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The As 3 + directed selective Fluorimetric turn 'OFF' sensor based on dual functions of fluorophore-metal interaction and electron transfer between the emitter and light sensitizing moiety (PB-MOF) has been formulated. Intermolecular charge transfer dependent changes in emission intensity were recorded owing to the metal ion-induced modifications in coordinating potentials of PB-MOF. Fluorescein shows successive enhancement in emission maxima (λ em = 520 nm) due to intermolecular activation in the presence of AgNPs and PB-MOF. While interaction with As 3 + leads to non radiative energy transfer at λ em = 520 in methanol, and the action of As 3 + is selective over other ions