Haldorai Yuvaraj

A facile approach to the synthesis of high-quality NiO nanorods: electrochemical and antibacterial properties

This report describes a new approach to successfully synthesize high-quality nickel oxide (NiO) nanorods with an average diameter of about 60 nm and a length of less than one micrometre viathermal decomposition of a precursor complex nickel benzoate dihydrazinate at 100 °C. The structural features, crystallinity, purity and morphology of the as-synthesized NiO nanorods were investigated by Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), selected area electron diffraction (SAED) and transmission electron microscopy (TEM). The electrochemical property of the as-synthesized NiO nanorods was investigated to determine their suitability as anode materials for lithium-ion batteries. The nanorod electrode exhibited better reversibility and high capacity. In addition, the nanorods showed good antibacterial properties. The magnetic measurement demonstrated that the NiO nanorods are ferromagnetic and may be used in the fields of MR imaging and magnetic drug delivery.

Triflic Anhydride: A Mild Reagent for Highly Efficient Synthesis of 1,2-Benzisoxazoles, Isoxazolo, and Isothiazolo Quinolines Without Additive or Base

Abstract The synthetic utility of trifluoromethanesulphonic anhydride (triflic anhydride, TA) without additive or base for the high-yielding synthesis of a wide variety of 1,2-benzisoxazoles from 2-hydroxyaryl aldoximes and ketoximes under mild conditions has been carried out for the first time. As a continuation of our study, syntheses of isoxazolo and isothiazolo quinolones have also been demonstrated using triflic anhydride under similar conditions. This method is simple and has benefits from the easy way to isolate the products in excellent yields. [Supplementary materials are available for this article. Go to the publishers online edition of Synthetic Communications® for the following free supplemental resource(s): Full experimental and spectral details.] GRAPHICAL ABSTRACT

(Z)-2-[2-(4-Methyl­benzyl­idene)hydrazin­yl]pyridine

Molecules of the title compound, C13H13N3, are essentially planar (r.m.s. deviation for all non-H atoms = 0.054 Å). The dihedral angle between the two aromatic rings is 6.33 (5)°. In the crystal, pairs of centrosymmetrically related molecules are linked through N—H⋯N hydrogen bonds, forming N—H⋯N dimers with graph-set motif R22(8).

8-[(Hydrazinyl-idene)meth-yl]-4-methyl-2-oxo-2H-chromen-7-yl 4-methyl-benzene-sulfonate.

In the title compound, C18H16N2O5S, the coumarin ring system is nearly planar, with a maximum out-of-plane deviation of 0.078 (1) Å (r.m.s. deviation = 0.046 Å). The dihedral angle between the coumarin ring system and the toluene ring (r.m.s. deviation = 0.004 Å) is 2.77 (1)°. The crystal packing is stabilized by C—H⋯O and N—H⋯O intermolecular hydrogen bonds generating C(8), C(9) and C(11) chains and R 2 2(14), R 2 2(23) and R 4 3(13) ring graph sets.

(E)-Ethyl 2-cyano-3-(1H-pyrrol-2-yl)acrylate.

All the non-H atoms of the title compound, C10H10N2O2, are nearly in the same plane with a maximum deviation of 0.093 (1) Å. In the crystal, adjacent molecules are linked by pairs of intermolecular N—H⋯O hydrogen bonds, generating inversion dimers with R 2 2(14) ring motifs.

Ethyl 4-(3-bromo­phen­yl)-6-methyl-2-oxo-1,2,3,4-tetra­hydro­pyrimidine-5-carboxyl­ate

In the title compound, C14H15BrN2O3, the dihydropyrimidinone ring adopts a boat conformation. In the crystal, adjacent molecules are linked through N—H⋯O hydrogen bonds forming an R22(8) ring motif and generating a zigzag chain extending in [010].

8-Formyl-4-methyl-2-oxo-2H-chromen-7-yl 4-methyl­benzenesulfonate

In the title compound, C18H14O6S, the coumarin ring system is nearly planar, with a maximum out-of-plane deviation of 0.032 (2) Å. The dihedral angle between the benzene ring and the coumarin ring system is 32.41 (8)°. The crystal packing is stabilized by intermolecular C—H⋯O interactions, generating C(8), C(10) and C(11) chains and an R 2 2(10) ring. The formyl group is disordered over two sets of sites, with occupancies of 0.548 (5) and 0.452 (5).

In-situ preparation of biopolymer/Fe 3 O 4 hybrid nanocomposites in supercritical carbon dioxide

Poly(2-hydroxyethyl methacrylate) magnetic nanocomposites was synthesized by dispersion polymerization in supercritical carbon dioxide in the presence of 3-(trimethoxysilyl) propylmethacrylate surface modified Fe 3 O 4 nanoparticles using poly(DMAEMA-co-FOMA) a stabilizer. The resulting products were characterized for structure, morphology, thermal behavior by FT-IR, TEM, TGA, XRD, and XPS techniques. These studies indicated that Fe 3 O 4 nanocomposites were coated with a polymer layer. Magnetic property of the nanocomposites was measured using MPMS XL 7.0, which indicated that the nanocomposites are superparamagnetic and a saturation magnetization of 5.5 emu/g with 40% Fe 3 O 4 content.

1-(2-Azidoacetyl)-3-methyl-2,6-diphenylpiperidin-4-one

In the title compound, C20H20N4O2, the piperidine ring adopts a distorted boat conformation. The two phenyl rings form dihedral angles of 82.87 (1) and 84.40 (1)° with respect to the piperidine ring. The crystal packing is stabilized by intermolecular C—H⋯O and C—H⋯N interactions.