5-(偶氮苯)-8-(4-硝基-1-重氮苯)-氨基喹啉与铜显色反应研究应用

研究了新试剂5－（偶氮苯）－8－（4－硝基－1－重氮苯）－氨基喹啉（PANPAQ）与铜的显色反应，在弱碱性介质中，吐温－80存在下，PANPAQ与Cu（Ⅱ）反应生成2：1紫色络合物，λmax＝615nm，ε＝5.19×10^4L·mol^-1·cm^-1，铜含量在0－15μg/25mL内符合比耳定律，方法用于生物样品中铜的测定，结果满意。     

钒（V）—7—碘—8—羟基喹啉—5—磺酸显色体系测定钢样中的钒

研究了7－碘－8－羟基喹啉－5－磺酸（H2QSI）在乙醇存在下分光光度法测定钒（V）的最佳条件。在乙醇存在下pH4的硫酸介质中，（H2QSI）与V（V）形成了红棕色配合物，最大吸收位于506nm处，表观摩尔吸光系数εmax=2.9×10^3L·mol^-1·cm^-1，有色配合物组成为V（V）：（H2QSI）＝1：3。钒（V）在0－14μg/25mL符合比耳定律。本法用于钢样中的测定，结果满意。H2QSI是光度分析中的一种显色剂，近年来，8－羟基喹啉类试剂用于钒（V）的测定尚未见报道。本文研究了V（V）与H2QSI的显色反应条件及组成，在pH4的乙醇介质中，V（V）与H2QSI生成红棕色配合物，ε506nm=2.910^3L·mol^-1·cm^-1。本方法用于低碳合金钢中钒的测定，结果满意。     

新显色剂4,4'''' -二(2,6-二溴-4-硝基苯基重氮氨基)联苯与汞显色反应的研究

本文研究了新显色剂4，4'-二（2，6－二溴－4－硝基苯基重氮氨基）联苯与Hg(Ⅱ）的显色反应，在表面活性剂Triton X-100的存在下，于pH8.8的Na2B4O7-HCl缓冲溶液中，试剂与Hg（Ⅱ）形成2：2橙红色配合物，其最大吸收峰位于490nm，表观摩尔吸光系数为7.62×10^4L·mol^-1·cm^-1。Hg（Ⅱ）量在0－12μg/25mL范围内符合比耳定律。方法用于废水中微量Hg（Ⅱ）的测定，结果满意。     

2-(2-喹啉偶氮)-4-甲基-1,3-苯二酚光度法测定铜的研究

合成了新试剂 2 - (2 -喹啉偶氮 ) - 4-甲基 - 1,3-苯二酚 (QAMDHB) ,并研究了其与铜的显色反应 ,在 p H=2 .2的磷酸 -磷酸二氢钾缓冲介质中 ,溴化十六烷基三甲基胺 (CTMAB)存在下 ,QAMDHB与铜反应生成 2∶ 1稳定络合物 ,λmax=5 5 0 nm,ε=4 .84× 10 4L· mol-1· cm-1。铜含量在 0— 2 0μg/ 2 5 m L范围内符合比耳定律 ,方法用于环境水样中铜含量的测定 ,结果令人满意     

2-(2-喹啉偶氮)-1，5-苯二酚光度法测定铜的研究

合成了新试剂 2 - ( 2 -喹啉偶氮 ) - 1,5-苯二酚 ( QADHB) ,并研究了其与铜的显色反应 ,在溴化十六烷基三甲胺 ( CTMAB)存在下 ,p H=4 .0邻苯二甲酸氢钾缓冲介质中 ,QADHB与铜反应生成 2∶ 1稳定络合物 ,λmax=540 nm,ε=2 .12× 10 4 L·mol-1·cm-1。铜含量在 0— 30 μg/ 2 5m L内符合比耳定律 ,该方法用于环境样品中铜的测定 ,结果令人满意     

溴化5-［4-(2-吡啶-乙氧基)苯基］-10，15，20-三苯基卟啉对铜离子的显色反应研究

本文研究了溴化 5- [4 - ( 2 -吡啶 -乙氧基 )苯基 ]- 10 ,15,2 0 -三苯基卟啉与 Cu2 +的显色反应条件 ,在 p H=4 .0时 ,其络合物最大吸收波长为 4 13nm,试剂最大吸收波长为 4 4 3.5nm。对比度大约为 30 nm。试剂与铜络合比为 1∶ 1,其络合物表观摩尔吸光系数为 3.4× 10 5L·mol-1· cm-1,铜含量在 0— 0 .5μg/ 10 m L范围内符合比耳定律 ,本研究可用于痕量铜的测定     

