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61.
Pamidipati Gayatri Hela Ramireddy Nageswara Reddy Nageswara Rao Anipindi K. Indira Priyadarsini Tulsi Mukherji 《Reaction Kinetics and Catalysis Letters》2005,85(1):79-87
Summary Pulse radiolysis studies indicated that OH· and eaq- formed adducts with 2,4,6-tripyridyl-1,3,5-s-triazine (tptz). The OH-adduct showed an absorption maximum at 290 nm, while the adduct formed from the attack of eaq- and subsequent protonation of the anion, has an absorption maximum at 300 nm. In case of the complex, Fe(tptz)22+, both OH· and eaq- gave ligand centered adducts. All the adducts decayed by second order dimerization or disproportionation, a disproportionation reaction in case of the complex. 相似文献
62.
Wireless Personal Communications - Cooperative communication utilizes node cooperation for enhancing the diversity gains during secure communication against eavesdropping and jamming which are the... 相似文献
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64.
Nilofar Baral Deepak Ranjan Mishra Nilima Priyadarsini Mishra Seetaram Mohapatra Bishnu Prasad Raiguru Pravati Panda Sabita Nayak Mukesh Nayak P. Sudhir Kumar 《Journal of heterocyclic chemistry》2020,57(2):575-589
The current study aimed to identify a new strategy of FeCl3 catalyzed multicomponent synthesis of substituted 2H-chromene–fused pyrrole derivatives. A series of chromene-based pyrrole prepared by employing an array of 3-nitro-2H-chromenes, aniline, and acetylacetone in toluene under microwave irradiation. Using FeCl3 as a prompt catalyst and microwave irradiation to synthesize 2H-chromene–fused pyrrole motifs significantly reduces the reaction time and facilitates to high yields (83%-95%). Structure of all synthesized compounds analyzed by spectroscopic analysis. One-pot reaction, short reaction period, and simple experimental procedure are the fascinating properties associated with this protocol. The in vitro antibacterial activity of the entire series was assessed against Staphylococcus aureus and Escherichia coli. Out of all the compounds, 15b and 15h revealed most excellent potency against both the bacterial strains relative to the reference gentamicin. Docking study was employed to determine the possible binding orientation of DNA gyrase with the active sites of chromene-fused pyrrole analog. The docking results show that compounds 15b and 15h have higher binding affinity with energy −8.00 and −8.80 kcal/mol. These results illuminate the mode of binding progression and provide an esteemed pathway for the design and the structural modification of chromene-fused pyrroles as a newly advanced class of antibacterial agent. 相似文献
65.
Organic catalysts have found wide applications in organic synthesis. Many organic reactions, which originally do not occur under normal conditions or are difficult to operate normally, have been successfully conducted under mild conditions in the presence of catalysts. In recent years, 2,4,6-trichloro-1,3,5-triazine (TCT, cyanuric chloride) has been used as organic catalyst in many organic synthesis, because it is stable, nonvolatile, inexpensive, commercially available, and easy to handle. On account of these properties it has been used as a green catalyst and sometimes is a catalyst of choice in organic reactions. 相似文献
66.
A series of organotin(IV) complexes of type R2SnLCl [R = Ph, Bu, Et, Me] were prepared by reaction of diorganotindichloride(IV) with Schiff base ligands, L1 = (1-[(6-ethoxy-benzothiazol-2-ylimino)-methyl]-naphthalen-2-ol), L2 = (1-[(6-nitro-benzothiazol-2-ylimino)-methyl]-naphthalen-2-ol), L3 = (1-[(6-methoxy-benzothiazol-2-ylimino)-methyl]-naphthalen-2-ol) and L4 = (1-[(6-methyl-benzothiazol-2-ylimino)-methyl]-naphthalen-2-ol) obtained from 2-amino-6-substituted benzothiazole derivatives with 2-hydroxy-1-naphthaldehyde in 1:1 molar ratio. These organotin(IV) complexes were characterized by various spectroscopic techniques (1H, 13C and 119Sn NMR, FT-IR), and physical techniques (X-ray powder diffraction analysis and elemental analysis). The coordination of the prepared complexes has been planned as pentacoordinated around the central tin atom during which ligands coordinated to tin atom in bidentate manner acted as N, O donor system. The ligands and their complexes were screened for antibacterial and antifungal activities against Gram-positive bacteria Bacillus cereus (MTCC 10072), Staphylococcus aureus (NCIM 2901), Gram-negative bacteria Escherichia coli (MTCC 732), Pseudomonas aeruginosa (MTCC 424) and fungi Aspergillus niger (MTCC 9933) and Aspergillus flavus (ATCC 76801). The output of QSAR analysis indicated that topological parameters (molecular connectivity indices) were responsible for controlling the antimicrobial activity of the synthesized compounds. 相似文献
67.
