Efficient Deep-Blue Emittier and Molecular-Scale Memory Device Based on Dipyridyl–Phenylimidazole–Terpyridine Assembly

Abstract

In this paper we have utilized a heteroditopic polypyridyl− imidazole system 4′-[4-(4,5-dipyridin-2-yl-1H-imidazol-2-yl)-phenyl]-[2,2′;6′,2″]terpyridine (tpy-Hbzim-dipy), wherein the terpyridine moiety has been utilized as the cation binding site and the imidazole motif as the anion binding site. This system is an efficient deep-blue emitter in chloroform with Commission Internationale de L'Eclairage (CIE) coordinates of 0.14 and 0.06. On the basis of the response profiles in terms of absorption or emission intensity and wavelength toward selected anions and cations, we developed a molecular system which can mimic sequential Boolean logic functions capable of integrating into a "Writing−Reading−Erasing−Reading" combinational circuit. In this work, we also examined the effect of selective anions and cations on the optical properties of the receptor by means of computational (DFT and TD-DFT) studies.

Polypyridyl-imidazole based smart Ru(II) complex mimicking advanced Boolean and Fuzzy logic functions

“…(1) IF n F À /n 1 AND n Zn 2þ /n 1 are null, THEN quantum yield (U F ) is medium (2) IF n F À /n 1 is low AND n Zn 2þ /n 1 is low, THEN quantum yield (U F ) is medium (3) IF n F À /n 1 is low AND n Zn 2þ /n 1 is medium, THEN quantum yield (U F ) is medium (4) IF n F À /n 1 is low AND n Zn 2þ /n 1 is high, THEN quantum yield (U F ) is high (5) IF n F À /n 1 is medium AND n Zn 2þ /n 1 is low, THEN quantum yield (U F ) is medium (6) IF n F À /n 1 is medium AND n Zn 2þ /n 1 is medium, THEN quantum yield (U F ) is medium (7) IF n F À /n 1 is medium AND n Zn 2þ /n 1 is high, THEN quantum yield (U F ) is high (8) IF n F À /n 1 is high AND n Zn 2þ /n 1 is low, THEN quantum yield (U F ) is low (9) IF n F À /n 1 is high AND n Zn 2þ /n 1 is medium, THEN quantum yield (U F ) medium (10) IF n F À /n 1 is high AND n Zn 2þ /n 1 is high, THEN quantum yield (U F ) is high Fig. 13.…”

“…IF n Fe 2þ /n 1 is low AND n F À /n 1 is high, e is low is low (6) IF n Fe 2þ /n 1 is medium AND n F À /n 1 is low, THEN e is medium (7) IF n Fe 2þ /n 1 is medium AND n F À /n 1 is medium, THEN e is medium (8) IF n Fe 2þ /n 1 is medium AND n F À /n 1 is high, THEN e is low (9) IF n Fe 2þ /n 1 is high AND n F À /n 1 is low, THEN e is high (10) IF n Fe 2þ /n 1 is high AND n F À /n 1 is medium, THEN e is medium (11) IF n Fe 2þ /n 1 is high AND n F À /n 1 is high, THEN e is low induced by combinations of multiple inputs are of great recent interest. To this end, we monitored the emission intensity at 622 nm as the output signal in presence of four ionic inputs (Fe 2+ as input 1, Ni 2+ as input 2, Cu 2+ as input 3 and H + as input 4).…”

“…Several molecular systems mimicking different gates performing Boolean logic operations and responding to a large variety of activating input signals (e.g., light, electrical, magnetic, and chemical) were developed in the past two decade [1][2][3][4][5]. In contrast to mimicking the functions of basic logic gates as well as their simple combinations, the molecular systems capable of demonstrating sequential logic operations as required in circuits, molecular keypad locks [28][29][30], and memory devices are relative few in the literature [8,[31][32][33][34]. Moreover, there is huge scarcity of coordination complex-based molecular systems with versatile geometry and excellent optoelectronic properties compared with their organic counterparts in exhibiting sequential advanced logic functions [35][36][37].…”

Packing directed beneficial role of 3-D rigid alicyclic arms on the templated molecular aggregation problem

“…UV-vis and uorescence spectra were recorded on a Shimadzu UV-2450 and a Cary Eclipse Fluorescence Spectrophotometer (Agilent Technologies) respectively. 1 H and 13 C NMR spectra were recorded on a Jeol ECX 500 MHz NMR spectrometer. TMS was used as internal standard for 1 H NMR characterization.…”

An imidazolyl-pyreno-imidazole conjugate as a cyanide sensor and a set–reset memorized sequential logic device

“…[18][19][20][21][22][23] The chemodosimetric strategy involving the coordination of cyanide ion to (i) a transition metal ion, [24][25][26][27][28][29][30][31] (ii) coordinately unsaturated boron atom [32][33][34] , or (iii) an electron deficient carbonyl groups 31a,34c,35-38 is emerged as an efficient alternative method for detecting cyanide ion in water. 42,74,[76][77][78][79][80][81][82][83][84] In this paper, theoretical understanding of the electronic structures and spectroscopic properties of the receptor, its imidazole NH deprotonated form and selected metal complexes will also be carried out using density functional theory (DFT) and time-dependent density functional theory (TD-DFT). On the other hand, a few receptors that are capable of recognizing cyanide ion in water through hydrogen bond interactions suffer from the lack of selectivity and also the detection limit in most cases is still higher than the permissible level (0.2 ppm) for drinking water as recommended by Environment Protection Agency (EPA).…”