Mechanical shuttling of linear motor-molecules in condensed phases on solid substrates

Nano Letters

Volumn 4, Issue 11, 2004, Pages 2065-2071

  Huang, Tony Jun ^a,b   Tseng, Hsian Rong ^a   Sha, Lin ^a   Lu, Weixing ^a   Brough, Branden ^a   Flood, Amar H ^a   Yu, Bi Dan ^a   Celestre, Paul C ^a   Chang, Jane P ^a   Stoddart, J Fraser ^a,b   Ho, Chih Ming ^a,c  

^a UNIVERSITY OF CALIFORNIA   (United States)

^b Department of Chemistry ^*  (United States)

^c Mechanical Engineering Department   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CHEMICAL REAGENTS; MECHANICAL SWITCHING; MOTOR MOLECULES; NANOELECTROMECHANICAL SYSTEMS (NEMS);

CONDENSATION; ELECTROMECHANICAL DEVICES; ISOTHERMS; LANGMUIR BLODGETT FILMS; NANOTECHNOLOGY; REDOX REACTIONS; SELF ASSEMBLY; X RAY PHOTOELECTRON SPECTROSCOPY;

MOLECULAR DYNAMICS;

EID: 9744276000     PISSN: 15306984     EISSN: None     Source Type: Journal    
DOI: 10.1021/nl035099x     Document Type: Article

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42. 2/molecule-min. All isotherms, which were obtained for starting-state and oxidized molecules, were highly reproducible.
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48. 6+ shows a similarly weak and red-shifted band at 550 nm that displays a linear correlation of intensity with the number of layers. These observations lend qualitative support to the redox-controlled mechanical switching of the amphiphilic bistable rotaxanes in Langmuir films.
49. 2: = 5:1) cleaning for 5 min, (ii) deionized water cleaning for 5 min, and (iii) air-drying.
50. Film thickness measurements were performed using a Gaertner L116B ellipsometer with an index of refraction of 1.46.
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52. Molecular modeling was performed in ChemBats3D by extending the molecule fully and then optimizing with the MM2 force field to obtain "correct" bond lengths and angles. The distance was measured from the center of the TTF unit to the center of the DNP unit. This fully extended conformation, which is employed for convenience in the graphical representations, does not reflect the variety of folded conformations that these compounds may realistically occupy in solution or in Langmuir and LB monolayers.
53. -3 M. Typically, the sample was immersed in the oxidant solution for 30-40 min. Ellipsometry data show that the thickness of the films did not change while the samples were immersed in the solution of the oxidant.