Dual macro-cyclic component based logic diversity

Abstract

In continuation of our recent studies on the photophysics of a photodynamic therapeutic agent, harmine (HM) in model membrane, the present contribution highlights a new model to design multiple logic circuits, a memory device and a molecular lock regulated by dual macrocyclic components as chemical inputs. The unique reversible photoswitching regulated by macrocyclic components plays decisive role in the manifestation of the final outputs for the logic functions. Inspired by this phenomenon, herein, we are reporting the use of a photosensitizer molecule for designing of various logic circuits at molecular level with the intention to escalate the next generation molecular logic arena. For these desired outsets, fluorescence spectroscopic changes of HM upon addition of macrocyclic components (CTAB and β-CD) were utilised. Beyond the simple single input single output logic gates (NOT, YES, PASS 0 and PASS 1), we were also able to design IMPLICATION and INHIBIT gates. In addition to different logic functions, the modulations of the optical responses of HM driven by the macrocyclic components were employed to design “Erase-Read-Write-Read” and “Write-Read-Erase-Read” type memory units. Moreover, considering the optical responses of HM we proposed a supramolecular keypad lock operated through unique sequential entry of opto-chemical passwords.