Primordial Molecular 1‐Bit Magnitude Comparator in Consort with Excitation‐Guided Mouldable Logic Systems: A Guided Design of Regular Interactions between Molecules

In addition to designing certain excitation modulated logic systems, we have created the first-ever genuine molecular 1-bit magnitude comparator, using acid and base guided varied absorption responses at separate channels. Designed and manufactured Bifunctional Bis(indolyl)methane Derivative (1) demonstrates distinct optical responses (in UV-visible and fluorescence mode) to a range of chemical stimuli (acid, base, Hg²⁺, Cu²⁺, EDTA, GSH, etc.) in aqueous medium. Intriguingly, the compound's excitation-modulated fluorescence responses appeared to change at different detection channels depending on whether the aforementioned analytes were present or not. We have proposed not only an excitation driven logic system with switchable molecular IMPLICATION and XNOR logic gates, but also a molecular 1-bit magnitude comparator in our proposal. A second excitation driven logic system with switchable molecular COMPLEMENT and NOR logic gates was also designed with two different optical channels and used Hg(II) & Cu(II) as chemical inputs.