The recently-discovered ability of small logical molecules to recognize edges is exploited to achieve outline drawing from binary templates. Outlines of arbitrary curvature, several colours and thicknesses down to 1 mm are drawn in around 30 min or less by employing a common laboratory two-colour ultraviolet lamp. The outlines and the light dose-driven XOR logic with fluorescence output or ‘off-on-off’ action which is observed in the irradiated regions are modelled by combining foundational principles of photochemistry, acid-base neutralization and diffusion.
Ling, J., Naren, G., Kelly, J., Fox, D. B., & de Silva, A. P. (2015). Small molecular logic systems can draw the outlines of objects via edge visualization. Chemical Science, 6(8), 4472-4478. https://doi.org/10.1039/c5sc01537e