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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents

ID: 435420.0, Fritz-Haber-Institut / Physical Chemistry
Reversing the thermal stability of a molecular switch on a gold surface: Ring-opening reaction of nitrospiropyran
Authors:Piantek, Marten; Schulze, Gunnar; Koch, Matthias; Franke, Katharina J.; Leyssner, Felix; Krüger, Alex; Navío, Cristina; Miguel, Jorge; Bernien, Matthias; Wolf, Martin; Kuch, Wolfgang; Tegeder, Petra; Pascual, José Ignacio
Date of Publication (YYYY-MM-DD):2009-08-13
Title of Journal:Journal of the American Chemical Society
Journal Abbrev.:J. Am. Chem. Soc.
Issue / Number:35
Start Page:12729
End Page:12735
Copyright:© 2009 American Chemical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The ring-opening/closing reaction between spiropyran (SP) and merocyanine (MC) is a prototypical thermally and optically induced reversible reaction. However, MC molecules in solution are thermodynamically unstable at room temperature and thus return to the parent closed form on short time scales. Here we report contrary behavior of a submonolayer of these molecules adsorbed on a Au(111) surface. At 300 K, a thermally induced ring-opening reaction takes place on the gold surface, converting the initial highly ordered SP islands into MC dimer chains. We have found that the thermally induced ring-opening reaction has an activation barrier similar to that in solution. However, on the metal surface, the MC structures turn out to be the most stable phase. On the basis of the experimentally determined molecular structure of each molecular phase, we ascribe the suppression of the back reaction to a stabilization of the planar MC form on the metal surface as a consequence of its conjugated structure and large electric dipole moment. The metal surface thus plays a crucial role in the ring-opening reaction and can be used to alter the stability of the two isomers.
External Publication Status:published
Document Type:Article
Communicated by:Martin Wolf
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Piantek M, Schulze G, Koch M, Franke KJ, Leyssner F, Krüger A, Navío C, Miguel J, Bernien M, Wolf M, Kuch W, Tegeder P, Pascual J-I, Freie Univ Berlin, FB Physik, Inst Expt Phys, Arnimallee 14, 14195 Berlin, Germany
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