The effect of non-chelating oximes on the solvent extraction of nickel(II) and cobalt(II) by solutions of carboxylic acids (H2A2) in xylene has been studied. Synergistic enhancements of extraction were found with aldoximes, but not with ketoximes. The synergistic effects are larger for nickel th...
In a wide search program toward new and efficient antimicrobial agents, a series of substituted piperidin-4-one oxime ethers (5a–5k) was synthesized and tested for their in vitro antibacterial and antifungal activities. Also, the structures of these oxime ethers and their relative stereochemist...
The synthesis and structure–activity relations for a new class of centrally active NK-1 receptor antagonists are described. The new compounds are based on piperazine 2 and contain an oxime ether functionality. Several new compounds have high affinity for the NK-1 receptor and show good antagoni...
(l)-Proline-catalysed reaction of 1-alkyl/aralkylpiperidin-4-ones with (E)-4-arylbut-3-en-2-ones furnishes novel isoquinoline derivatives, with two or three rings, in good yields via tandem Robinson annulation–Michael addition(s) sequences, while the reaction of 1-arylpiperidin-4-ones with (E)-...
A short and efficient chemoenzymatic pathway was developed to produce both enantiomeric forms of allyl alcohols possessing a bulky aromatic substituent at the stereogenic center, namely (E)-4-(2′,5′-dimethylphenyl)-but-3-en-2-ol and (E)-4-(benzo[d][1′,3′]dioxol-5′-yl)-but-3-en-2-ol. Alcohol...
In the current work a new third-order nonlinear optical organic single crystal of (2E)-3-(4-Methylphenyl)-1-(3-nitrophenyl) prop-2-en-1-one (ML3NC) has been grown with well-defined morphology using the slow evaporation solution growth technique. X-ray diffraction technique was used to confirm th...
When used as a homogeneous catalyst, iridium trichloride was found to change order of the reaction with respect to cerium(IV) sulphate concentrations in the oxidation of 3-phenyl propanal in aqueous acidic medium. Cerium(IV) and organic substrate form complex in the first equilibrium step. This ...
Kinetic data suggest reduction of CeIV into CeIII and elimination of Cl− and H+ ions before the rate-determining step in iridium(III) chloride catalyzed oxidation of cyclohexanol and cyclooctanol by cerium(IV) sulphate in aqueous sulphuric acid medium. IrCl3 was found to be equal or even a bette...
Iridium(III) chloride catalyzed oxidation of toluene and ethyl benzene by cerium(IV) sulphate in aqueous sulphuric acid medium was studied. Change in the concentration of oxidant shows a specific effect that the rate increases in the beginning at low concentrations, it reaches to a maximum and f...
A microwave synthetic method has been developed for novel electroluminescent Ir(III)-polypyridine complexes. The novel Ir(III)-polypyridine complexes give intensively multi-colored luminescence whose emission peaks are occurred ranging from 450 to 630 nm. The chemical properties and electrolumin...
Nanocomposite materials have been synthesized by electrodeposition of iridium oxide nanoparticles into poly(pyrrole-alkylammonium) films coated by oxidative electropolymerization of a pyrrole-alkylammonium monomer onto carbon electrodes, and characterized by electrochemistry in aqueous electroly...
Density functional theory (DFT) calculations were performed to examine the excited triplet states of various eight iridium(III) complexes and the relationship between these states and the emission spectra. The complexes investigated were 1 [Ir(NO3)2(phen)2]PF6, 2 [IrCl2(phen)2]PF6, 3 [Ir(NO2)2(d...
Reflux of acidified aqueous solutions of 1,10-phenanthroline(L) and (NH4)3IrCl6 for 10 min to 2 hr gives variable products containing mixtures of the species [IrLCl4]−and [IrL(OH)Cl3]−. After 2 weeks of reflux the compound [IrL2Cl2]Cl·2H2O and the corresponding adduct [IrL2Cl2] NO3·2H2O·HNO3 ...
The heat capacity of ytterbium orthovanadate was first measured by adiabatic calorimetry in the temperature range T = 12.28–344.06 K. No obvious anomalies were observed on the curve obtained. The values of standard thermodynamic functions in the temperature range T = 0–400 K were calculated. B...
In view of the potential application of NIR luminescence in biology, a series of four new 3,5-Heptanedione (β-diketonate) ytterbium complexes, e.g. [Yb(L)3(H2O)2] (1), [Yb(L)3(2,2′-bpy)] (2), [Yb(L)3(dpq)] (3) and [Yb(L)3(dppz)] (4) have been designed and isolated. Crystal structures analysis ...
The thermal shock properties of mixed Yb2Si2O7 and Yb2SiO5 composite environmental barrier coating (EBC) topcoat, with various Yb2Si2O7-to-Yb2SiO5 ratios, are investigated between room temperature and 1500 °C. The results show that, with more Yb2Si2O7 introduced, the mixed Yb2Si2O7 and Yb2SiO5 ...
We experimentally demonstrate a dissipative soliton resonance (DSR) Ytterbium-doped fiber laser with high-purity cylindrical vector beam (CVB) generation, using a mode-selective coupler (MSC) as transverse mode converter and splitter. The all-normal-dispersion mode-locked Ytterbium-doped fiber l...
Ytterbium silicide nanoobjects were synthetized using pulsed laser ablation in an oven at temperatures of 800 and 1000 °C. Ablation of divided target Si/Yb in a flow of Ar resulted in deposits which contained mostly ytterbium silicide nanowires, nanorods and nanoparticles. Single nanoparticles ...
The preparation, sintering and low-temperature physical properties of four kinds of ytterbium sulfides (η-Yb2S3, ε-Yb2S3, Yb3S4 and YbS) were systematically investigated. The suitable sintering processes were ensured for each ytterbium sulfide. SEM results suggested the sintered ytterbium sulf...
A tunable dual-wavelength ytterbium-doped fiber ring laser based on Sagnac interferometer is proposed and experimentally demonstrated. Due to a broad gain bandwidth of ytterbium-doped fiber, a tuning range of 17.9 nm for single-wavelength lasing output and 8.4 nm for dual-wavelength lasing have ...
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