A new molecular diode based on biphenyl-co-bispyrimidine was synthesized and showed a pronounced rectifying effect. Further studies indicate that protonation on the nitrogen atoms of the diode molecule by strong acids can reversibly alter the rectifying direction. This phenomenon can be envisioned as a starting point for single molecule detection devices.

A sequential deprotection and immobilization procedure was enabled by the synthesis of two thiophene–thiazole diblock oligomers with two different thiol protection groups. Investigation of the I/V behaviors of these diblock molecules between two gold electrodes (see picture) showed that the rectifying direction was controlled by their orientation between the electrodes.

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