615-15-6Relevant articles and documents
Synthesis, structures, and luminescence of two 2-D microporous metal-organic frameworks in the zinc (cadmium)-dicarboxylate-imidazolate system
Guo, Xiaoqing,Wang, Miao,Gu, Xuefang,Zhu, Jinli,Tang, Yanfeng,Jiang, Guoqing,Bai, Junfeng
, p. 1819 - 1827 (2016)
Two 2-D microporous metal–organic frameworks, [Zn(BDC)(MbIm)]·2DMF (1) and [Cd3(BDC)3(MbIm)2(DMF)2]·2DMF (2), have been synthesized by solvothermal reaction of 1,4-benzenecarboxylic acid (H2BDC) and 2-methylbenzimidazole (MbIm) with zinc/cadmium nitrate. Single-crystal X-ray diffraction analysis indicates that 1 consists of the well-known zinc paddle-wheel motif which is linked by bridging dicarboxylates to form 2-D square grids. The 2-D layers stack offset due to the effect of the spatial structure of MbIm ligand and hydrogen-bonding interaction between MbIm and guest molecules. Similarly, 2 is constructed by six-connected Cd3(μ-O2CR)6(MbIm)2 units and bridging carboxylates, resulting in a 2-D layer structure with triangular grids. Topology analysis reveals that 1 exhibits a 2-D tetragonal plane network with {44·62} topology symbol, while 2 possesses a six-connected {36·46·53} topological network. Analysis of the luminescence spectra demonstrates that the complexes have good luminescent intensities with greater red-shift (82 nm for 1 and 69 nm for 2) corresponding to free MbIm. Elemental analyses, infrared spectra, powder X-ray diffraction, and thermogravimetric analyses of 1 and 2 have been investigated.
Synthesis, crystal structure, and thermal stability of [Mo 2O4(μ2-O)(C6H4O 2)2(H2O)]·(C8H 9N2)2·2H2O
Xu
, p. 48 - 53 (2014)
From hydrothermal treatment of benzene-1,2-diamine, pyrocatechol, and MoO3 in acetic acid solution, a new compound, [Mo2(μ 2-O)2(C6H4O2) 2(H2O)]·(C8H9N 2)2·2H2O (I), constructed from pyrocatechol chelated dinuclear molybdenum units and 2-methylbenzimidazole has been synthesized. Single-crystal structure analysis reveals that the compound crystallizes in the monoclinic space group P21/c with a = 23.365(2), b = 7.2214(5), c = 19.3021(16) β = 97.929(4), V = 3225.6(5), Z = 4, M = 808.46, ρc = 1.665 g/cm3, μ(MoK α) = 0.84 mm-1, F(000) = 1608, the final R = 0.0622 and wR = 0.1484 for 7385 independent reflections with R int = 0.0393. Interestingly, an in situ condensation between acetic acid and benzene-1,2-diamine has occurred, and the unexpected 2-methyl-1-H-benzo[d] imidazoles serve as counterions and N-H donors to form stable hydrogen-bond network in the crystal. Furthermore, intermolecular hydrogen bonds are found among the cations, anions and crystalline water molecules. The double nuclear molybdenum units are connected by O-H.O hydrogen bonds with the crystalline water molecules to form one-dimensional chains, and the chains are further joined together by N-H.O to form a quasi-two dimensional structure.
Electroanalytical and computational studies on the corrosion inhibition behavior of ethyl (2-methylbenzimidazolyl) acetate (EMBA) on mild steel in hydrochloric acid
Joseph, Abraham,Mohan, Revathi
, p. 4795 - 4823 (2015)
The interaction and corrosion protection properties of ethyl (2-methylbenzimidazolyl) acetate (EMBA) on mild steel in hydrochloric acid (0.5, 1 and 1.5 M) at different temperatures have been studied by polarization, EIS, adsorption, surface studies, and computational calculations. Polarization studies showed that this molecule act as mixed-type inhibitor. EMBA acts as an effective inhibitor for mild steel in hydrochloric acid at different temperatures (303, 308, and 313 K). At room temperature, EMBA was found to be a more effective inhibitor and its efficiency decreases with increasing temperature. The mechanism involves adsorption of inhibitor molecules on the metal surface and this process obeys the Langmuir isotherm.
