Crystal structure of 8-hydroxyquinolin-ium 2-carboxy-6-nitrobenzoate mono-hydrate

The authors thank SAIF, IIT Madras for the data collection.Peer reviewedPublisher PD

Methyl 6-(4-chloro­phen­yl)-2,4-dimethyl-1,3-dioxo-1,2,3,4,6,6a,7,12b-octa­hydro­chromeno[4′,3′:4,5]pyrano[2,3-d]pyrimidine-6a-carboxyl­ate

In the title compound, C24H21ClN2O6, the two fused six-membered pyran rings adopt half-chair conformations. The dihedral angle between the pyrimidine ring and the chloro­phenyl ring is 51.55 (3)°. In the crystal, mol­ecules are linked by pairs of weak inter­molecular C—H⋯O hydrogen bonds, forming inversion dimers. A C—H⋯π inter­action is also observed

GREEN SYNTHESIS AND CHARACTERIZATION OF SILVER NANOPARTICLES FROM WITHANIA SOMNIFERA (L.) DUNAL

The metal nanoparticle synthesis is highly explored the field of nanotechnology. The biological methods seem to be more effective because of slowreduction rate and polydispersity of the final products. The main aim of this study is too the rapid and simplistic synthesis of silver nanoparticlesby Withania somnifera Linn. at room temperature. The exposure of reaction mixtures containing silver nitrate and dried leaf powder of W. somniferaresulted in reduction of metal ions within 5 minutes. The extracellular synthesized silver nanoparticles were characterized by ultraviolet-visible,infrared (IR) spectroscopy, X-ray diffraction studies, zeta potential, Fourier transform IR, and scanning electron microscopy. The antibacterial andantifungal studies showed significant activity as compared to their respective standards. From the results, W. somnifera sliver nanoparticle has attainedthe maximum antimicrobial against clinical pathogens and also seen very good stability of nanoparticle throughput processing. As we concluded, thistype of naturally synthesized sliver nanoparticle could be a better green revolution in medicinal chemistry.Keywords: Antimicrobial activity, Silver nanoparticles, Withania somnifera

Methyl 3-(4-isopropyl­phen­yl)-1-phenyl-3,3a,4,9b-tetra­hydro-1H-chromeno[4,3-c]isoxazole-3a-carboxyl­ate

In the title compound, C27H27NO4, the five-membered isoxazole ring adopts an envelope conformation and the six-membered pyran ring adopts a half-chair conformation. The dihedral angle between the mean planes of the isoxazole ring and the chromene ring system is 54.95 (4)°

Growth, Optical and Dielectric Studies on Pure and L-Lysine Doped KDP Crystals

Optically good quality single crystals of pure and L-lysine monohydrochloride-doped KDP crystals have been grown by a slow evaporation method. The grown crystals have been subjected to optical and dielectric studies. The UV-Vis spectrum shows the transmitting ability of the crystals in the entire visible region and transmittance percentage is increased for the doped KDP crystals. From the dielectric study, it is found that the dielectric constant and the dielectric loss of L-lysine-doped KDP crystals were lower than the pure KDP crystals. Hence L-lysine-doped KDP crystals are found to be more beneficial from an application point of view as compared to pure KDP crystals

4-[(E)-(4-Diethyl­amino-2-hy­droxy­benzyl­idene)amino]-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one

In the title compound, C22H26N4O2, the phenyl ring and hy­droxy­benzene group are twisted with respect to the central pyrazolone ring, making dihedral angles of 54.05 (5) and 21.80 (6)°, respectively. One of the ethyl groups is disordered over two positions with site occupancies of 0.872 (6) and 0.128 (6). The mol­ecular structure features short intra­molecular O—H⋯N and C—H⋯O contacts. The crystal packing exhibits weak inter­molecular C—H⋯O and C—H⋯π inter­actions

(Acetoxy)(2-methylphenyl)methyl acetate

In the title compound, C12H14O4, the two acet­oxy groups are inclined by 57.92 (5)° and 62.71 (6)° to the benzene ring. An inter­molecular C—H⋯O inter­action involving the two acet­oxy groups generates a centrosymmetric dimer via an R 2 2(16) ring motif

2,4-Diiodo-6-{[4-(morpholin-4-yl)phenyl]iminomethyl}phenol

In the title compound, C17H16I2N2O2, the two aromatic rings are almost coplanar [dihedral angle 2.57 (15)°]. The morpholine ring adopts a chair conformation. The mol­ecular structure is stabilized by an O—H⋯N hydrogen bond and the crystal packing exhibits weak inter­molecular C—H⋯O and π–π [centroid-to-centroid distances 3.663 (3)-4.073 (3) Å] inter­actions

5-Meth­oxy-2-{[4-(morpholin-4-yl)phen­yl]imino­meth­yl}phenol

In the title compound, C18H20N2O3, the dihedral angle between the two aromatic rings is 33.66 (6)°. The morpholine ring adopts a chair conformation. The mol­ecular structure is stabilized by an intra­molecular O—H⋯N hydrogen bond. In the crystal, mol­ecules are linked via weak inter­molecular C—H⋯O and C—H⋯π inter­actions