“…An electrontunneling device, M-I-M tunnel diode [34][35][36][37][38] and the corresponding features of a STM [25,[39][40][41][42][43][44][45] are depicted in Fig. 2.…”

Section: Resultsmentioning

confidence: 99%

Electron affinity states of metal supported phthalocyanines measured by tunneling spectroscopy

Hipps

Mazur

2012

J. Porphyrins Phthalocyanines

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Orbital Mediated Tunneling Spectroscopy OMTS (elastic electron tunneling) was employed in measuring electron affinity levels (EA) of unsubstituted, alkylated, sulfonated, and metalated phthalocyanines (Pc) adsorbed as single molecules or aggregates on metal substrates and imbedded in metal-insulator-metal (M-I-M) devices. MPc complexes were vapor deposited, solution phase doped, or transferred as Langmuir–Blodgett films. It was determined that while the nature of the substituents has a large effect on the gas phase electron affinities, they play a minimal role on the electron affinities of metal supported phthalocyanines. Moreover, the orientation of monolayer films and the method of film deposition (vapor, solution, Langmuir–Blodgett) also appear to play only a minor role in determining the electron affinities. Electrochemical reduction potentials obtained for the solution phase molecular systems are compared to the OMTS data and a strong correlation is observed. In contrast, the predicted EA values for the gas phase molecules show little correspondence with their OMTS equivalents for adsorbed phthalocyanines. Inelastic scattering from phthalocyanine π→π* transitions and metal centered d–d transitions are observed for chromophores imbedded in tunnel diodes. Both the observed lowest spin forbidden transitions and the calculated gas phase HOMO–LUMO gaps are only weakly affected by Pc substitution and surface orientation.

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“…Didaktisch mehr oder weniger aufbereitete Untersuchungen in der Hochschullehre bezüglich RTMSelbstbau [9], Oberflächen-und Adsorbatstrukturen bzw. intermolekularen Wechselwirkungen [10,11] und kinetische Untersuchungen [12] sind bereits beschrieben worden, die Mehrzahl dabei allerdings auf einem allgemeinen qualitativen Niveau. Dies betrifft gleichfalls Aufsätze zur didaktischen Begründung der RTM.…”

Section: Introductionunclassified

Das didaktische Potential der Rastertunnelmikroskopie in der Hochschullehre

Penner

Most

Scheier

et al. 2015

Chemkon

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Zusammenfassung: Dem Rastertunnelmikroskop kommt in der Hochschulausbildung eine immer grçßere Bedeutung zu, erlaubt es doch einen relativ einfachen Zugang nicht nur zur Sichtbarmachung der atomaren und elektronischen Struktur von Festkçrpern, sondern auch zu verwandten, meist schwer fasslichen physikalischchemischen Themen und Phänomenen. Dazu gehçrt auch der quantenmechanische Tunneleffekt, welcher der Messmethode zugrunde liegt. Didaktisch wertvoll, erlaubt die neue Generation der eigens für den Unterricht konzipierten Rastertunnelmikroskope eine einfache Bedienung und Datenanalyse durch Studierende selbst. Im vorliegenden Manuskript werden die Mçglichkeiten des Einsatzes solcher Mikroskope in der universitären Lehre kritisch beleuchtet und durch einen Ausblick auf den Schulunterricht ergänzt. Stichworte: atomare Struktur · Rastertunnelmikroskop · TunneleffektUse of the Scanning Tunneling Microscope in University Teaching -didactic potential and restrictions Abstract: The use of the Scanning Tunneling Microscope (STM) in university teaching allows for both a very easy access to the atomic and electronic structure of solids and to gain insight into various, sometimes hardly comprehensible, physico-chemical phenomena like the quantum mechanical tunneling effect. The new generation of easy-to-use STMs, specially designed for teaching purposes, allows self-operation and data-analysis by interested university students. The present manuscript critically discusses the possibilities of STM in university teaching, but also gives an outlook to the use in high-school teaching.

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Molecular Photography in the Undergraduate Laboratory: Identification of Functional Groups Using Scanning Tunneling Microscopy

Cited by 15 publications

References 26 publications

An Experimental and Theoretical Study of the Formation of Nanostructures of Self-Assembled Cyanuric Acid through Hydrogen Bond Networks on Graphite

An Experimental and Theoretical Study of the Formation of Nanostructures of Self-Assembled Cyanuric Acid through Hydrogen Bond Networks on Graphite

Electron affinity states of metal supported phthalocyanines measured by tunneling spectroscopy

Das didaktische Potential der Rastertunnelmikroskopie in der Hochschullehre

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