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Polarizability As A Molecular Descriptor For Conductance In Organic Molecular Circuits

Shobeir Mazinani, Reza Vatan Meidanshahi, J. Palma, P. Tarakeshwar, T. Hansen, M. A. Ratner, V. Mujica
Published 2016 · Chemistry

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We explore a connection between the static molecular polarizability and the molecular conductance that arises naturally in the description of electrified molecular interfaces and that has recently been explored experimentally. We have tested this idea by using measured conductance of few different experimental design motifs for molecular junctions and relating them to the molecular polarizability. Our results show that for a family of structurally connected molecules the conductance decreases as the molecular polarizability increases. Within the limitations of our model, this striking result is consistent with the physically intuitive picture that a molecule in a junction behaves as a dielectric that is polarized by the applied bias, hence creating an interfacial barrier that hinders tunneling. The use of the polarizability as a descriptor of molecular conductance offers significant conceptual and practical advantages over a picture based on molecular orbitals. To further illustrate the plausibility of th...
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