Light and Cation-Driven Optical Switch based on a Stilbene-Appended Terpyridine System for the Design of Molecular-Scale Logic Devices

Abstract

A molecular system comprising a terpyridine moiety capable of coordinating with different cations and a photoswitchable stilbene unit has been utilized here for the fabrication of multiply configurable logic systems. Incorporation of a substituted stilbene unit into the terpyridine motif generates an intraligand charge-transfer-sensitive module whose absorption and emission spectral properties are highly sensitive to light as well as cations. On the basis of the optical response profile of the receptor in the presence of selected cations as well as light of a specific wavelength, we are able to demonstrate multiple Boolean logic functions such as INHIBIT, IMPLICATION, OR, NOR, and NAND, as well as various combinations of them. Of particular interest, we utilized the present system for the construction of security keypad locks and memory devices by maintaining a proper sequence of the stimuli and monitoring either absorption or emission spectral response at a specific wavelength as the output signal. In addition to various Boolean logic functions, the present system has also the ability to mimic fuzzy logic operations for generating an infinite-valued logic scheme depending on its emission spectral responses upon varying the concentration of cationic (Fe2+ and/or Zn2+) and anionic (CN–) inputs.

Neuro-Fuzzification Architecture for Modeling of Electrochemical Ion-Sensing Data of Imidazole-Dicarboxylate-Based Ru(II)–Bipyridine Complex

“… , The motivation of choosing Ru­(II)–polyheterocyclic complex is because of its very rich and tunable photophysical and electrochemical behaviors which in turn give rise to the construction of potential molecular switches and devices in the presence of suitable external stimuli such as light, anions, cations, acid, and base. − The absorption, emission, and electrochemical behavior of the metalloreceptor is significantly modulated upon the influence of basic anions (such as F – , AcO – , and H 2 PO 4 – ) as well as by changing the pH. − Interestingly, the deprotonation of the metalloreceptor by selected anions or by alkaline pH, followed by its restoration to its original form by acid or acidic pH is reversible and could be repeated many times. The metalloreceptor is capable to demonstrate several advanced BL functions through the use of its spectral and electrochemical responses upon the influence of anions, acid, and solution of appropriate pH. − The beauty of the present system is the use of its electrochemical responses (cyclic and square-wave voltammetric signals) compared with the absorption and emission spectral responses of our previously reported receptors.…”

“…The operation of a BL banks on the spreading of the output at the two extremes, either “0” or “1”. − Most of the real systems, on the other hand, are composed of several in-between states. To address the intervening conditions, FL is expected to be a potential choice.…”

Analysis and prediction of anion- and temperature responsive behaviours of luminescent Ru(ii)-terpyridine complexes by using Boolean, fuzzy logic, artificial neural network and adapted neuro fuzzy inference models

“…In BL, the output signal varies between two extremes, "0" or "1". [52][53][54][55][56][57][58][59][60][61][62][63] But the practical systems often consist of innumerable intermediate states. To address the in-between states, the FL is an appropriate choice.…”

Fuzzy Logic, Artificial Neural Network, and Adaptive Neuro-Fuzzy Inference Methodology for Soft Computation and Modeling of Ion Sensing Data of a Terpyridyl-Imidazole Based Bifunctional Receptor

“…In this work, we have utilized our previously reported terpyridyl-imidazole system (tpy-HImzPh 3 ) ( Bhaumik et al, 2011 ), wherein a terpyridine moiety capable of coordinating with several bivalent 3d metals is covalently coupled with a triphenyl-imidazole motif capable of interacting with selected anions ( Chart 1 ) ( Bhaumik et al, 2011 ; Karmakar et al, 2014 ; Mondal et al, 2017 ; Karmakar et al, 2015a ; Mukherjee et al, 2021 ). Using its absorption and emission spectral responses as a function of a specific set of cations and anions, multiple Boolean logic (BL) functions such as combinatorial logic of AND, OR, and NOT gates ( Omana et al, 2003 ; Zhang et al, 2015 ; Magri and Spiteri, 2017 ; Goldsworthy et al, 2018 ) and molecular level keypad lock are demonstrated ( Margulies et al, 2007 ; Strack et al, 2008 ; Andrasson et al, 2009 ; Kumar et al, 2009 ; Bhalla and Kumar, 2012 ; Zou et al, 2012 ; Jiang and Ng, 2014 ; Carvalho et al, 2015 ; Chen et al, 2015 ; Karmakar et al, 2015b ; Mondal et al, 2015 ).…”