Digital processing with a three-state molecular switch

The Journal of Organic Chemistry
Françisco M RaymoDavid J Williams

Abstract

Certain molecular switches respond to input stimulations producing detectable outputs. The interplay of these signals can be exploited to reproduce basic logic operations at the molecular level. The transition from simple logic gates to complex digital circuits requires the design of chemical systems able to process multiple inputs and outputs. We have identified a three-state molecular switch that responds to one chemical and two optical inputs producing two optical outputs. We have encoded binary digits in its inputs and outputs applying positive logic conventions and demonstrated that this chemical system converts three-digit input strings into two-digit output strings. The logic function executed by the three-state molecular switch is equivalent to that of a combinational logic circuit integrating two AND, two NOT, and one OR gate. The three states of the molecular switch are a colorless spiropyran, a purple trans-merocyanine, and its yellow-green protonated form. We have elucidated their structures by X-ray crystallography, (1)H NMR spectroscopy, COSY and NOE experiments, as well as density functional calculations. The three input stimulations controlling the interconversion of the three states of the molecular switch are ...Continue Reading

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Citations

May 20, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Erhan DenizFrançisco M Raymo
Jan 5, 2013·Nano Letters·Bala Krishna PathemPaul S Weiss
Mar 22, 2005·Chemical Society Reviews·Francisco M Raymo, Massimiliano Tomasulo
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