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Effect of Ring Strain on the Charge Transport of a Robust Norbornadiene-Quadricyclane-Based Molecular Photoswitch

Behabitu Ergette Tebikachew (Institutionen för kemi och kemiteknik, Polymerteknologi) ; H. P. B. Li ; A. Pirrotta ; K. Borjesson ; G. C. Solomon ; J. Hihath ; Kasper Moth-Poulsen (Institutionen för kemi och kemiteknik, Polymerteknologi)
Journal of Physical Chemistry C (1932-7447). Vol. 121 (2017), 13, p. 7094-7100.
[Artikel, refereegranskad vetenskaplig]

Integrating functional molecules into single-molecule devices is a key step toward the realization of future computing machines based on the smallest possible components. In this context, photoswitching molecules that can make a transition between high and low conductivity in response to light are attractive candidates. Here we present the synthesis and conductance properties of a new type of robust molecular photothermal switch based on the norbornadiene (NB)-quadricyclane (QC) system. The transport through the molecule in the ON state is dominated by a pathway through the pi-conjugated system, which is no longer available when the system is switched to the OFF state. Interestingly, in the OFF state we find that the same pathway contributes only 12% to the transport properties. We attribute this observation to the strained tetrahedral geometry of the QC. These results challenge the prevailing assumption that current will simply flow through the shortest through-bond path in a molecule.

Nyckelord: Thermoelectric Properties, Quantum Interference, Electronic Device, Junctions, Conductance, Switches, Length, Photoisomerization, Conductivity, Diarylethene



Denna post skapades 2017-05-15.
CPL Pubid: 249332

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Polymerteknologi

Ämnesområden

Polymerteknologi

Chalmers infrastruktur