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     

新试剂2-羧基-5-硝基苯基重氮氨基-4-苯基-2-噻唑光度法测定微量铜的研究

本文研究了新试剂 2 -羧基 - 5 -硝基苯基重氮氨基 - 4 -苯基 - 2 -噻唑 ( CNPDAPT)在 Triton X- 1 0 0的存在下 ,与铜显色反应的适宜条件。结果表明在 p H1 0 .0的 Na2 B4O7- Na OH缓冲介质中 ,铜与试剂形成 1∶ 1红色配合物 ,其最大吸收波长位于 5 1 5 nm,表观摩尔吸光系数 ε=4.5 9× 1 0 4 L· mol- 1· cm- 1 ,铜量在0 - 2 0 μg/ 2 5 m L范围内遵守比耳定律。方法用于水样中微量铜的测定 ,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     

新型尾式卟啉-吡啶季铵盐对铜(Ⅱ)显色反应研究

研究了三种新型不同链长尾式卟啉 -吡啶季铵盐与Cu2 的显色反应条件 ,其络合物最大吸收波长分别为 4 13nm(Ⅰ ) ,(Ⅱ ) ;4 14nm(Ⅲ )。在相同条件下 ,试剂最大吸收波长分别为 4 4 3 5nm(Ⅰ ) ;4 4 4nm(Ⅱ ) ;4 4 6nm(Ⅲ )。对比度大约 30nm。试剂与铜络合比均为 1∶1,表观摩尔吸光系数为 (Ⅰ ) 3 4× 10 5,(Ⅱ )2 9× 10 5;(Ⅲ ) 2 5× 10 5L·mol-1·cm-1,铜含量分别在 (Ⅰ ) 0～ 0 5 μg·( 10mL) -1;(Ⅱ ) 0～ 0 6 μg·( 10mL) -1;(Ⅲ ) 0～ 1 0 μg·( 10mL) -1内符合比尔定律 ,可用于痕量铜的测定。     

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     

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     

4-(2-吡啶偶氮)-间苯二酚光度法测定煤灰中钒

在 0 .6 mol· L-1的硫酸介质中 ,钒 - PAR-羟胺生成红色络合物 ,最大吸收波长为 5 5 0 nm,摩尔吸光系数ε=1.91× 10 4L· mol-1· cm-1,钒含量在 0— 80μg/ 2 5 m L范围内符合比耳定律。本方法灵敏、简便 ,用于测定煤灰中的钒 ,结果满意     

2-[(5-溴-2-吡啶)-偶氮]-5-二乙氨基苯酚分光光度法测定岩石中微量铌

在酒石酸介质中 ,铌 (V)与 5- Br- PADAP生成兰紫色的三元络合物 ,最大吸收波长为 6 0 0 nm,络合物的表观摩尔吸光系数为 5.7× 10 4 L·mol-1· cm-1,Nb2 O5含量在 0— 2 0 μg/2 5m L范围内符合比耳定律。有色络合物稳定 3天以上。本法简便 ,快速 ,用于岩石中微量铌的测定 ,结果令人满意。     

N，N‘－双（2－水杨醛缩氨基苯基）1，3－丙二酸二酰胺与锌的显色反应研究

本文研究了新试剂 N,N′-双 (2 -水杨醛缩氨基苯基 ) 1,3-丙二酸二酰胺 (H2 Sapma)与锌的灵敏显色反应。在 p H为 7.0— 7.8的硼砂 - HCl缓冲溶液中。配合物的组成比是 Zn∶H2 Sapma=1∶ 1,配合物的最大吸收波长在 4 10 nm处 ,表观摩尔吸光系数为 1.6 9× 10 4L· mol-1· cm-1,锌量在 0— 4 0μg/2 5 m L范围内符合比耳定律。用于测定人发及强化营养盐中微量锌 ,结果令人满意。     

5-(2-苯并噻唑偶氮)-8-氨基喹啉作为钴的光度分析试剂及应用研究

在阳离子表面活性剂溴化十六烷基三甲基铵存在下 ,于 p H=9.2的硼砂缓冲介质中 ,5 - (2 -苯并噻唑偶氮 ) - 8-氨基喹啉与钴 ( )形成 2∶ 1的蓝色配合物 ,其最大吸收波长位于 6 5 0 nm处 ,表观摩尔吸光系数为 1.2 4× 10 5L· mol-1· cm-1。钴浓度在 0— 10 .0μg/2 5 m L范围内 ,符合比耳定律。应用于维生素 B12 和水系沉积物中微量钴的测定 ,获得了满意的结果。     

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...     

