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1.
G.T. Chandrappa N. Steunou S. Cassaignon C. Bauvais P.K. Biswas J. Livage 《Journal of Sol-Gel Science and Technology》2003,26(1-3):593-596
Vanadium oxide nanotubes (VO
x
-NT) have been prepared by mixing hexadecylamine with V2O5·nH2O gels. This procedure was followed by an hydrothermal treatment (150–180°C, 2–7 days) which leads to a large quantity of VO
x
-NT. SEM and XRD analysis have been used to optimize the temperature and reaction time required for production of VO
x
-Nt and morphology of the nanotubes investigated by TEM. 相似文献
2.
Kuntebommanahalli N. Thimmaiah Winston D. Lloyd Gujjarahalli T. Chandrappa 《Transition Metal Chemistry》1985,10(3):94-96
Summary Complexes of vanillinsemicarbazone (VSC) with MnII, FeII, CoII, NiII, CuII, ZnII, CdII and HgII have been prepared and characterised by elemental analyses, molar conductance, magnetic susceptibility and spectral data.
Probable structures for the complexes are suggested on the basis of their physico-chemical properties. The fungitoxicity of
VSC and the isolated complexes have been tested on pathogenic fungi.
On leave from the University of Mysore, India. 相似文献
3.
4.
Kodihalli G. Chandrappa Thimmappa V. Venkatesha Kanagalasara Vathsala Chikkadasappa Shivakumara 《Journal of nanoparticle research》2010,12(7):2667-2678
A simple and efficient two-step hybrid electrochemical–thermal route was developed for the synthesis of large quantity of
ZnO nanoparticles using aqueous sodium bicarbonate electrolyte and sacrificial Zn anode and cathode in an undivided cell under
galvanostatic mode at room temperature. The bath concentration and current density were varied from 30 to 120 mmol and 0.05
to 1.5 A/dm2. The electrochemically generated precursor was calcined for an hour at different range of temperature from 140 to 600 °C.
The calcined samples were characterized by XRD, SEM/EDX, TEM, TG-DTA, FT-IR, and UV–Vis spectral methods. Rietveld refinement
of X-ray data indicates that the calcined compound exhibits hexagonal (Wurtzite) structure with space group of P63mc (No. 186). The crystallite sizes were in the range of 22–75 nm based on Debye–Scherrer equation. The TEM results reveal that
the particle sizes were in the order of 30–40 nm. The blue shift was noticed in UV–Vis absorption spectra, the band gaps were
found to be 5.40–5.11 eV. Scanning electron micrographs suggest that all the samples were randomly oriented granular morphology. 相似文献
5.
A simple and convenient procedure for the synthesis of nitriles by dehydration of aldoximes using a PCC (pyridiniumchlorochromate) has been developed. A variety of aromatic, heteroaromatic, and aliphatic aldoximes are converted.
Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications® for the full spectral details. 相似文献
6.
Porous inorganic solids can be synthesized in complex forms, and here we describe a simple method to create an ultralight, macroporous, crystalline vanadium oxide foam by bubbling oxygen gas produced in situ through a viscous vanadium oxide gel. This foaming process could be extended to other metal oxides. 相似文献
7.
Chandrappa Siddappa 《Tetrahedron letters》2010,51(50):6493-6497
A one-pot synthesis of benzimidazoles from gem-dibromomethylarenes is described. The reaction shows the method to prepare a variety of benzimidazole analogues with excellent yield. 相似文献
8.
Chandrappa SiddappaVinaya Kambappa Muddegowda UmashankaraKanchugarakoppal S. Rangappa 《Tetrahedron letters》2011,52(42):5474-5477
One-pot synthesis of 2-aryl benzothiazoles from gem-dibromomethylarenes using 2-aminoarylthiols is described. Benzothiazoles were obtained in high chemical yields under mild conditions. This transformation would facilitate synthesis by short reaction times, large-scale synthesis, easy and quick isolation of the products, which are the main advantages of this procedure. 相似文献
9.
Madhusudana Reddy M. Bhojegowd Ashoka Siddaramanna Anandakumar B. Siddappa Chandrappa G. Thimmanna Mohamed A. Pasha 《中国化学》2011,29(9):1863-1868
Nanocrystalline zirconium(IV) oxide (nc‐ZrO2) possessing high surface area was synthesized by a low temperature eco‐friendly solution combustion method using a new organic fuel alanine. The powder XRD, SEM and surface area measurements were carried out for characterization of nc‐ZrO2. The powder XRD results revealed that, the nc‐ZrO2 has the pure tetragonal phase. The crystallite size calculated by Scherrer's formula and BET surface area were found to be ca. 53–57 nm and ca. 275 m2/g, respectively. SEM micrograph exhibited the macroporous nature of the powder. nc‐ZrO2 has been employed as a catalyst for the solvent‐free synthesis of 3,4‐dihydro‐ pyrimidin‐2‐ones (DHPMs) by a microwave (MW) assisted one‐pot, multicomponent Biginelli condensation reaction of araldehydes, ethylacetoacetate and urea or thiourea. DHPMs are obtained in good to excellent yields (85%–96%) under this reaction condition within short interval of time (10–20 min). 相似文献
10.
N. R. Thimmegowda G. Sarala C. S. Ananda Kumar S. Chandrappa S. B. Benaka Prasad Sridhar M. Anandalwar J. Shashidhara Prasad K. S. Rangappa 《Journal of chemical crystallography》2009,39(7):484-488
Abstract The compound, 7-chloro-5-cyclopropyl-9-methyl-10-(2-piperidin-1-yl-ethyl)-5,10-dihydro-4,5,6,10-tetraaza-dibenzo[a, d] cyclohepten-11-one,
C22H26N5ClO, crystallizes in the triclinic space group Pī with cell parameters a = 8.918(7) ?, b = 9.297(7) ?, c = 14.184(8) ?, V = 1095.98(1) ?3 and Z = 2. The final residual factor R
1 = 0.0451. The structure exhibits intermolecular hydrogen bonds. The 2-piperidin-1-yl-ethyl ring adopts a chair conformation.
The starting material used to synthesize the title compound is the intermediate compound of well known anti-HIV drug Nevirapine
hence the title compound is having biological importance and hence this crystal structure will helps to structural characterization
of the molecule and also for the molecular modeling it will helps for biological study.
Graphical Abstract The title compound 7-chloro-5-cyclopropyl-9-methyl-10-(2-piperidin-1-yl-ethyl)-5,10-dihydro-4,5,6,10-tetraaza-dibenzo[a, d]
cyclohepten-11-one was synthesized by condensation of 7-chloro-5-cyclopropyl-9-methyl-5,10-dihydro-4,5,6,10-tetraaza-dibenzo[a,
d] cyclohepten-11-one with 1-(2-chloro-ethyl)-piperidine hydrochloride in presence of anhydrous powdered potassium carbonate
as base using N,N-dimethyl formamide as solvent and its crystal structure determined. The title compound derived from bioactive molecule and
it is also having biological importance hence this crystal structure will helps for the structural characterization and the
biological study of the novel molecule.
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