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Steric Turnoff of Vibrationally Mediated Negative Differential Resistance in a Single Molecule
Author(s) -
Gaudioso Jennifer,
Ho Wilson
Publication year - 2001
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/1521-3773(20011105)40:21<4080::aid-anie4080>3.0.co;2-4
Subject(s) - steric effects , foundation (evidence) , work (physics) , research center , resistance (ecology) , center (category theory) , chemistry , political science , engineering , stereochemistry , crystallography , biology , law , mechanical engineering , ecology
Negative differential resistance (NDR), mediated by vibrational excitation, is strongly dependent on molecular structure and dynamics, according to scanning tunneling microscopy on Cu(001)‐bound pyrrolidine and N ‐methylpyrrolidine at 9 K. Tunneling electrons cause the former to switch between conformations I and II (see picture), so that NDR is observed. The methyl group of of the latter compound restricts it to a single conformation (see picture), and a linear current–voltage characteristic results.