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.     

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.     

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...     

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.     

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.     

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.     

Observation of B(+/-) --> p(-)pK(+/-)

We report the observation of the decay mode B(+/-) --> p(-)pK(+/-)based on an analysis of 29.4 fb(-1) of data collected by the Belle detector at KEKB. This is the first example of a b-->s transition with baryons in the final state. The p(-)p mass spectrum in this decay is inconsistent with phase space and is peaked at low mass. The branching fraction for this decay is measured to be B(B+/--->p(-)pK+/-) = [4.3(+1.1)(-0.9)(stat)+/-0.5(syst)]x 10(-6). We also report upper limits for the decays B(0)-->p(-)pK(S) and B(+/-)-->p(-)p pi(+/-).     

新试剂1-（偶氮苯基）-3-（4,5-二甲氧基-2-苯甲酸）-三氮烯与铜（Ⅱ）的显色反应

研究了1-（偶氮苯基）-3-（4,5-二甲氧基-2-苯甲酸）-三氮烯（ABDMBAT）试剂与Cu（Ⅱ）的显色反应。在TritonX-100的存在下,pH 11.0的Na2B4O7-NaOH缓冲溶液中,该试剂与铜形成红色络合物,ABDMBAT与Cu（Ⅱ）形成的络合物的最大吸收峰位于540nm处,表观摩尔吸光系数ε=8.26×104L.mol-1.cm-1,Cu（Ⅱ）在0—14μg/25mL范围内服从比耳定律。     

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。     

1—(4—吡啶甲酰)—4—芳基氨基硫脲类和3—(4—吡啶基)—4—芳基—1,2,4—三唑啉—5—硫酮类化合物~(13)C—NMR谱研究

本文测定了新合成的,具有生理活性的1-(4-吡啶甲酰)-4 -苯基氨基硫脲,1-(4-吡啶甲酰)-4-对氯苯基氨基硫脲,1-(4 -吡啶甲酰)-4-对溴苯基氨基硫脲3-(4-吡啶基)-4-苯基-1,2,4,-三唑啉-5-硫酮,3-(4-吡啶基)-4-对氯苯基-1,2,4,-三唑啉-5-硫酮,3-(4-吡啶基)-4-对溴苯基-1,2,4-三唑啉-5-硫酮六个新化合物的~(13)C-NMR谱,并通过~(13)C-NMR谱中的宽带去偶,偏共振及APT技术,模型化合物对照,讯号强度对比及芳基取代基常数计算等方法,进行了上述化合物~(13)C-NMR谱峰的归属,并得到了甲酰肼基在吡啶环4位取代后对吡啶环各碳所产生的取代基效应.     

Infrared wave guiding in Si(1)-(x)-(y)Ge(x)C(y) upon silicon: errata

In a previous Letter,(1) I was incorrectly listed by middle and last name in the aff iliation line. The name should have been listed as given above.     

5-(4-氯苯基偶氮)-8-苯磺酰氨基喹啉分光光度法测定微量镍(Ⅱ)

在 p H10 .5的 Na2 B4O7- Na OH介质及 CS(NH2 ) 2 、氯化十六烷基吡啶 (CPC)存在时 ,室温下镍 ( )与5 - (4 -氯苯基偶氮 ) - 8-苯磺酰氨基喹啉 (CPBSQ)反应 ,生成络合比为 1∶ 4的有色络合物 ,其最大吸收波长位于 6 0 0 nm。研究了反应的最佳条件 ,建立了一个测定 Ni( )的光度分析新方法。 Ni( )的浓度在 0—10 .0 μg/2 5 m L范围内符合比耳定律 ,其摩尔吸光系数为 1.93× 10 5L· mol-1·cm-1。考察了 2 0多种共存离子的影响 ,大多数常见离子在氨水沉淀分离后不干扰测定。方法用于合金钢中镍的测定 ,其相对标准偏差为 1.9%— 2 .1% ,标准加入回收率为 97%— 10 4 %。     

2,4—二氨基—6—(取代苄基)—5—甲基吡啶(2,3d)并嘧啶类化合物的~(13)C NMR研究

2,4-二氨基-6-(取代苄基)-5-甲基吡啶(2,3d)并嘧啶类化合物是一类很有前途的抗癌新药。本文研究了24种7位氯代和氧代的该类化合物的碳谱,归属了母核及取代苄基上各碳的化学位移,并对两种取代对母核碳上的化学位移的影响规律进行了探讨,文中所有数据迄今未见文献报道。     

新型荧光试剂1-(8-喹啉)-3-(3,5-二溴吡啶)-三氮烯的合成及其分析应用

将具有荧光特性的8-氨基喹啉与吡啶类试剂结合,首次合成了标题化合物1-(8-喹啉)-3-(3,5-二溴吡啶)-三氮烯(QBPyT).其结构经过元素分析、红外光谱、核磁共振谱证实.研究表明,在碱性介质中,该试剂在λex/λem=248nm/496nm处产生强荧光,并且能被Sb(Ⅲ)荧光增强.基于此,建立了QBPyT测定S...     

Electron scattering on centrosymmetric molecular dianions Pt(CN)4(2-) and Pt(CN)6(2-)

Electron scattering on stored Pt(CN)2-4 and Pt(CN)2-6 centrosymmetric molecular dianions has been performed at the electrostatic storage ring ELISA. The thresholds for production of neutral particles by electron bombardment were found to be 17.2 and 18.7 eV, respectively. The relatively high thresholds reflect the strong Coulomb repulsion in the incoming channel as well as a high energetic stability of the target electrons. A trianion resonance was identified with a positive energy of 17.0 eV for the Pt(CN)2-4 square-planar complex, while three trianion resonances were identified for the Pt(CN)2-6 octahedral complex with positive energies of 15.3, 18.1, and 20.1 eV.