Preparation of chiral surfaces from achiral molecules by controlled symmetry breaking

Angewandte Chemie - International Edition

Volumn 44, Issue 12, 2005, Pages 1821-1823

  Berg, Ava M ^a   Patrick, David L ^a  

^a WESTERN WASHINGTON UNIVERSITY   (United States)

Author keywords

Chirality; Liquid crystals; Monolayers; Scanning probe microscopy; Thin films

Indexed keywords

ADSORPTION; GRAPHITE; MAGNETIC FIELDS;

CHIRAL CONTROL; CHIRAL SURFACES; CHIRALITY;

LIQUID CRYSTALS;

EID: 17044411772     PISSN: 14337851     EISSN: None     Source Type: Journal    
DOI: 10.1002/anie.200461833     Document Type: Article

References (24)

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21. Once crystallized, molecules in the monolayer did not rotate; samples removed from the magnet retained their chirality and orientation indefinitely.
22. Millimeter-sized crystals were extracted from graphitic calcite mineral specimens obtained from the Lead Hill Mine, Ticonderoga, NY by dissolving the calcite matrix in HCl (12m) (R. J. Lauf, A. E. Pasto, The Mineralogical Record 1983, Jan.-Feb., 25). Specimens were purchased from the Mineralogical Research Company, San Jose, CA.
23. The left- and right-handed designations used herein conform to the convention adopted in most previous studies of 8CB on graphite, but it should be noted these designations are arbitrary and not based on CIP nomenclature rules.
24. The spread in the distributions of molecular orientations shown in the histograms arises principally from three factors: 1) measurement error associated with thermal drift during STM imaging and angular alignment of the samples; 2) imperfections on the single crystal substrates; and 3) alternative packing motifs in the 8CB monolayer. 8CB is known to crystallize into a family of closely related polymorphe, of which the STM image and models in Figure 1 are the most common. In some minority structures the cyanobiphenyl heads possess slightly different orientations in the unit cell. (D. L. Patrick, T. P. Beebe, Jr., Langmuir 1994, 10, 298.)