溴化5-[4-(3-吡啶丙氧基苯基)]-10，15，20-三苯基卟啉对铜离子显色反应的研究

本文研究了溴化 5- [4 - (3-吡啶丙氧基苯基 ) ]- 10 ,15,2 0 -三苯基卟啉 ,在 p H=4 .0时与 Cu2 + 的显色反应条件 ,其络合物最大吸收波长为 4 13nm。在相同条件下 ,试剂最大吸收波长为 4 4 4nm,对比度大约30 nm。试剂与铜络合比为 1∶ 1,表观摩尔吸光系数为 2 .9× 10 5L· mol-1·cm-1,铜含量在 0— 6 0 μg/ L范围内符合比耳定律 ,可用于痕量铜的测定。     

新显色剂4,4′-二(2,6-二溴-4-硝基苯基重氮氨基)联苯与汞显色反应的研究

本文研究了新显色剂４，４′－二（２，６－二溴－４－硝基苯基重氮氨基）联苯与Ｈｇ（Ⅱ）的显色反应，在表面活性剂ＴｒｉｔｏｎＸ－１００的存在下，于ｐＨ８．８的Ｎａ２Ｂ４Ｏ７－ＨＣｌ缓冲溶液中，试剂与Ｈｇ（Ⅱ）形成２∶２橙红色配合物，其最大吸收峰位于４９０ｎｍ，表观摩尔吸光系数为７．６２×１０４Ｌ·ｍｏｌ－１·ｃｍ－１。Ｈｇ（Ⅱ）量在０－１２μｇ／２５ｍＬ范围内符合比耳定律。方法用于废水中微量Ｈｇ（Ⅱ）的测定，结果满意。     

2-(1,3,4-三氮唑偶氮)-5-二乙氨基苯甲酸光度法测定铜的研究

本文研究了新显色剂 2 - ( 1,3,4 -三氮唑偶氮 ) - 5 -二乙氨基苯甲酸 ( TZDBA)与铜显色反应的条件。在0 .1mol/L的 HCl介质中 ,TZDBA与 Cu2 +形成稳定的紫红色络合物。其最大吸收波长在 5 78nm处 ,表观摩尔吸光系数为 4 .0× 10 4 L· mol-1·cm-1,Cu2 +质量浓度在 0— 10 μg/2 5 m L范围内符合比耳定律。所拟方法可不经分离直接测定镁合金和铝合金标样中的微量铜 ,加标回收率为 10 1.0 %— 10 1.4 % ,RSD( n=6)为 2 .0 %— 3.9% ,结果令人满意     

1,5-二(2-羟基-5-溴苯)-3-氰基甲(月替)(HBPCF)与铜显色反应及其应用研究

在 CTMAB存在下 ,p H为 4 .5的乙酸 -乙酸钠缓冲介质中 ,铜 ( )与 HBPCF形成 1∶ 3稳定的蓝色配合物 ,波长λmax=6 40 nm,ε640 =3.5× 10 4L· mol-1· cm-1。铜浓度在 0— 2 8μg/ 2 5 m L范围内符合比耳定律 ,可直接用于茶叶和人发中微量铜的光度法测定 ,结果满意     

1-(4-安替比林)-3-(8-喹啉)-三氮烯的合成及其分析应用

报道了新试剂1-(4-安替比林)-3-(8-喹啉)-三氮烯(APQT)的合成及其与镉(Ⅱ)的显色反应研究.在Triton X-100存在下,pH 10.5的Na2B4O7-NaOH的缓冲溶液中,试剂与镉(Ⅱ)形成2:1型的橙红色络合物,最大吸收波长为525nm,表观摩尔吸光系数为2.25×105L·mol-1·cm-1,镉含量在0-15μg/25mL范围内遵守比耳定律.     

Search for the lepton-number-violating decay Xi(-)-->pmu(-)mu(-)

A sensitive search for the lepton-number-violating decay Xi(-)-->pmu(-)mu(-) has been performed using a sample of approximately 10(9) Xi(-) hyperons produced in 800 GeV/c p-Cu collisions. We obtain B(Xi(-)-->pmu(-)mu(-))<4.0x10(-8) at 90% confidence, improving on the best previous limit by 4 orders of magnitude.     

Polyethylene glycol (PEG-400) promoted one-pot,five-component synthesis of (E)-ethyl2-(2-((E)-2-(1-(4-methyl-2-(phenylamino)thiazol-5yl)ethylidene)hydrazinyl)-4-oxothiazol-5(4H)-ylidene)acetates

Molecular Diversity - A facile, inexpensive and eco-friendly synthesis of functionalised...     

Ground- and excited-state spectroscopic studies on [1-(4-methoxyphenyl)-3-(amino)-2,4-(dicyano)-9,10-tetrahydrophenanthrene]

The effects of polar and nonpolar solvents on both the ground and the excited-state properties of [1-(4-methoxyphenyl)-3-(amino)-2,4-(dicyano)-9,10-tetrahydrophenanthrene] is examined. Light absorption results in a population of a locally excited (LE) first singlet state (S₁,n^*) which shows sensitivity to the polarity of the surrounding solvent and hydrogen-bonding ability to the quencher 4-methylpyridine. Relaxation of this state leads to an intramolecular charge-transfer state (ICT) which leads to a large Stokes shift in polar solvents and an excited-state dipole moment of _e= 10D. The quenching of the fluorescence state by 4-methylpyridine studied inn-hexane and acetonitrile at room temperature is found to be efficient and a positive deviation from linearity was observed in the Stern-Volmer plots even at concentrations of 4-methylpyridine below 0.4M. This is explained as a result of the occurrence of both a dynamic and a static quenching mechanism. The static quenching constants (K _sv) along with those obtained by visible spectroscopy (K _GS) indicate that the ground-state complex is weak and relatively solvent dependent.     