Sonika Meenakshi Rajesh Malhotra 《Phosphorus, sulfur, and silicon and the related elements》2013,188(9):1875-1885
Ligational behavior of thiosemicarbazones and semicarbazones derived from 1-phenyl-3-arylpyrazole-4-carboxaldehydes towards triphenylchlorosilane has been investigated by elemental analysis, molar conductivity measurements, and IR, 1H, 13C, and 29Si NMR spectroscopic studies. The ligands and their organosilicon complexes have also been evaluated for in vitro antimicrobial activity against some pathogenic bacteria and fungi. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file. 相似文献
68.
The pulse radiolysis technique has been employed to study the reaction of ·OH radical with tryptophanol (TPN). Reactions of specific one-electron oxidants like Br2· - and N3· and ·H atom were carried out to understand the contribution of different channels of · OH radical reaction with TPN. The studies were carried out in the pH range 3 to 10. One-electron oxidation of TPN (pH 3) produced radical cation absorbing at 570 nm. However, at higher pH, deprotonation of TPN cation radical takes place from N(1) position and indolyl radical absorbing at 520 nm with a p
K
a value of 3.6 is formed. Redox titration with TMPD, ABTS2- and MV2+ was performed to determine the total yield of oxidizing and reducing radicals produced during ·OH reaction. 相似文献
69.
Munesh Chandra Adhikary M. H. Priyadarsini Sanjit Kumar Rath Chapal Kumar Das 《Journal of nanoparticle research》2017,19(9):314
In recent years, supercapacitors have been considered as one of the auspicious energy storage devices. In this work, two different kinds of mixed metal oxide NiMoO4 nanoflakes arrays were directly grown on 3D Ni foam. The electrode exhibited high specific capacitance of 2004 F/g at the current density of 2 A/g in 6 M KOH electrolyte. Additionally, it also exhibited low equivalent series resistance of 0.62 Ω and excellent cycling stability (80% capacitance retention after 1000 cycles). With these extraordinary electrochemical properties, the electrode material can be considered as potential candidate for supercapacitor applications. 相似文献
70.
P. Gaikwad G. H. Naik K. I. Priyadarsini B. S. M. Rao 《Journal of Physical Organic Chemistry》2011,24(8):657-662
The reactions of NO and Br radicals with 5‐hydroxyindole (HIn), 5‐hydroxytryptophol (HTpl), 5‐hydroxytryptophan (HTpn) and 5‐hydroxytryptamine (HTpe) were studied using pulse radiolysis. The rate constants for their reaction with NO radical were found to vary from 105 to 107 dm3 mol?1 s?1 in the pH range 5–9 but a higher value (k = 1.4 ± 0.01 × 108 dm3 mol?1 s?1) was noticed in HTpe at pH 9. The gradual increase in reactivity with pH is due to the decrease in the reduction potentials of indoloxyl radicals with E = 0.55 V at pH 9. In contrast, the rate constants with Br radical were found to be diffusion controlled and remained unaffected by the pH. The transient spectra measured are attributed to the indoloxyl radical formed on oxidation with λmax at 420 nm. The indoloxyl radicals further react with the parent hydroxy indole derivative forming the radical adduct and their decay was found to be pH dependent in derivatives containing an amino group. At pH 5, no decay of the radical adducts was seen in all derivatives up to 5 ms whereas those with the amino group decayed faster at pH 9. The total yields of the oxygen centred and carbon centred radicals formed in the reaction of NO radical with hydroxy indoles were found to be nearly equal to G(NO). Our results suggest that NO radical is inefficient in oxidizing hydroxy indoles under physiological conditions preventing the formation of toxic dimers of indole derivatives. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献