2-巯基喹啉包裹的金纳米颗粒的制备及其电化学性质

纳米材料特有的尺寸效应、量子效应和表面效应使其具有许多异于常规材料的性质 ,在催化、生物传感器、微电子器件和磁性材料等诸多领域都有广泛的应用前景 [1] .已有专家预言 ,与纳米材料相关的技术将在新世纪经济发展中起主导作用 ,对其研究是目前科学研究中的热点 .金纳米颗粒是目前研究得最多的金属纳米材料体系 .传统的金纳米颗粒的制备方法以溶胶 -凝胶法为主 [2～ 4 ] ,所制备的金纳米颗粒的粒径较大 (一般大于 1 0 nm) ,粒径分布不均匀 ,易于团聚 ,因而限制了其应用 .为了解决上述问题 ,Brust等 [5]将硫醇化合物在金属表面的自组装…     

过氧化氢酶荧光分析法及其在海洋水生生物酶活力测定中的应用

建立了一种简便、灵敏的测定过氧化氢酶的方法.方法的线性范围为1.7×10^-3～1.7×10^-2U/mL,检测限(LD=3S₀/S)为8.5×10^-4U/mL.将其用于海洋生物样品中过氧化氢酶活力的测定,结果令人满意.     

A new fluorescent quinoline derivative toward the acid-responsivity in both solution and solid states

In this article, an acid-responsive luminescent material, 1,4-di(quinoline-6-yl)buta-1,3-diyne (DQBD) is designed and synthesized. Upon different pH values, gradual changes of fluorescence colors for DQBD in both solution and solid phases are demonstrated due to the protonation effect. Moreover, such responsive characteristics can also be reversible, suggesting DQBD as a promising fluorescent material with great potential for reusable- and accurate-pH sensors in the future.     

Origins of ‘on-off’ fluorescent behavior of 8-hydroxyquinoline containing chemosensors

Derivatives of 8-hydroxyquinoline were used as model compounds to probe the pathways of non-radiative relaxation of fluorophores in two fluorescent chemosensors. Results suggest that both photo-induced proton transfer and photo-induced electron transfer contribute to quenching the fluorescence of the chemosensors. Crystal structures of an 8-hydroxyquinoline-containing chemosensor complexed to various metal ions indicate that a proton shift occurs concomitant with complex formation. This proton shift precludes both photo-induced proton and electron transfer allowing fluorescence emission from chemosensor-metal ion complexes.     

Regio- and chemoselective transfer hydrogenation of quinolines catalyzed by a CpIr complex

An efficient method for the transfer hydrogenation of quinolines catalyzed by a Cp^∗Ir complex was developed. A variety of 1,2,3,4-tetrahydroquinolines were obtained by regio- and chemoselective transfer hydrogenation of quinolines using 2-propanol as a hydrogen source.     

Experimental Determination of the Electronic Polarizability of Quinoline and Isoquinoline in Solution by Three New Strategies

The values of electronic polarizability of quinoline and isoquinoline in extremely diluted liquid solution are reported in this paper. These were obtained by means of three new strategies based on UV-visible-NIR spectroscopy, the Kramers-Krönig relations, high precision densitometry and high exactitude refractometry, which are called here Arakawa’s Approximation (AA), Optical Substractive Approximation (OSA) and Optical Differential Approximation (ODA). In general the static electronic polarizability values of solute molecules obtained by ODA and OSA are in excellent agreement with the reported theoretical values at the Density Functional Theory (DFT) level and the Atom monopole-dipole model, but strong discrepancies were observed with the experimental values previously reported for quinoline and isoquinoline using refractometric and electro-optic methods. These differences were interpreted and analyzed in terms of dielectric intermolecular forces, resonant and pre-resonant effects. The AA method is shown to fail in predicting the polarizability of the quinoline and isoquinoline molecules.     

Synthesis of substituted quinoline via copper-catalyzed one-pot cascade reactions of 2-bromobenzaldehydes with aryl methyl ketones and aqueous ammonia

In this Letter, a new version of the Friedländer synthesis of quinoline derivatives starting from 2-bromobenzaldehydes, aryl methyl ketones, and aqueous ammonia with copper-catalyzed amination as a key step is presented. Remarkable advantages of this new quinoline synthesis include commercially available and economical starting materials, simple operational process, and excellent efficiency.     

Synthesis and Antioxidant Properties of Novel Fluorescein-Based Quinoline Glycoconjugates

A multicomponent one-pot reaction involving propargyl glycosides, fluorescein monoaldehyde, and aromatic amines using Cu(I) as catalyst is described, which provides an efficient and practical route for the synthesis of several fluorescein-based quinolone glycoconjugates in good yields. All of the synthesized quinoline glycoconjugates showed moderate antioxidant activity as evaluated with commercially available 1,1-diphenyl-2-picryl hydrazyl (DPPH).     

Synthesis and crystal structures of magnesium complexes with NNO Schiff base ligands bearing quinolyl pendant donors

A series of ketoimines bearing quinolyl pendants was prepared through Schiff base condensation of 1,3-diketones (2,4-pentanedione, benzoylmethane, and 1-benzoylacetone) and 8-aminoquinoline or 8-amino-2-methylquinoline. The ketoimines were isolated in 46–90% yield and characterized spectroscopically and crystallographically. Reaction of the ketoimines with magnesium 4-methylbenzylalkoxide yielded octahedral magnesium complexes in 67–90% yield. The spectroscopic and crystallographic properties of the magnesium complexes were explored. Structures of 1, 4, 8, 10, and 11 are reported.     

A study of the analytical behaviour of selected synthetic and naturally occurring quinolines using electrospray ionisation ion trap mass spectrometry, liquid chromatography and gas chromatography and the construction of an appropriate database for quinoline characterisation

Mass spectral fragmentation of quinoline alkaloids of significance in plants has been investigated using electrospray ionisation ion trap mass spectrometry (ESI-MSⁿ) with a view to characterisation of molecules of unknown structure isolated from these natural sources. This investigation has led to the generation of an appropriate database incorporating data from ESI-MSⁿ and also from gas liquid chromatography (GLC) and liquid chromatography (HPLC) for these low molecular mass quinolines. This has been put to practical application in the identification of quinoline alkaloids in a plant extract. Thus, an acid extraction of the leaves of Choisya ternata containing such tertiary alkaloids was analysed by liquid chromatography-electrospray ionisation mass spectrometry (HPLC-ESI-MS) and the resulting behaviour of the quinolines was compared with that of the quinoline alkaloids in the database.