Packing of Br(CH2)10COOH and Br(CH2)11COOH on graphite: an odd-even length effect observed by scanning tunneling microscopy

Article Abstract:

Scanning tunneling microscopic studies were performed to study thin film and interfacial ordering in doubly substituted 11-bromoundecanoic acid, Br(CH2)10COOH, and 12-bromododecanoic acid, Br(CH2)11COOH. In particular, the influence of chain length on the carbon atom arrangements were analyzed. Samples of the acids adsorbed at the phenyloctane solution-graphite interface were examined. Both molecules display structures different from their monosubstituted correlates. Moreover, the number of odd or even hydrocarbon chains affected the packing structure of the molecules.

Conformational analysis, Molecular structure, Graphite

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Direct determination of the chirality of organic molecules by scanning tunneling microscopy

Article Abstract:

Experiments were performed to investigate the chiral molecules (R)/(S)-2-bromohexadecanoic acid adsorbed on a graphite surface. The chirality of the molecules were measured in a liquid/solid interface using scanning tunneling microscopic (STM) analyses. The separation of the enantiomers at the graphite surface was observed. Mirror image packing patterns on the graphite surface were demonstrated. The study confirmed the usefulness of STM in determining the chirality of organic molecules.

Chirality, Organic compounds, Molecules

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Scanning tunneling microscopy investigation of a chirally pure molecule at the liquid-solid interface: unambigous topographic markers

Article Abstract:

The self-assembly of a mixture of hexadecanoic acid with (R)-2-Br-hexadecanois acid and (S)-2-Br-hexadecanois acid at the liquid-solid interface is investigated using scanning tunneling microscopy (STM). The absolute conformation of the bromine atom in 2-Br-hexadecanoic acids is determined to be pointing up away from the graphite surface.

Science & research, All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Bromine Compounds, Observations, Acids

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