Enhanced Catalytic Properties of Carbon supported Zirconia and Sulfated Zirconia for the Green Synthesis of Benzodiazepines
Godino-Ojer, Marina,Milla-Diez, Leticia,Matos, Inês,Durán-Valle, Carlos J.,Bernardo, Maria,Fonseca, Isabel M.,Pérez Mayoral, Elena
, p. 5215 - 5223 (2018)
This work reports for the first time a new series of promising porous catalytic carbon materials, functionalized with Lewis and Br?nsted acid sites useful in the green synthesis of 2,3-dihydro-1H-1,5-benzodiazepine – nitrogen heterocyclic compounds. Benzodiazepines and derivatives are fine chemicals exhibiting interesting therapeutic properties. Carbon materials have been barely investigated in the synthesis of this type of compounds. Two commercial carbon materials were selected exhibiting different textural properties: i) Norit RX3 (N) as microporous sample and ii) mesoporous xerogel (X), both used as supports of ZrO2 (Zr) and ZrO2/SO42? (SZr). The supported SZr led to higher conversion values and selectivities to the target benzodiazepine. Both chemical and textural properties influenced significantly the catalytic performance. Particularly relevant are the results concerning the non-sulfated samples, NZr and XZr, that were able to catalyze the reaction leading to the target benzodiazepine with high selectivity (up to 80 %; 2 h). These results indicated an important role of the carbon own surface functional groups, avoiding the use of H2SO4. Even very low amounts of SZr supported on carbon reveal high activity and selectivity. Therefore, the carbon materials herein reported can be considered an efficient and sustainable alternative bifunctional catalysts for the benzodiazepine synthesis.
Design, synthesis, and evaluation of different scaffold derivatives against NS2B-NS3 protease of dengue virus
Ganji, Lata R.,Gandhi, Lekha,Musturi, Venkataramana,Kanyalkar, Meena A.
, p. 285 - 301 (2020/11/19)
The number of deaths or critical health issues is a threat in the infection caused by Dengue virus, which complicates the situation, as only symptomatic treatment is the current solution. In this regard we have targeted the dengue protease NS2B-NS3 that is responsible for the replication. The series was designed with the help of molecular modeling approach using docking protocols. The series comprised of different scaffolds viz. cinnamic acid analogs (CA1–CA11), chalcone (C1–C10) and their molecular hybrids (Lik1–Lik10), analogs of benzimidazole (BZ1-BZ5), mercaptobenzimidazole (BS1-BS4), and phenylsulfanylmethylbenzimidazole (PS1-PS4). Virtual screening of various natural phytoconstituents was employed to determine the interactions of designed analogs with the residues of catalytic triad in the active site of NS2B-NS3. We have further synthesized the selected leads. The synthesized analogs were evaluated for the cytotoxicity and NS2B-NS3 protease inhibition activity and compared with known anti-dengue natural phytoconstituent quercetin as the standard. CA2, BZ1, and BS2 were found to be more potent and efficacious than the standard quercetin as evident from the protease inhibition assay.
Homology modelling, molecular dynamics simulation and docking evaluation of β-tubulin of Schistosoma mansoni
El-Shehabi, Fouad,Mansour, Basem,Bayoumi, Waleed A.,El Bialy, Serry A.,Elmorsy, Mohammad A.,Eisa, Hassan M.,Taman, Amira
, (2021/09/16)
Schistosomiasis is one of the neglected diseases causing considerable morbidity and mortality throughout the world. Microtubules with its main component, tubulin play a vital role in helminthes including schistosomes. Benzimidazoles represent potential drug candidates by binding β-tubulin. The study aimed to generate a homology model for the β-tubulin of S. mansoni using the crystal structure of O vis aries (Sheep) β-tubulin (PDB ID: 3N2G D) as a template, then different β-tubulin models were generated and two previously reported benzimidazole derivatives (NBTP-F and NBTP-OH) were docked to the generated models, the binding results indicated that both S. mansoni, S. haematobium were susceptible to the two NBTP derivatives. Additionally, three mutated versions of S. mansoni β-tubulin wild-type were generated and the mutation (F185Y) seems to slightly enhance the ligand binding. Dynamics simulation experiments showed S. haematobium β-tubulin is highly susceptible to the tested compounds; similar to S. mansoni, moreover, mutated models of S. mansoni β-tubulin altered its NBTPs susceptibility. Moreover, additional seven new benzimidazole derivatives were synthesized and tested by molecular docking on the generated model binding site of S. mansoni β-tubulin and were found to have good interaction inside the pocket.
