Chemosensor 1 shows three different responses towards Cu²⁺, acetate and Cu(OAc)₂ ion pair at different wavelengths independently in its absorption and fluorescence behaviour following a triple-signaling mechanism, namely, internal charge transfer (ICT), CN rotation and excited state intramolecular proton transfer (ESIPT). Chemosensor 1 shows a blue shift of the absorption band from 337 nm to 308 nm in the presence of Cu²⁺ ions (ICT). It exhibits a fluorescence ‘turn-off’ response at λ_em 458 nm in the presence of 1 equivalent of Cu²⁺ ions. The further addition of Cu²⁺ (6 equivalents) results in ∼24 times enhancement in the emission intensity at λ_em 427 nm, mimicking an ‘ON–OFF–ON’ molecular switch (ESIPT and CN rotation). The addition of acetate ions to a solution of 1 results in a red shift of the absorption band from 337 to 360 nm (ICT) and ∼4 times enhancement of the emission intensity at λ_em 458 nm (ESIPT). On the addition of a Cu(OAc)₂ ion pair, 1 shows the apparent effect of Cu²⁺ (blue shift, 337 to 308 nm) and acetate (red shift, 337 to 380 nm), which indicates the synergistic effect of both Cu²⁺ and AcO⁻ on each other's binding. The potential application of chemosensor 1 for the construction of INHIBIT (INH), IMPLICATION (IMP), AND, NOR, YES and NOT logic gates using Cu²⁺ and acetate as the inputs and absorbance/emission as the outputs is elaborated.