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Cover Picture: Controlled Nanoscale Mechanical Phenomena Discovered with Ultrafast Electron Microscopy (Angew. Chem. Int. Ed. 48/2007)
Author(s) -
Flannigan David J.,
Lobastov Vladimir A.,
Zewail Ahmed H.
Publication year - 2007
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200790245
Subject(s) - tetracyanoquinodimethane , ultrashort pulse , nanoscopic scale , materials science , laser , stacking , microscopy , crystal (programming language) , crystallography , electron , nanotechnology , optics , molecule , chemistry , physics , nuclear magnetic resonance , organic chemistry , quantum mechanics , computer science , programming language
Ultrafast electron microscopy … … has been used to view the reversible expansion and contraction of a single crystal of [Cu(TCNQ)] (see film strip; TCNQ=7,7,8,8‐tetracyanoquinodimethane), induced with near‐infrared laser pulses, as well as the photoinduced reduction of copper ions to form discrete metal clusters (see picture, top right), as described by A. H. Zewail et al. in their Communication on Page 9206 ff. The crystal expands along the π‐stacking axis of the TCNQ molecules upon exposure to light, but rapidly returns to its original state in the absence of laser light.