3878-18-0Relevant articles and documents
-
El'chaninov,M.M. et al.
, (1979)
-
Experimental and theoretical studies of imidazole based chemosensor for Palladium and their biological applications
Suresh, Shanmugam,Bhuvanesh, Nanjan,Raman, Arunachalam,Sugumar, Paramasivam,Padmanabhan, Dhanasekaran,Easwaramoorthi, Shanmugam,Ponnuswamy, Mondikalipudur Nanjappagounder,Kavitha, Subbiah,Nandhakumar, Raju
, (2019)
An imidazole derivative (probe L1) bearing a thiophene group was developed as an ON-OFF fluorescent chemosensor for palladium ions. The UV–vis absorption and fluorescence spectral behavior of probe L1 towards various cations were investigated in HEPES buffer aqueous solution. The absorbance intensity of probe L1 considerably enhanced whereas the fluorescence emission intensity was quenched in the presence of Pd2+ ions, while the presence of other metal ions had no notable interference. The stoichiometry of the complex was determined using Job's plot and a plausible recognition mechanism of probe L1 and Pd2+ is proposed. Density Functional Theory (DFT) calculations were used to study the electronic properties and to optimize the structure on the selectivity of Pd2+ ions and are correlated with the experimental results. The intracellular Pd2+ ion detection in living cells was performed using probe L1 on brine shrimp nauplii (Artemia salina) up to 20 μg/mL.
FT-IR, dispersive Raman, NMR, DFT and antimicrobial activity studies on 2-(Thiophen-2-yl)-1H-benzo[d]imidazole
ünal, Arslan,Eren, Bilge
, p. 129 - 136 (2013)
2-(Thiophen-2-yl)-1H-benzo[d]imidazole (TBI) was synthesized under microwave conditions and was characterized by FT-IR, dispersive Raman, 1H-, 13C-, DEPT-, HETCOR-NMR spectroscopies and density functional theory (DFT) computations. The FT-IR and dispersive Raman spectra of TBI were recorded in the regions 4000-400 cm1 and 4000-100 cm 1. The experimental vibrational spectra were interpreted with the help of normal coordinate analysis based on DFT/B3LYP/6-311++G(d, p) theory level for the more stable tautomeric form (Tautomer 1). The complete vibrational assignments were performed on the basis of the potential energy distribution (PED) of the vibrational modes, calculated with scaled quantum mechanical (SQM) method. A satisfactory consistency between the experimental and theoretical findings was obtained. The frontier molecular orbitals (FMOs), atomic charges and NMR shifts of the two stable tautomeric forms were also obtained at the same theory level without any symmetry restrictions. In addition, the title compound was screened for its antimicrobial activity and was found to be exhibit antifungal and antibacterial effects.
Non-metal-mediated: N -oxyl radical (TEMPO)-induced acceptorless dehydrogenation of N-heterocycles via electrocatalysis
Hou, Huiqing,Ke, Fang,Lin, Mei,Ma, Xinhua,Shi, Sunjie,Sun, Weiming,Wu, Mei,Ye, Yaling,Zheng, Wenhe
, p. 5483 - 5488 (2022/03/01)
The development of protocols for direct catalytic acceptorless dehydrogenation of N-heterocycles with metal-free catalysts holds the key to difficulties in green and sustainable chemistry. Herein, an N-oxyl radical (TEMPO) acting as an oxidant in combination with electrochemistry is used as a synthesis system under neutral conditions to produce N-heterocycles such as benzimidazole and quinazolinone. The key feature of this protocol is the utilization of the TEMPO system as an inexpensive and easy to handle radical surrogate that can effectively promote the dehydrogenation reaction. Mechanistic studies also suggest that oxidative TEMPOs redox catalytic cycle participates in the dehydrogenation of 2,3-dihydro heteroarenes. This journal is
A one-step synthesis of substituted benzo- and pyridine-fused 1H-imidazoles
Kumar, Sonu,Sarmah, Manash P.,Reddy, Yella,Bhatt, Ashish,Kant, Ravi
, p. 96 - 105 (2021/11/23)
Substituted benzimidazoles and pyrimidazoles are an important group of heterocyclic aromatic organic compounds in the field of medicinal chemistry. A one-step microwave accelerated synthesis of substituted benzo- and pyridine-fused 1H-imidazoles has been described. Mechanistically, the reaction proceeds by reacting substituted 2-fluoronitrobenzene and substituted arylamine through the formation of N-hydroxy intermediate, which at higher temperature cleaves to afford the desired product. This approach achieved reductions in reaction times, higher yields, cleaner reactions than the previously described synthetic processes.
