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《Analytical letters》2012,45(6):1075-1086
Abstract A novel plasticized membrane sensor for Ho(III) ions based on N‐(1‐thien‐2‐ylmethylene)‐1,3‐benzothiazol‐2‐amine (TBA) as a neutral carrier was prepared. The best performance was obtained with a membrane composition of 31% PVC, 61% benzyle acetate, 2% sodium tetra phenyl borate and 6% carrier. The electrode exhibits a Nernstian response for Ho(III) ions over a particular concentration range (1.0×10?5?1.0×10?2 M) with a slope of 19.7±0.2 mV decade?1. The limit of the detection is 7.0×10?6 M. The sensor has a response time of <15 s and a useful working pH range of 4.0–9.5. The proposed sensor discriminates relatively well towards Ho(III) ions with regard to common alkali, alkaline earth, and specially lanthanide ions. It was successfully applied as an indicator electrode in a potentiometric titration of Ho(III) ions with EDTA. It was also applied in determination of fluoride ions in a mouth wash preparation. The proposed sensor was applied for the determination of Ho(III) ion concentration in binary mixtures. 相似文献
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This study presents for the first time development of a highly selective and sensitive thulium(III) micro‐sensor. Theoretical calculations were conducted on a S‐N Schiff base [thiophene‐2‐carbaldehyde‐(7‐methyl‐1,3‐benzothiazol‐2‐yl) hydrazone] (TCMH) in order to obtain a clue about the tendency of TCMH to Tm(III) and some other metal ions. Then, TCMH was used as a membrane‐active component to prepare a Tm(III)‐selective polymeric membrane microelectrode. In line with the resulting data, the electrode exhibits a Nernstian response toward Tm(III) ions for a very wide concentration range (1.0×10?11–4.0×10?6 M) with a detection limit of 1.0×10?11 (ca. 1.5 ppt) and a very fast response time in the whole concentration range (<5 s). In addition, the results showed that the certain microelectrode could be applied in the pH range of 4.0–11.0 with a usage of more than one month without any considerable potential divergence. 相似文献
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3‐Amino‐benzo[d]imidazo[2,1‐b]thiazoles were synthesized in moderate to good yields in the presence of NH4Cl via a one pot procedure. All the products were characterized by 1H NMR, IR, HRMS. 相似文献
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Using methanol-water mixtures as the mobile phase,the chro-matographic retention parameters k' and Rf were determined by reversed-phase high-performance liquid chromatography(RP-HPLC)and reversed-phase high-performance thin-layer chromatography(RP-HPTLC)for N-(benzothiazol-2-yl)-o) amino alkyl phosphonic diesters and the correlation with lipophilicity parameter(ClogP)was established.Logkw values obtained from RP-HPLC and R values obtained from RP-HPTLC can be used to evaluate the lipophilicity of this kind of compounds.Chromatographic method is a good alternative for lipophilicity measurement. 相似文献
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N-(2-(取代苯并噻唑-2-氨基甲酰基)-取代苯基)-4-氟苯甲酰胺衍生物的合成及生物活性 总被引:2,自引:0,他引:2
以对氟苯甲酸和取代邻氨基苯甲酸为起始原料,设计并合成11个含氟基苯并噻唑基邻甲酰氨基苯甲酰胺类化合物,其结构经1 H NMR、13C NMR、IR及元素分析确证.初步生物活性测试结果表明,在500 mg/L浓度下部分化合物对烟草花叶病毒(TMV)有一定抑制作用.采用MTT法进行化合物抑制PC3及Bcap-37癌细胞体外活性测试,结果表明所合成的化合物具有不同程度的抑制PC3和Bcap-37癌细胞活性,其中化合物4d在10 μmol·L-1浓度下对PC3和及Bcap-37的抑制率分别为73.2%和68.1%. 相似文献
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A novel rearrangement reaction about 2-benzothiazolylthioacetyl hydrazide (1) to produce s-triazolo[3,4-b] benzothiazol-3-thiol (3) in the presence of KOH and CS2 was described.Other way to synthesize 3 from 2-benzothiazolyl-hydrazine (2) under the same condition was compared and the Mannich reaction of compound 3 was reported too.Their structures were established by elemental analyses,IR,^1H nmr and MS spectra. 相似文献
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