Formation of chiral interdigitated multilayers at the air-liquid interface through acid-base interactions

Science

Volumn 274, Issue 5295, 1996, Pages 2046-2049

  Kuzmenko, Ivan ^a   Buller, Ronith ^a   Bouwman, Wim G ^b   Kjær, Kristian ^b   Als Nielsen, Jens ^c   Lahav, Meir ^a   Leiserowitz, Leslie ^a  

^a WEIZMANN INSTITUTE OF SCIENCE   (Israel)

^b TECHNICAL UNIVERSITY OF DENMARK   (Denmark)

^c UNIVERSITY OF COPENHAGEN   (Denmark)

Author keywords

[No Author keywords available]

Indexed keywords

ACID BASE BALANCE; ARTICLE; ATOMIC FORCE MICROSCOPY; CHIRALITY; PRIORITY JOURNAL; SURFACE PROPERTY; X RAY DIFFRACTION;

EID: 0030466107     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.274.5295.2046     Document Type: Article

References (20)

1. J. L. Slater and C. H. Huang, Prog. Lipid Res. 27, 325 (1988).
2. M. C. Brianso, M. Leclercq, J. Jacques, Acta Crystallogr. B35, 2751 (1979).
3. S. Larsen and H. L. Diego, ibid. B49, 303 (1993).
4. 25 = -63.2 (C = 1.01 g/liter tetrahydrofuran).
5. 25 = -63.2 (C = 1.01 g/liter tetrahydrofuran).
6. 2 per molecule.
7. 15-MA was spread at room temperature in a Langmuir trough and then cooled to 5°C.
8. J. Als-Nielsen et al., Phys. Rep. 246, 251 (1994).
9. J. Majewski, Chem. Eur. J. 1, 304 (1995).
10. We implied, although we have not proven, that no significant changes occurred on deposition of the films on a solid support. The AFM measurements were performed with Nanoscope III FM (Digital Instruments, Goleta, CA) at ambient temperature with a commercial silicon nitride tip, attached to a cantilever with a spring constant of 0.38 N/m.
11. Film depositions were done on a NIMA trough (NIMA Technology, Coventry, UK) at 20°C and at a surface pressure of ∼40 mN/m. Film was transferred onto mica at a constant speed of 10 mm/min.
12. For the silicon nitride tip used in the AFM studies, the lateral friction coefficient is qualitatively proportional to the hydrophilicity of the surface. A detailed analysis of different factors influencing the lateral friction for self-assembled monolayers on mica is given in Y. Liu et al. [Langmuir 12, 1235 (1996)].
13. α radiation from a 18-kW rotating anode generator. The structure was solved and refined with the use of SHELXL-91 software. The coordinates have been submitted to the Cambridge Crystallographic Database.
14. Subtraction of a 25 A thickness of the crystalline bilayer as in the 3D structure from the 38(4) Å trilayer thickness obtained by AFM leaves 13(4) Å, which is compatible within a standard deviation with the 16(2) Å monolayer thickness.
15. Comparison of the observed and calculated Bragg rods (the latter obtained by x-ray structure factor computations) showed that the alkyl chains on the top level of the trilayer are disordered and there is no ordered binding of PEA from the subphase.
16. Beam damage had in fact occurred, but we lacked the quantitative data to introduce a proper correction.
17. S. P. Zingg, E. M. Arnett, A. T. McPhail, A. A. Bothner-By, W. R. Gilkerson, J. Am. Chem. Soc. 110, 1565 (1988).
18. H. L. Diego, Acta Chem. Scand. 48, 306 (1994).
19. In the complex (R-MA, R-PEA) the phenyl rings within a layer are uniformly tilted in a manner compatible with close packing of the hydrocarbon chains; in the (R-MA, S-PEA) salt the phenyl rings are not uniformly tilted.
20. We thank S. Matlis for performing the AFM measurements. Supported by the Minerva Foundation, the German Israeli Foundation (GIF), the Danish Foundation for Natural Sciences, and HASYLAB, DESY, Hamburg, Germany (beam time)