Anthraimidazoledione-Terpyridine-Based Optical Chemosensor for Anions and Cations That Works As Molecular Half-Subtractor, Key-Pad Lock, and Memory Device

Abstract

We designed in this work a new family of anthraquinone and imidazole functionalized bifunctional terpyridine receptor, 2-(4-(2,6-di­(pyridine-4-yl)­phenyl)-1H-anthra­[1,2-d]­imidazole-6,11-dione (tpy-HPhImz-Anq) for recognition and sensing of selective anions and cations as well as for the construction of multifunctional logic devices. The terpyridine motif in the receptor was utilized for the cation coordination site and the imidazole moiety as the anion binding site. Both anion and cation recognition aspects of the receptor were thoroughly investigated in acetonitrile, mixed DMSO–water, as well as in solid media via different optical channels such as absorption, steady state, and time-resolved emission spectroscopic techniques. On the basis of the absorption and emission spectral responses toward a specific set of ionic inputs, this unique bifunctional receptor can mimic several advanced logic functions such as those of half-subtractor, key-pad lock, and memory device. We also report the implementation of the fuzzy logic approach to develop an infinite-valued logic system based on the luminescence dependence of the receptor upon concentration of different ionic inputs. In conjunction with the experimental investigation, density functional theory (DFT), and time-dependent density functional theory (TD-DFT), studies were carried out to investigate the structural and electronic properties of the receptor.

A ratiometric chemosensor for Al3+ based on naphthalene-quinoline conjugate with the resultant complex as secondary sensor for F−: Interpretation of molecular logic gates

“…Thus, from the above observation, a sequential logic circuit i.e. memory device which displays -write-read-erase-read‖ sequences in the form of binary logic function can be constructed [82].…”

Multifunctional Logic Applications of a Single Molecule: A Molecular Photo‐Switch Performing as Simple and Complex Gates, Memory Element, and a Molecular Keypad Lock

“…Now, for the purpose of manufacturing memory devices that are capable of storing information and information processing at the molecular level, the reversible and reproducible fluorescence switching process of CZ could be employed to design a useful sequential logic circuit displaying “Erase‐Read‐Write‐Read” behaviour in the form of binary logic. Memory devices operate through feedback loop where one of the outputs serves as input and is memorized as a “memory element” ,. Thus, based on the above principle we were able to design a sequential logic circuit displaying “Erase‐Read‐Write‐Read” with the help of binary logic employing on CZ as device (Figure ).…”

User Authorization at the Molecular Scale

“…The latter are macroscopic analytical devices that, similar to the way the olfactory system operates, can interact non‐specifically with a wide range of analytes and discriminate among them by creating a wide range of unique identification patterns . Hence, the main difference between 8 and the molecular keypad locks discussed before is that instead of generating a single digital output (0 or 1) for each code entry, it associates each password with a unique emission “signature” that enables it to authorize multiple users.…”