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Crystal Structure Analysis of 3-(4-ethylphenyl)-3H-chromeno[4,3-c]isoxazole-3a(4H)-carbonitrile
Malathy, P.,Ganapathy, Jagadeesan,Srinivasan, J.,Manickam, Bakthadoss The Basic Science Institute Chosun University 2015 조선자연과학논문집 Vol.8 No.4
The crystal structure of the potential active 3-(4-ethylphenyl)-3H-chromeno[4,3-c]isoxazole-3a(4H)-carbonitrile ($C_{19}H_{16}N_2O_2$) has been determined from single crystal X-ray diffraction data. In the title compound crystallizes in the monoclinic space group $P2_1/c$ with unit cell dimension a=6.6869 (8) ${\AA}$, b=15.8326 (19) ${\AA}$ and c= 15.237 (2) ${\AA}$ [${\alpha}=90^{\circ}$, ${\beta}=100.663^{\circ}$ and ${\gamma}=90^{\circ}$]. In the structure chromene, isoxazole and carboxylate are almost coplanar each other. All geometrical parameters revelled that chromene ring of pyran ring adopt sofa conformation. The crystal packing is stabilized by intermolecular C-H...N and C-H...O hydrogen bond interaction.
Malathy Narayanasamy,Y. Sukhi 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.11
The starting time of a large-rated variable-speed pumped storage unit (PSU) operating in pumping mode is crucial in the power balancing scenario in a modern power system because it establishes the transition period from generation to pumping modes, and vice versa, which determines the power system stability. Doubly fed induction machines (DFIM) are preferred in large-rated variable-speed PSUs (> 100 MW) because they ensure variable-speed operation through partial-rated power converters. Initiating the DFIM in pumping mode is challenging, but it is overcome by utilizing rotor-side power converters. The start-up of DFIM is preferred through short-circuiting the stator windings and supplying power to the rotor windings via power converters. However, this task can be performed through either short-circuiting the rotor or stator windings. This work detailed the field-oriented vector control strategies of the rotor short-circuited method and compared the results with the conventional stator short-circuited method in a commercial 306 MVA DFIM-fed variable-speed PSU. Results demonstrate that short-circuiting the rotor windings reduces the starting time and power consumption by 27.5% and 27%, respectively, compared with the typical starting method. This reduced starting time is preferred by the grid authorities because it improves the power system stability. Furthermore, experimental results are validated in the laboratory with a scaled-down unit of 7.5 kW DFIM.
Malathy, P.,Jagadeesan, G.,Gunasekaran, K.,Aravindhan, S. The Basic Science Institute Chosun University 2016 조선자연과학논문집 Vol.9 No.4
Filariasis causing nematode Brugia malayi is shown to harbor wolbachia bacteria as symbionts. The sequenced genome of the wolbachia endosymbiont from B.malayi (wBm) offers an unprecedented opportunity to identify new wolbachia drug targets. Hence the enzyme carbonic anhydrase from wolbachia endosymbiont of Brugia malayi (wBm) which is responsible for the reversible interconversion of carbon dioxide and water to bicarbonate and protons (or vice versa) is chosen as the drug target for filariasis. This enzyme is thought to play critical functions in bacteria by involving in various steps of their life cycle which are important for survival, The 3D structure of wBm carbonic anhydrase is predicted by selecting a suitable template using the similarity search tool, BLAST. The BLAST results shows a hexapeptide transferase family protein from Anaplasma phagocytophilum (PDB ID: 3IXC) having 77% similarity and 54% identity with wBm carbonic anhydrase. Hence the above enzyme is chosen as the template and the 3D structure of carbonic anhydrase is predicted by the tool Modeller9v7. Since the three dimensional structure of carbonic anhydrase from wolbachia endosymbiont of Brugia malayi has not yet solved, attempts were made to predict this protein. The predicted structure is validated and also molecular docking studies are carried out with the suitable inhibitors that have been solved experimentally.
