Deen Dayal Upadhyay Gorakhpur University

About: Deen Dayal Upadhyay Gorakhpur University is a education organization based out in Gorakhpur, Uttar Pradesh, India. It is known for research contribution in the topics: Thermal decomposition & Lymnaea acuminata. The organization has 1032 authors who have published 1591 publications receiving 21734 citations. The organization is also known as: Gorakhpur University.

Solvent free reactions

Abstract: Reactions of nitrophenols have been studied in the eutectic melt of 8-hydroxyquinoline–benzoic acid, where it reacted with 8-hydroxyquinoline. The reactions were also carried out in solution. The reaction products obtained from both the methods were characterized by FT-IR, differential scanning calorimetry, X-ray diffraction technique and microstructural investigations. The reaction products obtained from eutectic melt were analyzed for C, H, N. The results showed that reaction products obtained from both the methods are same. An attempt has been made to propose the overall mechanism of the reaction in the eutectic melt.

Synthesis and spectral studies of some new dimeric [(μ-Cl)2M2(L)2 · xTHF] [M = Zn(II) and Hg(II)] complexes containing Schiff-base ligands

Abstract: A series of binuclear Schiff-base complexes of zinc(II) and mercury(II) containing bidentate ligands (HL) [HL = salicylidene-2-methyl-1-aminobenzene (HL1), salicylidene-2-aminopyridine (HL2), and salicylidene-3-nitro-1-aminobenzene (HL3)] with “N” and “O” donors have been synthesized by simple metathetic reactions of anhydrous metal chlorides with sodium salts of Schiff bases (in tetrahydrofuran (THF)/MeOH) in equimolar ratio to produce [(µ-Cl)2M2(L)2 · xTHF] [where M = Zn(II) and Hg(II); L = HL1, HL2, and HL3; x = 0 for (1), (4), (6) and x = 2 for (2), (3), (5)]. The main emphasis on the complexes [(µ-Cl)2M2(L)2 · 2THF] (2), (3), and (5) is given due to their five-coordinate environment around metal ions. The complexes have been characterized by elemental analyses (M, Cl, C, H, N), melting point, and spectral (FT-IR, 1H-NMR, and 13C-NMR) studies. The structural composition of the complexes has been determined by FAB-MS spectral studies. FAB-MS showed the isotopic molecular ion peak [M+] and fragments sup...

Antiviral Activity of Essential Oils and Acetone Extracts of Medicinal Plants Against Papaya Ring Spot Virus

Abstract: The volatile oils and acetone extracts of Anethum graveolens, Ppiper nigrum, Foeniculum vulgare, Cuminum cyminum, Carum copticum, Curcuma longa and Nigella sativa were tested for antiviral activity against papaya ring spot poty virus, using Chenopodium amaranticolor coste et Reyn, a local lesion host. The volatile oils of all the tested spices showed significant inhibitory activity (25–100%) at different dilutions. The volatile oils Cuminum cyminum, Carum copticum, Nigella sativa and Curcuma longa were found to be most effective among all the tested oils. Acetone extract of Carum copticum, Curcuma longa, Nigella sativa and Foeniculum vulgare showed better antiviral activity as compared to other tested extracts.

Theoretical study on the gas-phase reactions of ethyl butyrate with OH radicals at 298 K

Abstract: Detailed theoretical investigation has been carried out on the mechanism, kinetics, and thermochem- istry of the gas-phase reactions of CH3CH2CH2C(O) OCH2CH3 with OH radicals using a modern DFT func- tional. Reaction profiles are modeled with the formation of pre- and post-reactive complexes. Energetic calculations are made at M06-2X/6-31?G(d,p) level of theory. Intrinsic reaction coordinate calculation has also been performed to confirm the smooth transition from the reactant to product through the respective transition state. It has been estab- lished that the reaction proceeded via H-atom abstraction from the -CH2 position of ethyl butyrate. The calculated rate constant using canonical transition state theory is found to be in a reasonable agreement with the experi- mental data. Using group-balanced isodesmic reactions, the standard heats of formation of ethyl butyrate and radicals generated by H-atom abstraction are also reported for the first time. The branching ratios of the different reaction channels are also determined. The estimated atmospheric life time of ethyl butyrate is found to be 2.37 days.