新型锌离子荧光探针(5-(二甲基氨基)-N-(4-(2-(2-喹啉亚甲基)甲酰肼基)苯基)萘-1-磺酰胺)的研究

以丹磺酰胺为荧光基团设计合成了新型Zn²⁺荧光探针DW1(5-(二甲基氨基)-N-(4-(2-(2-喹啉亚甲基)甲酰肼基)苯基)萘-1-磺酰胺)。通过紫外光谱、荧光光谱及电喷雾质谱研究了DW1对Zn²⁺的选择性识别作用。结果表明,DW1与Zn²⁺结合后荧光显著增强,荧光发射光谱由545 nm蓝移至515 nm,量子产率达到0.32,且对Zn²⁺具有较高的选择性,受常见离子的干扰较小。光谱滴定和ESI-MS谱表明DW1与Zn²⁺以1∶1的化学计量数形成配合物,平衡常数K=1.75×10⁴(mol/L)^-1。     

Synthesis of( E ) -5- ( dimethylamino ) -N- ( 4- ( 2- ( quinolin-2-ylmethylene ) -hydrazinecarbonyi ) phenyl ) naphthalene-1-sulfonamide for Detection of Zinc Ion

以丹磺酰胺为荧光基团设计合成了新型Zn2+荧光探针DW1(5-(二甲基氨基)-N-(4-(2-(2-喹啉亚甲基)甲酰肼基)苯基)萘-1-磺酰胺).通过紫外光谱、荧光光谱及电喷雾质谱研究了DW1对Zn2+的选择性识别作用.结果表明,DW1与Zn2+结合后荧光显著增强,荧光发射光谱由545nm蓝移至515nm,量子产率达到0.32,且对Zn2具有较高的选择性,受常见离子的干扰较小.光谱滴定和ESI-MS谱表明DW1与Zn2+以1:1的化学计量数形成配合物,平衡常数K=1.75×104(mol/L)-1.     

Isotope fractionation in aqua-gas systems: Cl(2)-HCl-Cl(-), Br(2)-HBr-Br(-) and H(2)S-S(2-)

We report calculated values of isotope fractionation factors between chlorine, bromine and sulphide hydrated anions and respective gaseous compounds: hydrogen chloride, hydrogen bromide, molecular chlorine and bromine and hydrogen sulphide. For the calculation of the reduced partition function ratios (β-factors) of hydrated Cl(-), Br(-) and S(2-) anions, we used a model of a cluster composed of the considered ion surrounded by two shells of H(2)O molecules. Only the electrostatic interaction between ion and water molecules treated as electric dipoles was taken into account. The β-factors for the gaseous compounds (HCl, Cl(2), HBr, Br(2) and H(2)S) were calculated from vibrational frequencies reported by Urey and Greiff [Isotopic Exchange Equilibria, J. Am. Chem. Soc. 57, 321 (1935)] and Schauble et al. [Theoretical Estimates Equilibrium Chlorine-Isotope Fractionation, Geochim. Cosmochim. Acta 67, 3267 (2003)]. Low-temperature isotope fractionation between chlorine-hydrated anion and hydrogen chloride attains 1.55-1.68‰ (this work), which is in good agreement with experimental data (1.4-1.8‰) [Z.D. Sharp, J.D. Barnes, T.P. Fischer and M. Halick, An Experimental Determination of Chlorine Isotope Fractionation in Acid Systems and Applications to Volcanic Fumaroles, Geochim. Cosmochim. Acta 74, 264 (2010)]. The predicted isotope fractionations for hydrated bromine and HBr, Br(2) gases are very small, 1000?ln α, do not exceed 0.8‰; thus, the expected variations of bromine isotope composition in aqua-gas systems will require enhanced precision for their detection. In contrast, the sulphur isotope fractionation between H(2)S( gas ) and S(2-) attains 6.0‰ at room temperature and drops nearly linearly to 3.1‰ at 350°C.     

Observation of 1(-)0(-) final states from psi(2S) decays and e(+)e(-) annihilation

Using CLEO data collected from CESR e(+)e(-) collisions at the psi(2S) resonance and nearby continuum at sqrt[s]=3.67 GeV, we report the first significantly nonzero measurements of light vector-pseudoscalar hadron pair production (including rhopi, omegapi, rhoeta, and K(*0)K0 ) and the pi(+)pi(-)pi(0) final state, both from psi(2S) decays and direct e(+)e(-) annihilation.