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The general tool of fluorescent PET (photoinduced electron transfer) sensors/switches – a molecular design principle with engineering features – is outlined, with the aid of frontier orbital energy diagrams. Fluorophores such as anthracene, 1,3‐diaryl‐Δ2‐pyrazolines and 4‐amino‐1,8‐naphthalimides are employed within this system, alongside receptors such as amines, carboxylates, crown ethers and amino acids. This tool appealed to a multinational corporation for building a medical analyzer for electrolytes such as Na+, K+, Ca2+ and gases like CO2, which became a commercially successful application. Finally, the tool was a springboard for chemistry to cross into computer science. The field of molecular logic can elucidate how molecules inside us handle information. Molecular examples of the simplest logic gates such as YES, NOT, OR, AND are described. A case of a human‐level computation – visual edge detection – is also included. [ABSTRACT FROM AUTHOR]

Fluorescent PET sensors, fluorescent PET switches, molecular logic, photoinduced electron transfer (PET), supramolecular chemistry Keywords: fluorescent PET sensors; fluorescent PET switches; molecular logic; photoinduced electron transfer (PET); supramolecular chemistry EN fluorescent PET sensors fluorescent PET switches molecular logic photoinduced electron transfer (PET) supramolecular chemistry 1 1 1 04/27/23 20230401 NES 230401 B The cover feature image shows b chemical species (in gold) rushing in to bind with receptors (in green) so that light signals of associated fluorophores (in blue) are switched from "off" to "on". [Extracted from the article]

An interview with A. Prasanna de Silva, professor at the Queen's University in Belfast, Northern Island, is presented. He talks about his specialization in the field of supramolecular chemistry. He comments on fluorescent molecular sensors which can gather information about atomic or molecular behavior from environments of nanometer dimensions.