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In an ordered porphyrin molecular array, the tautomerism reaction is frozen at room temperature. In particular, G. Bussetti et al. use the H‐H tautomer alignment as a logic device (1/0 states) on page 958 by perturbing the inner cavity of the molecule. The state flip is readable by an optical probe.
A major challenge in molecular electronics is to develop logic devices based on a truly intramolecular switching mechanism. Recently, a new type of molecular device has been proposed where the switching characteristic is mediated by the bistability in the position of the two hydrogen atoms which can occupy different, energetically equivalent positions (tautomerization) in the inner cavity of porphyrins...
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