27147-03-1Relevant articles and documents
Synthesis, conformational and theoretical studies of 1,n-di(2-formyl-4-phenylazophenoxy)alkanes
Balachander,Manimekalai
, p. 70 - 78 (2016)
1,n-di(2-Formyl-4-phenylazophenoxy)alkanes 1 and 2 and 1,3-di(2-formyl-4-phenylazophenoxymethyl)benzene 3 were synthesis and characterized by FT-IR, UV-Vis, 1H, 13C NMR and mass spectral studies. The stable conformations of 1-3 were predicted theoretically and selected geometrical parameters were derived from optimized structures. The molecular parameters of HOMO-LUMO energies, polarizability, hyperpolarizability, natural bond orbital (NBO), atom in molecule (AIM) analysis and molecular electrostatic potential (MEP) surfaces were determined by the density functional theory (DFT) method and analysed.
Synthesis and anion recognition studies of novel bis (4-hydroxycoumarin) methane azo dyes
Panitsiri, Amorn,Tongkhan, Sukanya,Radchatawedchakoon, Widchaya,Sakee, Uthai
, p. 14 - 18 (2016)
Four new bis (4-hydroxycoumarin) methane azo dyes were synthesized by the condensation of 4-hydroxycoumarin with four different azo salicylaldehydes and their structures were characterized by FT-IR, 1H NMR, 13C NMR, HRMS. Anion bindi
Imidazole and azo-based schiff bases ligands as highly active antifungal and antioxidant components
Slassi, Siham,Fix-Tailler, Adeline,Larcher, Gérald,Amine, Amina,El-Ghayoury, Abdelkrim
, (2019)
We describe, herein, the synthesis, full characterization, and optical properties of four different ligands L1-L4 which associate an azo group, an imidazole unit, and a Schiff base fragment. The UV-visible absorption bands are characteristic of π → π and n → π transitions with an additional charge transfer between the azobenzene moiety and the imino group. Finally the determination of MIC80 values against pathogenic fungi such as S. apiospermum, A. fumigatus, and C. albicans revealed that these ligands have effective antifungal properties with highest activities (MIC80) on C. albicans for the azole based ligands L1-L3. DPPH radical scavenging of the studied ligands was also tested.
Mononuclear complexes based on pyrimidine ring azo schiff-base ligand: Synthesis, characterization, antioxidant, antibacterial, and thermal investigations
Gulcan, Mehmet,Oezdemir, Sadin,Duendar, Abdurrahman,Ispir, Esin,Kurtoglu, Muekerrem
, p. 1754 - 1762 (2014)
Six transition metal(II) complexes with the heterocyclic ligand HL (1), [CuL2]·H2O (2), [NiL2]·3H 2O (3), [CoL2]·3H2O (4), [MnL 2]·3H2O (5), [ZnL2]·2H 2O (6), [PdLOAc]·H2O (7) [HL = 5-benzoyl-1-((E)-(2- hydroxy-5-((E)-phenyldiazenyl)benzylidene)amino)-4-phenylpyrimidin-2(1H)-one] were synthesized. The features of the azo Schiff bases were assigned from microanalytical, spectroscopic (IR, UV/Vis., 1H- and 13C NMR, API-ES mass), magnetic, and molar conductivity measurements at room temperature as well as thermal analysis. The electronic absorption spectroscopy and magnetic susceptibility measurements of the complexes indicate square pyramidal arrangement for PdII and octahedral environment for all the other complexes. The azo Schiff base HL acts as a monobasic tridentate ligand, which commonly coordinates through the oxygen atoms of the phenol OH and the pyrimidine one group, and the nitrogen atom of the azomethine group. The thermal behaviors of the ligand and its metal complexes were studied using thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The metal complexes proved to be more thermally stable than the ligand; they decomposed at 10-30°C higher temperatures. Antioxidant properties of the ligand and its metal complexes (DPPH free radical scavenging, ferrous chelating and reducing power activities) were tested. Antimicrobial activities were studied with gram-positive bacteria, which included Bacillus subtilis and Staphylococcus aureus, whereas Escherichia coli and Pseudomonas aeruginosa represented gram negative bacteria. Copyright
Room Temperature Reversible Z→E Photoisomerization of Azobenzene Appended to Anthraquinone-Benzimidazole Based Photoswitches with Resolved n→π* Absorption Band
Phapale, Daulat,Kushwaha, Archana,Das, Dipanwita
, p. 5768 - 5776 (2019)
Light-triggered substituted azobenzene-based molecular switches are well known for their potential applications as molecular machines. The Z-isomer stability affected by heteroaromatic groups, extended aromaticity, different substituents, and varying the solvents based on their polarity. In this regards, five different anthraquinone/imidazole-based azobenzene derivatives have been synthesized with different electronic push/pull substituents. The detailed study of photoswitching processes with kinetic data was appraised by using UV/Vis and 1H-NMR spectroscopic techniques. The investigation of light-induced hydroxyl group conversion to quinone-hydrazone tautomerization has been observed during the isomerization. Most importantly, intermolecular hydrogen bonding interaction between tautomeric form and a higher polar solvent (DMSO) block the isomerization, but in a less polar solvent (DCM), light-induced trans ? cis isomerization takes place by tautomerization pathway with well-separated π→π* and n→π* transitions. Further, the detailed mechanistic study of solvent-assisted light-induced tautomerization with the role of hydrogen bonding and the following WRITE-READ-ERASE-READ system have been derived by using molecular logic gates.
Synthesis, spectroscopic investigation, anti-bacterial and antioxidant activites of some new azo-benzofuran derivatives
Mohamed, Shaaban K.,Hussein, Awaz J.,Ayoob, Mzgin M.,Hawaiz, Farouq E.,Samad, Mohammed K.,Hussain, Faiq H.S.
, p. 2617 - 2629 (2020/09/09)
This Article deals with the stepwise synthesis and spectroscopic characterization of some new azo benzofuran derivatives, started from the diazotization of substituted aniline coupled with 2-hydroxy benzaldehyde. On reacting of the azo of 2-hydroxy benzal
Novel edaravone-based azo dyes: Efficient synthesis, characterization, antibacterial activity, DFT calculations and comprehensive investigation of the solvent effect on the absorption spectra
Davasaz Rabbani, Mohammad Amin,Khalili, Behzad,Saeidian, Hamid
, p. 35729 - 35739 (2020/10/27)
The present study deals with designing and synthesizing novel dyes using the drug combination of edaravone and azo compounds which can be used as an indicator for anions and cations. The desired product synthesis was accomplished via a two-step process involving diazotizing the aromatic amines followed by the resultant salts coupling with edaravone. The resulting dyes were obtained with high yields under mild conditions. The structures of the dyes were identified with UV-vis, FT-IR, 1H NMR and 13C NMR spectra and CHN analysis. To investigate the solvatochromism effect, the interaction of different solvents with the selected dyes was evaluated using several parameters including the dielectric constant, refractive index, hydrogen bond donating ability, hydrogen bond accepting ability and dipolarity/polarizability scale. To achieve deep understanding about the stability and geometrical characteristics of the azo-hydrazo tautomers of the synthesized dyes and their UV-visible spectra prediction, some DFT calculations were also carried out on the synthesized dyes. The antibacterial activities of some synthesized compounds were also evaluated using the disk diffusion method. The results revealed different activity of the selected synthesized dyes for antibacterial tests against selected Gram positive and Gram negative bacteria.
