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Summary Copper complexes of benzil--monoxime-2-iminoethanethiol (BMETH2), benzil--monoxime-2-iminobenzenethiol (BMBTH2), benzil--monoximethiosemicarbazone (BMTH2) and benzil--monoximesemicarbazone (BMSH2) were synthesized and characterized by physicochemical and spectroscopic measurements. The molar conductivities show that all of the complexes are nonelectrolytes. The i.r. spectra suggest that the ligands are tetradentate in all cases, whilst the electronic spectra suggest planar geometries for all the complexes. The calculated e.s.r. parameters show an axial dx
2 - y
2 ground state and suggest coordination through sulphur, in agreement with the i.r. results. In all of these complexes, the =N—;O group acts as a bridging function to give dimeric structures. 相似文献
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The synthesis, characterization and analytical properties of 2-nitro-5,6-dimethyl-1,3-indanedione dithiosemicarbazone (NDIDT) are described. NDIDT is used as a chromogenic reagent for the rapid spectrophotometric determination of cobalt(II), palladium(II) and osmium(VIII). The spectrophotometric method developed for cobalt has been used in the analysis of alloys. 相似文献
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K. Srinivasa Rao Y. Lingappa M. Ravi Prakash Reddy T.L. Prakash 《Phase Transitions》2013,86(3):235-243
In this study, we successfully synthesized single-phase hexagonal closed packed (HCP) and face-centered cubic (FCC) nickel nanoparticles via reduction of nickel nitrate hexahydrate and nickel acetate tetrahydrate, respectively, in polyethylene glycol-200. Structural information of the as-synthesized nickel nanoparticles are studied by X-ray diffraction (XRD) as a function of the molar concentration of the nickel precursor. XRD results reveal that low concentrations of nickel precursor (0.005?M and below) favor the HCP, while high concentrations favor the mixture of HCP and FCC crystal structures. Particle size of HCP structure is found in the range of ~15?nm via transmission electron microscope analysis. Vibratory sample magnetometer is employed to study its magnetic behavior and the results reveal that FCC crystalline phase shows ferromagnetic nature with high saturation magnetization (M s?~?39.6?emu?gm?1) as compared to metastable HCP crystalline structure (M s?~?2?emu?gm?1). The surfactants bonding on the surface of nickel nanoparticles are studied. 相似文献
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Pd‐Mediated Multicomponent Synthesis of Highly Functionalized Pyridines and Consequential C—C Coupling Using Suzuki Reaction in One Pot: Their In Vitro Evaluation as Potential Antibacterial Agents
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L. Srinivasula Reddy T. Ram Reddy N. C. Gangi Reddy Reddy Bodireddy Mohan Y. Lingappa 《Journal of heterocyclic chemistry》2014,51(Z1):E104-E113
Pd‐mediated construction of pyridine scaffold and subsequent Suzuki‐based C—C coupling reaction in one pot has been accomplished for the synthesis of 4‐biaryl substituted 2‐amino‐3‐cyanopyridines via multicomponent reaction. The present multicomponent reaction is useful in structural elaboration of pyridine framework and also helpful in design and synthesis of novel and diverse analogs of complex heterocyclic compounds other than present reported molecules. Antibacterial activities of the synthesized compounds were systematically evaluated. The correlation between functional group variation and biological activities of the compounds has been evaluated against human pathogenic gram‐positive and gram‐negative bacterial strains. 相似文献
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Bohee Kim Usha Farey Lingappa John Magyar Danielle Monteverde Joan Selverstone Valentine Jaeheung Cho Woodward Fischer 《Molecules (Basel, Switzerland)》2022,27(5)
