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Modulating Large‐Area Self‐Assembly at the Solid–Liquid Interface by pH‐Mediated Conformational Switching
Author(s) -
Piot Luc,
Meudtner Robert M.,
El Malah Tamer,
Hecht Stefan,
Samorì Paolo
Publication year - 2009
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200802566
Subject(s) - monolayer , conformational change , trifluoroacetic acid , chemistry , self assembly , molecule , pyridine , crystallography , rosette (schizont appearance) , stereochemistry , chemical physics , organic chemistry , biochemistry , immunology , biology
Dynamic surfaces : The conformational transition of 2,6‐bis(1‐aryl‐1,2,3‐triazol‐4‐yl)pyridine (BTP) derivatives, triggered by a change in pH, has been observed with a sub‐nm resolution by STM at the solid–liquid interface. Upon addition of trifluoroacetic acid two different BTP molecules, each forming a highly ordered physisorbed monolayer, underwent significant conformational changes from their “rosette” to their “tetragon” forms, as reflected in dramatically altered 2D self‐assembly over large areas extending over hundreds of nanometers (see graphic).