A molecule with pyrene as the donor moiety and perylene bisimide as the acceptor moiety, and two thioester tails electric current by resonance of the Fermi levels of two gold electrodes with its frontier molecular orbitals [1]. Monolayers of this molecule were transferred onto glass, silicon, and gold substrates using the Langmuir-Blodgett (LB) technique. Pink floating islands of monolayer were formed upon compression and transferred onto the substrates at a surface pressure of 18 mN/m. A constant molecular area of 55 �2/molecule was measured before transfer. On silicon the monolayer was studied by ellipsometry and Atomic Force Microscopy (AFM): its thickness was 3.6 nm � 0.2 nm. X-Ray Photoelectron Spectroscopy (XPS) on a Au substrate showed S peaks from the thioester, thioester-gold complex, and a thiolate bonded to gold. The monolayer, sandwiched between Au electrodes, when cycled up to �1.5 V, rectified at forward bias with an exponential turn-on at +0.7 V, while at reverse bias the turn-on occurred at -1.2 V. Cycling up to �2 V switched current transport from forward to reverse bias.[1] M. S. Johnson, R. Kota, D. L. Mattern, and R. M. Metzger, �A Two-Faced �Janus� Unimolecular Rectifier Exhibits Rectification Reversal�, submitted to Langmuir.

Janus-type unimolecular rectifier

247th National Meeting (2014)

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