Soluble Mn(III)–L complexes appear to constitute a substantial portion of manganese (Mn) in many environments and serve as critical high-potential species for biogeochemical processes. However, the inherent reactivity and lability of these complexes—the same chemical characteristics that make them uniquely important in biogeochemistry—also make them incredibly difficult to measure. Here we present experimental results demonstrating the limits of common analytical methods used to quantify these complexes. The leucoberbelin-blue method is extremely useful for detecting many high-valent Mn species, but it is incompatible with the subset of Mn(III) complexes that rapidly decompose under low-pH conditions—a methodological requirement for the assay. The Cd-porphyrin method works well for measuring Mn(II) species, but it does not work for measuring Mn(III) species, because additional chemistry occurs that is inconsistent with the proposed reaction mechanism. In both cases, the behavior of Mn(III) species in these methods ultimately stems from inter- and intramolecular redox chemistry that curtails the use of these approaches as a reflection of ligand-binding strength. With growing appreciation for the importance of high-valent Mn species and their cycling in the environment, these results underscore the need for additional method development to enable quantifying such species rapidly and accurately in nature. 相似文献
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A novel series of 1,1a‐dihydro‐1‐aryl‐2‐(3‐aryl‐sydnone‐4‐yl)‐azirino[1,2‐a] quinoxalines were prepared in a one‐pot reaction of 2,3‐dibromo‐1‐(3‐arylsydnone‐4‐yl‐)‐3‐arylpropan‐1‐one with o‐phenylenediamine employing triethylamine in ethanol. The new compounds were well characterized by IR,1H NMR, mass spectra, and C,H,N analysis. 相似文献
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Lingaiah Nagarapu Raghu MallepalliLingappa Yeramanchi Rajashaker Bantu 《Tetrahedron letters》2011,52(26):3401-3404
Polyethylene glycol (PEG) was found to be an inexpensive non-toxic and effective medium for the one-pot synthesis of highly functionalized pyrroles. Utilizing this protocol various pyrrole derivatives were synthesized in excellent yields. Environmental acceptability, low cost, high yields, and recyclability of the PEG are the important features of this protocol. 相似文献
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Lingaiah Nagarapu Raghu Mallepalli U. Nikhil Kumar P. Venkateswarlu Rajashaker Bantu Lingappa Yeramanchi 《Tetrahedron letters》2012,53(14):1699-1700
A simple, efficient, eco-friendly, and cost-effective method has been developed for the synthesis of α1-oxindole-α-hydroxyphosphonate derivatives (3a–o) by a one-pot reaction of isatins (1a–o) with trialkyl phosphites (2a–o) under catalyst-free-conditions using inexpensive, non-toxic polyethylene glycol (PEG-400) in excellent yields (82–92%). The present methodology offers an environmental acceptability; low cost, high yields, and recyclability of the PEG-400 are the important features of this protocol. 相似文献
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Lingappa Malleshaa Kikkeri N.Mohana Devaraju Rakshith Sreedharamurthy Satishb 《中国化学》2011,29(1):102-108
A series of 2‐methyl‐5‐nitroaniline derivatives, 5a – 5k and 6a – 6f , were synthesized in order to determine their in vitro antimicrobial activity. The chemical structures of the synthesized compounds were confirmed by elemental analyses, UV‐visible, FT‐IR, 1H NMR and 13C NMR spectral studies. The structure‐activity relationships of the synthesized compounds were also discussed. Among the synthesized compounds, 5f , 5d , 6b and 6e showed good antimicrobial activity compared to standard drugs. 相似文献
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K. NagamaniN. Revathi P. PrathapY. Lingappa K.T. Ramakrishna Reddy 《Current Applied Physics》2012,12(2):380-384
ZnS is one of the potential candidates as a window/buffer layer for solar photovoltaic applications. Al-doped ZnS nanocrystalline films were grown by a simple and economic process, chemical solution growth method. The layers were prepared for different Al-dopant concentrations that vary in the range, 0-10 at. %. The effect of Al-doping on the composition, structure, optical, electrical and photoluminescence properties of the synthesized layers was determined using appropriate techniques. The elemental composition of a typical sample with 6 at. % ‘Al’ in ZnS was Zn = 44.9 at. %, S = 49.8 at. % and Al = 5.3 at. %. The films were nanocrystalline in nature and showed (111) plane of ZnS as the preferred orientation for all the doping concentrations. The layers with 6 at. % of Al showed a crystallite size of ∼9 nm. The FTIR studies confirmed the presence of ZnS in the layers. The layers showed an average transmittance of ∼75% in the visible region. The change of photoluminescence behaviour with dopant concentration was also studied. The electrical resistivity was considerably decreased from 107 Ωcm to 103 Ωcm with Al-doping. The detailed analysis of results will be presented and discussed. 相似文献
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