Synthesis,in vitro $$\alpha $$-glucosidase inhibitory activity,and in silico study of ( E)-thiosemicarbazones and ( E)-2-(2-(arylmethylene)hydrazinyl)-4-arylthiazole derivatives

This study is focused on the identification of thiazole-based inhibitors for the \(\alpha \)-glucosidase enzyme. For that purpose, (E)-2-(2-(arylmethylene)hydrazinyl)-4-arylthiazole derivatives were synthesized in two steps and characterized by various spectroscopic techniques. All derivatives and intermediates were evaluated for their in vitro \(\alpha \)-glucosidase inhibitory activity. Thiosemicarbazones 20 and 35, and cyclized thiazole derivatives 2, 5–11, 13, 15, 21–24, 27–31, and 36–37 showed significant inhibitory potential in the range of \(\hbox {IC}_{50}=6.2\pm 0.19\)–\(43.6\pm 0.23~\upmu \hbox {M}\) as compared to standard acarbose (\(\hbox {IC}_{50}=37.7\pm 0.19~\upmu \hbox {M}\)). A molecular modeling study was carried out to understand the binding interactions of compounds with the active site of enzyme.     

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.     

(2R,5S)-N-间氟苄基-2,5-二甲基哌嗪的合成

以(2R,5S)-2,5-二甲基哌嗪为原料,经过成盐,单取代反应,用D-酉石酸对光学异构体的手性拆分,用氢氧化钠游离,最终合成(2R,5S)-N-间氟苄基-2,5-二甲基哌嗪,反应总收率为83％.该物质的合成未见文献报道,目标化合物用1H NMR,IR进行结构表征.     

The (22(0)1-00(0)0) Band of CO(2) at 6348 cm(-1): Linestrengths, Broadening Parameters, and Pressure Shifts

The (22(0)1-00(0)0) combination band of CO(2) around 6348 cm(-1) is studied with diode-laser spectroscopy, and linestrengths, collision-broadening parameters, and pressure shifts are determined. Linestrengths are modeled with a third-order Herman-Wallis expansion, and discrepancies with values reported in the literature are explained. Copyright 2000 Academic Press.     

Synthesis,Spectral, Solvent Dependent Linear and Nonlinear Optical Characteristics of (E)-N-(3-(3-(4(dimethylamino)phenyl)acryloyl) phenyl)quinolone-2-carboxamide

This paper presents the synthesis of novel organic compound (E)-N-(3-(3-(4(dimethylamino)phenyl)acryloyl)phenyl)quinolone-2-carboxamide, also known as Quinolinecarboxamide Chalcone (QCC) using aldol condensation and carboxamide formation method. The organic sample QCC was examined by FT-IR, ¹H NMR, ¹³C NMR and mass spectroscopic techniques, respectively. Linear and third-order nonlinear optical (TNLO) properties of QCC dissolved in polar solvents such as DMSO, DMF and Ethanol have also been studied. The order of nonlinear refractive index and nonlinear absorption coefficient of QCC was measured to be 10^?11 m²/W and 10^?5 m/W. The nonlinear refractive index (n₂) of QCC was attributed to negative nonlinearity due to self-defocusing effect, and nonlinear absorption coefficient (β) indicates the behaviors of saturable absorption (SA) and reverse saturable absorption (RSA). The real and imaginary features of the TNLO susceptibility (χ⁽³⁾) of QCC in polar solvents were calculated to be the order of 10^─7 esu. The spectral characteristics of solvent on TNLO susceptibility of QCC were discussed. The results divulged that the synthesized organic compound is a novel nonlinear optical (NLO) material for applications in photonics and optoelectronics.

     

手性分子2, 3-丁二醇的旋光拉曼光谱研究

本文从拉曼峰和旋光拉曼峰出发,通过键极化率和微分键极化率分析研究(2R, 3R)-2, 3-丁二醇. 通过分子C₁和C₂两种点群的优化结构,获得不依赖于这两种结构的结果 和有关这个手性系统物理图像的丰富信息.对分子拉曼键极化率分析,得出在拉曼弛豫过程中, 电荷主要从外围流向骨架结构.对分子微分键极化率的分析,显示在不对称C原子和与其相联系的H原子 两侧化学键, C-O和C-CH₃的微分键极化率的符号正好相反,意味着这个分子具有相当好的手性 不对称性质.对比对称和反对称的键极化率、微分键极化率,本文得到这样的结论: 对于(特别是键伸缩的)键极化率,(大体上是)对称的大于反对称的; 而对于微分键极化率则是反对称的大于对称的. 关键词： 旋光拉曼 键极化率 微分键极化率 2,3-丁二醇     

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.