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11.
《Electroanalysis》2003,15(17):1403-1409
The effect of F? on the modified films of lead dioxide in morphology and structure was studied. The results obtained by cyclic voltammetry (CV), X‐diffractometer (XRD) and scanning electron microscope (SEM) techniques indicated that F? could change the magnitude of lead dioxide crystal grain and the preferred crystallizing orientation on the substrate surface, even though it didn't change the basic structure of PbO2. When the modified electrode was applied as an analytical sensor to determine phenolic compounds, the linearity was in the range of 2×10?5 – 1×10?3 mol/L and the detection limit was 2.5×10?6 mol/L. It was all found that the stability and reproducibility of the oxide‐modified electrodes were improved by additional F?. 相似文献
12.
13.
氟阴离子在有机合成中的应用:Ⅱ.无水氟化钾催化乙酐与苯甲醛的Perkin反应 总被引:4,自引:0,他引:4
用无水醋酸盐催化苯甲醛与乙酐的Perkin反应,一般反应时间较长,产率最高为55—60%.用三乙胺、吡啶和无水碳酸钾等作催化剂,产率也无明显提高.近年来氟阴离子在有机合成中的应用迅速发展,我们曾用无水氟化钾催化成功地实施了丙二酸二乙酯与苯甲醛的Knoevenagel缩合,并研讨了该反应的微环境效应.本工作首次用无水氟 相似文献
14.
Photoluminescence, absorption and excitation spectra of K2LiAlF6 single crystals doped with 1% of Cr3+ are presented. The near-infrared photoluminescence observed at room temperature, 77 and 4 K are attributed to the zero-phonon spin-allowed 4T2(4F)→4A2(4F) transition of Cr3+ octahedrally coordinated by F− ions. Lifetimes are obtained. The 4 K emission broad band was described in terms of normal modes of the octahedral complex [CrF6]3−. The Racah, crystal-field and Huang-Rhys parameters are calculated and the quantum efficiency and thermal quenching estimated and compared with Cr3+ properties in different environments. 相似文献
15.
研究了氟离子选择电极瞬时电位分析法,其检出限和Nernst响应下限均低于传统电位分析法,空白液切换到试液时瞬时电位达到稳定的峰电位Vp比传统电位法的响应快得多,可以实现小体积试液的快速准确分析;用该法测定了自来水和矿泉水中氟的含量;利用校正曲线的截距和检出限计算了LaF3的溶度积,在0.1mol/L KNO3介质中Ksp(LaF3)=10^-28.45,在0.001mol/L柠檬酸钠+HAc-NaAc缓冲液(pH=5.50,离子强度I=0.10mol/L)介质中溶度积K′sp(LaF3)=10^-26.26;据此,计算得柠檬酸与La^3 络合物的稳定常数K1=10^5.46和K2=10^3.99;用离子水合吉氏自由能ΔGh(F^-,g)解释了不同浓度F^-试液瞬时电位的跃迁时间。 相似文献
16.
Soosai Devaraj 《Tetrahedron letters》2007,48(17):3077-3081
Novel colorimetric receptors 1-[(2-hydroxy-5-bromo-benzylidene)-amino]-anthraquinone, 1-[(2-hydroxy-5-methyl-benzylidene)-amino]-anthraquinone, and 1-[(2-hydroxy-5-nitro-benzylidene)-amino]-anthraquinone have been synthesized as fluoride ion sensors. A color change was observed visually (naked-eye) upon addition of fluoride ions in organic solvents to solutions of the receptors. 相似文献
17.
G.K. Surya Prakash Jinbo Hu Ying Wang George A. Olah 《Journal of fluorine chemistry》2005,126(4):527-532
A fluoride-induced nucleophilic (phenylthio)difluoromethylation method using TMS-CF2SPh has been achieved. This new methodology efficiently transfers “PhSCF2” group into both enolizable and non-enolizable aldehydes and ketones to give corresponding (phenylthio)difluoromethylated alcohols in good to excellent yields. Diphenyldisulfide can also be (phenylthio)difluoromethylated into PhSCF2SPh in high yield. The reaction with methyl benzoate, however, gives only low yield of (phenylthio)difluoromethyl phenyl ketone. The above-obtained PhSCF2-containing alcohols can be further transformed into difluoromethyl alcohols using an oxidation-desulfonylation procedure. This new type of nucleophilic (phenylthio)difluoromethylation methodology may have other potential applications in the medicinal and agrochemical fields. 相似文献
18.
A. Ianculescu A. Brăileanu I. Pasuk C. Popescu 《Journal of Thermal Analysis and Calorimetry》2005,80(3):663-670
Summary In the present study, the effect of the partial replacement of Pb2+ by La3+ in the lead magnesium niobate Pb(Mg1/3Nb2/3)O3 (PMN) perovskite structure was examined, taking into account the Mg-source. Pure lead magnesium niobate (PMN) and lanthanum-modified lead magnesium niobate (PLMN) having composition (Pb1-xLax) (Mg1+x/3Nb2-x/3)O3 with x=0.2 were elaborated. The phase formation was investigated by DTA/TG methods correlated with X-ray diffraction, performed on materials obtained in non-isothermal conditions. The diffraction data for the ceramics obtained by isothermal treatments emphasized the influence of the lanthanum on the crystal structure, inducing the doubling of the unit cell parameter. SEM investigations pointed out the lanthanum inhibitor effect on the grain growth process, leading to an uniform grain distribution. 相似文献
19.
An anionic sensor based on Reichardt’s betaine is described here. The dye is blue-green in chloroform but becomes colorless under protonation. Increasing amounts of different anions were added into the solution of the protonated dye. The addition of F− and caused the reappearance of the original blue-green color, while the addition of I− made the solution of the protonated dye yellow. The observations are discussed based on the fact that F− and can act as bases accepting a proton from the protonated dye and also in relation to the formation of a complex between the protonated dye and iodide. 相似文献
20.
Valderi L Dressler Dirce PozebonÉder L.M Flores José N.G PanizÉrico M.M Flores 《Analytica chimica acta》2002,466(1):117-123
A method for the determination of fluoride in coal, coal fly ash, phosphate rock, limestone, mineral clay, fossilised materials, oyster tissue and vegetation using pyrohydrolysis for sample decomposition is proposed. A specific apparatus was constructed and the influence of vanadium pentoxide (V2O5) as a catalyst for the pyrohydrolysis reaction was investigated. It was verified that V2O5 does not influence the release of fluoride from the vegetation, oyster tissue, coal and coal fly ash matrices analysed. However, the catalyst was necessary for the phosphate rock, fossil bone, mineral clay and limestone samples. Certified and noncertified samples were analysed using an ion selective electrode (ISE) for the analyte detection. Precise (relative standard deviation—R.S.D.<7%) and accurate (recovery in accordance to certified values) results were obtained. The limit of quantification (LOQ) of the method was 5.0 μg g−1 of fluoride using 20 mg of sample and a final dilution to 10 ml. The sample frequency was five samples per hour. 相似文献