66385-95-3Relevant academic research and scientific papers
Luminescent coatings: White-color luminescence from a simple and single chromophore with high anticorrosion efficiency
Younis, Osama,El-Katori, Emad E.,Hassanien, Reda,Abousalem, Ashraf S.,Tsutsumi, Osamu
, (2020)
Luminescent coatings have potential commercial applications. Here, the photoluminescence, thermal, and corrosion inhibition properties of reported Schiff bases have been studied. Moreover, quantum chemical calculations have been done to realize the working mechanism of their properties. Interestingly, we succeeded to get a single-chromophore white-color emission from a small Schiff base molecule through a simple technique, where the relative emission intensities at the long and short wavelengths of the visible range were controlled by introducing electron-donating or withdrawing groups. Furthermore, the compounds were found thermally stable and can emit efficiently until 124 °C. Also, the electrochemical impedance spectroscopy, electrochemical frequency modulation, Tafel polarization, and surface characterizations have been investigated. The studied compounds showed high inhibition efficiencies (ex. 93%) and played a great role in retarding the stainless-steel corrosion in 2 M H2SO4. These measurements confirmed that the existence of these Schiff bases can reduce the double-layer capacities, corrosion current densities, and corrosion rate simultaneously with increasing the charge transfer resistance values. The studied materials as luminescent coatings may be employed for mixed-type inhibitors and can provide a strategy for the development of new organic materials capable of producing white-color emission from a simple and single molecule.
Bioactivity of azomethines derived mechanochemically from 2-amino pyridine and studies on the effect of substituents on the reaction
Sarma, Madhushree Das,Ghosh, Subhojit
, p. 1295 - 1303 (2020/12/04)
Azomethines with pyridine framework serve as excellent pharmacophore. A number of azomethine derivatives were synthesised from 2-aminopyridine and differently substituted aromatic aldehydes in excellent to almost quantitative yields through green, mechanochemical protocol. Influence of the substituents in the nuclei of aromatic aldehydes on the rate of the reaction was investigated. Presence of ortho hydroxy groups in the nucleus of aromatic aldehydes led to the completion of the reactions in almost no time with nearly quantitative yields. 2,2'-diphenyl-1-picrylhydrazyl (DPPH) radical was used to evaluate the in vitro antioxidant activity of the prepared azomethines and the results were compared with standard natural antioxidant L-ascorbic acid. Most of the derivatives showed fairly strong antioxidant property. Antibacterial activity of the prepared azomethines were examined against Bacillus subtilis (Gram-positive) and Escherichia coli (Gram-negative) strains by using agar well diffusion method. Some of the azomethines exhibited encouraging antibacterial activities.
Copper(II)-Mediated Aerobic Synthesis of Imidazo[1,2-a]pyridines via Cascade Aminomethylation/Cycloisomerization of Alkynes
Rassokhina, Irina V.,Shirinian, Valerii Z.,Zavarzin, Igor V.,Gevorgyan, Vladimir,Volkova, Yulia A.
, p. 11212 - 11218 (2015/11/18)
A single copper(II)-catalyzed three-component cascade aminomethylation/cycloisomerization of propiolates to form imidazo[1,2-a]pyridines was explored. A straightforward method was developed for the practical synthesis of functionalized imidazo[1,2-a]pyridines from benzaldehydes, 2-aminopyridines, and propiolate derivatives catalyzed by Cu(OAc)2 hydrate in the presence of air. The protocol is marked by excellent yields, functional group tolerance, and, above all, adaptability to synthesize imidazo[1,2-a]pyridine-based drug molecules such as Alpidem.
Ultrasonics promoted synthesis of thiazolidinones from 2-aminopyridine and 2-picolilamine
Gouvêa, Daniela P.,Bare?o, Valéria D.O.,Bosenbecker, Juliano,Drawanz, Bruna B.,Neuenfeldt, Patrícia D.,Siqueira, Geonir M.,Cunico, Wilson
experimental part, p. 1127 - 1131 (2012/08/08)
The efficient multicomponent synthesis of thiazolidinones from the reaction of arenealdehydes, mercaptoacetic acid and 2-picolilamine or 2-aminopyridine under ultrasound irradiation are reported. The reaction with 2-aminopyridine needs a Lewis acid cataly
