Discrimination of functional groups with scanning tunneling microscopy using chemically modified tips: Recognition of ether oxygens through hydrogen bond interactions

2001 ◽  
Vol 3 (10) ◽  
pp. 1867-1869 ◽  
Author(s):  
Tomoaki Nishino ◽  
Philippe Bühlmann ◽  
Takashi Ito ◽  
Yoshio Umezawa
Keyword(s):  
Hydrogen Bond ◽  
Scanning Tunneling Microscopy ◽  
Functional Groups ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Chemically Modified ◽  
Hydrogen Bond Interactions

ELECTRIC-FIELD DEPENDENCE OF MOLECULAR CONFORMATIONS OBSERVED BY USING SCANNING TUNNELING MICROSCOPY

NANO ◽  
2008 ◽  
Vol 03 (02) ◽  
pp. 83-94
Author(s):  
XIAO JING MA ◽  
RUI ZHANG ◽  
YONG TAO SHEN ◽  
XIAO HUI QIU ◽  
YAN LIAN YANG ◽  
...  
Keyword(s):  
Electric Field ◽  
Scanning Tunneling Microscopy ◽  
Functional Groups ◽  
Field Dependence ◽  
Conformational Changes ◽  
Supramolecular Structures ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Molecular Conformations ◽  
Electric Field Dependence

We review the progress in observation of electrically induced conformational changes of a range of single molecules and molecular assemblies using scanning tunneling microscopy (STM). Recent results using species with optical active functional groups and supramolecular structures confirmed the previously observed effects that the cholesterol molecules with soft linkers have the conformational bistability when switching the bias polarity, while no discernable changes were observed for the mesogen molecules, containing rigid linking units. In addition, it was also observed that the linker units could have appreciable impacts on the assembling characteristics.

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