Molecular Half-subtractor Research Articles

Molecular half-subtractor and memory device based on a new Schiff-based colorimetric sensor for anions detection and computational studies

A new multi-analyte chromogenic sensor (L) for rapid detection of CN– and HSO4− was synthesized by reacting azo dye with furfurylamine (1: 1). The sensing ability of the L was investigated towards different anions by visual test, and UV–Vis spectroscopy in CH3CN: H2O (4: 1, v/v) media. The Job’s plot and HRMS data confirmed that the CN– and HSO4− ions bind with L in 2: 1, and 1: 1 stoichiometric ratio, respectively. The binding constants (Ka) and LOD values for CN–, and HSO4− were determined 4.45 × 10+4 M−1; 1.71 µM, and 3.67 × 10+5 M−1; 0.22 µM, respectively. Furthermore, DFT calculations supported the binding framework between L and the said anions. In addition, L was used to successfully detect CN– in peach kernel samples in aqueous media and as a colorimetric test strip for HSO4−. The UV–Vis absorption bands offer the possibility for fabrication of complex logic circuits such as complementary IMP/INH logic circuits, half subtractor and ‘set- reset’ flip flop memory elements.

Colorimetric sensor for the detection of H2S and its application in molecular half-subtractor

Azine based new colorimetric sensor 1 for the detection of gasotransmitter H2S has been reported. Sensor 1 used to detect the H2S with a remarkable red shift of 105 nm in the absorption spectra with a colour change from light yellow to brown red. Importantly, rare example of azine derivative has been used as a colorimetric probe for H2S detection using deprotonation mechanism. H2S induced deprotonation of one of the -OH proton followed by a change in resonance of 1 is responsible for the ratiometric spectral and colour change. The detection response was quick and the LOD calculated as 18.2 μM. Sensor 1 was also explored in the detection of H2S in biological fluids such as human serum and mouse serum. Moreover, for the first time, we have shown the applicability of H2S for the construction of half subtractor molecular logic gate.

PH controllable photocurrent switching and molecular half-subtractor calculations based on a monolayer composite film of a dinuclear RuII complex and graphene oxide

A monolayer film composed of graphene oxide and a dinuclear Ru(ii) complex, acts as multiple logic gates performing half-subtractor molecular computations by using pH and potential as inputs and photocurrent as output.

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

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 t...

A molecular half-subtractor with Zn 2+ and UV-light as inputs

The salen-type Schiff base (2,2′-bis(2-hydroxybenzylideneamino)-1,1′-binaphthyl ( BHB)) has been synthesized and characterized. Exhibiting absorption and fluorescence changes in the presence of Zn 2+ in chloroform and ethanol mixed solution, BHB could be used as a fluorescent chemosensor for the detection of Zn 2+. Furthermore, by monitoring the fluorescence and absorbance as output signals, BHB can function as a combinatorial logic circuit for a molecular half-subtractor with Zn 2+ and UV irradiation as input variables.

A molecular half-subtractor based on a fluorescence and absorption dual-modal sensor for copper ions

A l-phenyl alanine derivative ( L) could be used as a fluorescence and absorption dual-modal sensor, which was highly sensitive and selective to copper ion at physiological pH. We have drawn attention to the use of its copper complex to acquire a half-subtractor with parallel operating INHIBIT and XOR logic gates, by monitoring, fluorescence and absorbance as output signals, respectively.

A metallo-supramolecular approach to a half-subtractor

The tetraamine dinucleating ligand L, which bears naphthalene moieties at both ends, behaves as a combinatorial logic circuit for a molecular half-subtractor in the presence of ZnII ions.

Molecular half-subtractor based on 3,3′-bis(1H-benzimidazolyl-2-yl)[1,1′]binaphthalenyl-2,2′-diol

Title fluorophore (1) possessing 2,2′-binaphthol and benzimidazole moieties has been investigated for elaboration of half-subtractor logic operation. For comparison differently substituted systems have been studied. Fluorophore 1 showed strong fluorescence at 585 nm due to ESIPT phenomena which was completely quenched on addition of HClO4 with concomitant appearance of a new emission band at 435 nm with hypsochromic shift of 150 nm. The addition of TBAOH to the solution of 1 gave a new hypsochromically shifted emission band at 515 nm (Δλ = 70 nm) with concomitant quenching at 585 nm. Thus, fluorophore 1 with large differentials of emission maxima under neutral, acidic and basic conditions provides four opportunities for arithmetic operation half-subtractor. i.e. with 435/515 nm (INHIBIT) and 475 nm (XOR) gates and with 435/515 nm (INHIBIT) and 585 nm (XNOR) gates which have been elaborated as combinatorial logic circuits for a molecular half-subtractor with acid and base as input variables. The elaboration of half-subtractor with only XOR logic in the case of fluorophore 2 possessing a molecular structure half that of fluorophore 1 and complete lack of logic gates in fluorophore 5 with change in position of benzimidazole moiety further signify the importance of the structural architecture in fluorophore 1.

2,2‘-Bipyridyl]-3,3‘-diol as a Molecular Half-Subtractor

[structure/diagram: see text] Spectral responses at two different wavelengths revealed that BP(OH)2 ([2,2'-bipyridyl]-3,3'-diol) can function as a combinatorial logic circuit for a molecular half-subtractor with acid and base as input variables.

Molecular Logic: A Half-Subtractor Based on Tetraphenylporphyrin

Spectroscopic changes from a solution of the amphophile 5,10,15,20-tetraphenylporphyrin in N,N-dimethylformamide using inputs of acid (HClaq) and base (KOBut) are interpreted as XOR and INHIBIT logic operations. The combination of these two operations gives rise to a device that acts as a molecular half-subtractor.