Malathy, P.,Sharmila, P.,Srinivasan, J.,Manickam, Bakthadoss,Aravindhan, S. The Basic Science Institute Chosun University 2016 조선자연과학논문집 Vol.9 No.2
The crystal structure of the potential active 6-ethoxy-3-phenyl-5a,9a-dihydro-3H-chromen[4,3-c][1,2]oxazole-3a(4H)-carbonitrile ($C_{19}H_{15}N_2O_3$) has been determined from single crystal X-ray diffraction technique. The title compound crystallizes in the monoclinic space group C2/c with unit cell dimension a= 29.3026(9) ${\AA}$, b= 6.7695(2) ${\AA}$ and c= 19.7597(6) ${\AA}$ [${\alpha}= 90^{\circ}$, ${\beta}= 125.709(10)^{\circ}$ and ${\gamma}= 90^{\circ}$]. Single crystals suitable for X-ray diffraction were obtained by slow evaporation method, the isoxazole and six membered pyran rings adopts envelope conformation. The crystal packing of the molecules is stabilized by the weak $C-H{\ldots}N$ hydrogen bond interaction.
Malathi Arumugam,Myong Yong Choi 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.3
Visible light active bismuth vanadate (BiVO4) nanoparticles were fabricated by the facile hydrothermal method. The crystal structure and formation of the prepared BiVO4 were examined by X-ray diffraction and Fourier-transform infrared spectroscopy. The optical absorption property of BiVO4 was measured by ultraviolet?vis diffuse reflectance spectroscopy. The photocatalytic activity of the as-prepared BiVO4 photocatalyst was assessed for the photodegradation of methylene blue (MB) under visible light irradiation (VLI). About 91.9% degradation in 90?min was observed when BiVO4 was used as a photocatalyst. Furthermore, the effect of varying the experimental parameters such as the catalyst amount, pH, and dye concentration were studied. Finally, the possible mechanism for MB degradation is presented.
Malathy, P.,Sharmila, P.,Srinivasan, J.,Manickam, Bakthadoss,Aravindhan, S. The Basic Science Institute Chosun University 2016 조선자연과학논문집 Vol.9 No.2
The crystal structure of the potential active Methyl 8-bromo-3-phenyl-5a,9a-dihydro-3H-chromen [4,3-c][1,2] isoxazole-3a(4H)-carboxylate ($C_{18}H_{15}BrNO_4$) has been determined from single crystal X-ray diffraction technique. The title compound crystallizes in the triclinic space group Pī with unit cell dimension a=8.3129 (3) ${\AA}$, b=9.5847 (4) ${\AA}$ and c=11.1463(4) ${\AA}$ [${\alpha}=98.457(3)^{\circ}$, ${\beta}=102.806(2)^{\circ}$ and ${\gamma}=105.033(5)^{\circ}$]. Single crystals suitable for X-ray diffraction were obtained by slow evaporation method, the isoxazole and six membered pyran rings adopts envelope conformation. In the crystal, molecules are linked via pairs of inter molecular $C-H{\ldots}O$ hydrogen bonds to form dimmers.
Recent progress on bismuth oxyiodide (BiOI) photocatalyst for environmental remediation
Malathi Arumugam,Myong Yong Choi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
There are huge prospects for environmental remediation using semiconductor photocatalysts thatdecompose toxic pollutants under the illumination of light. This review article offers an outline of theapplications of BiOI photocatalyst for the efficient decomposition of pollutants exist in the aqueousecosystem. In addition, methods for synthesizing and modifying BiOI are emphasized to providestrategies for improving their photocatalytic activity. Furthermore, recent research progress and futurepredictions for BiOI photocatalyst are also summarized. This review will offer vision into the fabricationof novel and highly active BiOI-based photocatalysts in a green manner at low operational cost.
Crystal Structure Analysis of 3-(4-ethylphenyl)-3-Hchromeno[4,3-c]isoxazole-3a(4H)-carbonitrile
P. Malathy, Jagadeesan Ganapathy, J. Srinivasan, Bakthadoss Manickam 조선대학교 기초과학연구원 2015 조선자연과학논문집 Vol.8 No.4
초록 The crystal structure of the potential active 3-(4-ethylphenyl)-3H-chromeno[4,3-c] isoxazole-3a(4H)-carbonitrile (C19H16N2O2) has been determined from single crystal X-ray diffraction data. In the title compound crystallizes in the monoclinic space group P21/c with unit cell dimension a=6.6869 (8) Å, b=15.8326 (19) Å and c= 15.237 (2) Å [α=90°, β= 100.663° and γ= 90°]. In the structure chromene, isoxazole and carboxylate are almost coplanar each other. All geometrical parameters revelled that chromene ring of pyran ring adopt sofa conformation. The crystal packing is stabilized by intermolecular C-H...N and C-H...O hydrogen bond interaction.