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Titolo:
Scanning tunneling microscopy investigation of a chirally pure molecule atthe liquid-solid interface: Unambiguous topographic markers
Autore:
Yablon, DG; Guo, JS; Knapp, D; Fang, HB; Flynn, GW;
Indirizzi:
Columbia Univ, Dept Chem, New York, NY 10027 USA Columbia Univ New York NY USA 10027 iv, Dept Chem, New York, NY 10027 USA Columbia Univ, Columbia Radiat Lab, New York, NY 10027 USA Columbia Univ New York NY USA 10027 ia Radiat Lab, New York, NY 10027 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 19, volume: 105, anno: 2001,
pagine: 4313 - 4316
SICI:
1520-6106(20010517)105:19<4313:STMIOA>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
(S)-2-BROMOHEXADECANOIC ACIDS; ORGANIC-MOLECULES; FUNCTIONAL-GROUPS; IMAGE-CONTRAST; GRAPHITE; STM; MONOLAYERS; DIFFERENTIATION; ADSORBATES; CRYSTALS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Flynn, GW Columbia Univ, Dept Chem, New York, NY 10027 USA Columbia Univ New York NY USA 10027 hem, New York, NY 10027 USA
Citazione:
D.G. Yablon et al., "Scanning tunneling microscopy investigation of a chirally pure molecule atthe liquid-solid interface: Unambiguous topographic markers", J PHYS CH B, 105(19), 2001, pp. 4313-4316

Abstract

The self-assembly of mixtures of hexadecanoic acid with (R)-2-Br-hexadecanoic acid and hexadecanoic acid with (S)-2-Br-hexadecanoic acid have been investigated on graphite at the liquid-solid interface using scanning tunneling microscopy (STM). The STM study of a chirally pure species provides an unambiguous assignment of geometric configurations for various functional groups in these molecules. Specifically, the absolute conformation of the bromine atom in 2-Br-hexadecanoic acid has been determined to be pointing "up"away from the graphite surface. This assignment confirms an earlier conjecture that Br atoms appearing with high tunneling probability in STM images are conformationally in the up position. Furthermore, this geometric designation reinforces an explanation for the spontaneous separation of racemic 2-Br-hexadecanoic acid into enantiomerically pure domains as a process induced by energetically favorable conformations of 2-Br-hexadecanoic acid on a surface.

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Documento generato il 28/09/20 alle ore 13:31:09