基于萘酰亚胺为发光团的新型荧光探针分子的合成

高产率合成一种新的以硫氮杂冠醚为识别位点的萘酰亚胺类荧光探针分子。该合成方法具有反应条件温和、容易提纯等优点。所得到的化合物结构经IR、NMR、MS以及元素分析确定。     

A novel 1,8-naphthalimide green fluorescent dye and its corresponding intrinsically fluorescent polyurethane latexes

A novel green fluorescent dye, 4-hexylamino-N-(2-hydroxy-1-hydroxymethylethyl)-1,8-naphthalimide (AHHNA), was designed and synthesized, and then used as a chain extender to prepare a series of intrinsically green fluorescent polyurethane (PU) latexes. The chemical structure of AHHNA and the properties of the fluorescent PU latexes and their films were characterized. It was found that the UV–Vis and the fluorescent spectra of the PUs remained fairly consistent with AHHNA, and the fluorescence emitting capacity of 1,8-naphthalimide group was enhanced by covalently bonding AHHNA onto the PU chain. The amount of AHHNA used in the latex preparation had no obvious effect on the latex colloid properties including particle size, poly index, and zeta potential. Results showed that the color difference (ΔE) and the extraction rate (R _e) of the intrinsically fluorescent PU latex film were 5.72% and 3.1%, respectively, while the ΔE and R _e of the extrinsically fluorescent PU latex film were 8.31% and 84.7%, respectively, indicating that the light fastness and the solvent fastness of the intrinsically fluorescent PU latex film were much better than those of the extrinsically fluorescent PU latex film.     

The synthesis and characterization of novel coumarin dyes derived from 1,4-diethyl-1,2,3,4-tetrahydro-7-hydroxyquinoxalin-6-carboxaldehyde

1,4-Diethyl-1,2,3,4-tetrahydro-7-hydroxyquinoxalin-6-carboxaldehyde was synthesized and condensed with substituted active methylene compounds to obtain a series of novel coumarin compounds. Solutions of the dyes in various solvents exhibited an orange hue and brilliant fluorescence and displayed high thermal stability, as determined using thermogravimetric analysis. The dye having a heterocyclic benzimidazole ring as an electron withdrawing system was selected as a representative compound for comparison of its spectral characteristics with known analogues.     

一种新型双发色团罗丹明荧光染料的合成与结构表征

基于双发色团荧光染料的优良光学性能,设计以水合肼、二硫化碳及罗丹明B为起始原料,经反应分别得到1,3-二氨基硫脲与罗丹明B酰肼。通过分子间缩合反应以1,3-二氨基硫脲两端的氨基分别连接两分子罗丹明B,合成了一种新型双发色团罗丹明荧光染料。利用~1H NMR、HRMS-ESI对所合成目标物分子结构进行表征,优化反应物配比以提高缩合反应产率,为双发色团荧光染料的合成提供新思路。     

Hollow Fe2O3 nanotubes derived from metal-organic framework for enhanced lithium storage and dye adsorption

Journal of Porous Materials - Hollow nanoparticles are of great interest in energy storage and environmental remediation due to their improved mass transfer ability and unique void space for...     

LaCl3/nano-SiO2: A novel nanocatalyst for efficient synthesis of functionalized 2,3-dihydroquinazolinones

The novel LaCl₃/nano-SiO₂ catalyst was synthesized by adsorption of LaCl₃ on nano-SiO₂ and characterized by powder XRD, FE-SEM, TEM, EDX, FT-IR spectra, BET surface area, TPD of ammonia and ICP-AES analyses. It was found as an efficient catalyst for the one-pot synthesis of 2,3-dihydroquinazolinones. All reactions proceeded with high efficacy under solvent-free conditions and gave excellent yields avoiding tedious workup and purification of products.     

A novel barbituric acid-based azo dye and its derived polyamides: Synthesis,spectroscopic investigation and computational calculations

5-[(3,5-dicarboxyphenyl)azo]-barbituric acid, an azo-based aromatic diacid was prepared and fully characterized by FT IR, ¹H and ¹³C NMR along with UV–vis absorption spectroscopy. The effects of varying pH and solvent upon the absorption spectrum of the azo dye were investigated. The optimized molecular structures of possible tautomeric forms and HOMO–LUMO energies of expecting preferred forms of the synthesized heterocyclic azo dye have been calculated using density functional theory, (B3LYP) methods with TZVP basis set level and Polarizable Continuum Model (PCM) model for solvation effect. The calculations showed that the most probably preferred form of the azo dye in gas phase and solution was a hydrazone-keto form. FT IR and UV–vis spectroscopy, DSC, TGA and XRD techniques were used to obtain the characteristics and structural features of the monomer-synthesized polyamides. The influence of organic solvents on the absorption spectra of the polymers along with viscosity measurements (0.19–0.44 dl/g), solubility and film formability of the synthesized polyamides were also investigated.     

Fluorescence from fluorescent dye based polyurethane ionomer(III)

A series of reactive fluorescent dyes were successfully synthesized and their structure was proven by IR spectra, NMR spectra, elemental analysis, and mass spectra. The fluorescence performance 6‐amino‐2(‐3‐phenyl‐propyl)‐benzo[de]isoquinoline‐1,3‐dione and 2‐benzyl‐6‐hydroxy‐benzo[de]isoquinoline‐1,3‐dione appears at around 276 and 437.4 nm, respectively, and their quantum yields are 0.662 and 0.562, respectively. It is important to indicate that the fluorescence performance is better for 6‐amino‐2(‐3‐phenyl‐propyl)‐benzo[de]isoquinoline‐1,3‐dione than for as a result of more electron donating groups linked to the 6‐amino‐2(‐3‐phenyl‐propyl)‐benzo[de]isoquinoline‐1,3‐dione molecule. These fluorescent dyes further react with toluene diisocyanate and other additives to form fluorescent dye based polyurethane (PU) ionomer molecules, and their structures are demonstracted by IR spectra. In aqueous solution, the fluorescence performance appears to be better for 6‐amino‐2(‐3‐phenyl‐propyl)‐benzo[de]isoquinoline‐1,3‐dione based PU ionomer than for 6‐amino‐2‐phenyl‐ethyl‐benzo[de]isoquinoline‐1,3‐dione based PU ionomer. For the fluorescent dye based PU ionomer molecule system, the number‐average particle sizes of the fluorescent dye based PU ionomer molecules in water increase with increasing concentration of the fluorescent dye, as a result of the increased free volume of the ionomer molecule. This may be the result of increased intermolecular interactions between ionomer– molecules themselves. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 455–465, 2005     

Preparation and performance of novel lubricating oil additives derived from 2-mercaptobenzothiazole

Three 2-dialkylaminomethylthiobenzhthiazoles were prepared, and their thermal stability, corrosion-inhibiting and lubricating characteristics as additives in lubricating oil were evaluated. The novel additives possess higher load-carrying capacity and better lubricating property.     

A series of novel indium complexes derived from aromatic carboxylic acids: Hydrothermal syntheses,crystal structures,supramolecular networks and fluorescent properties

Five new compounds with mixed-ligand formulated as (H₄bptc)(phen) (1), [In(phen)₂Cl₂](H₄bptc)(NO₃)(H₂O) (2), [In(Hbptc)(phen)(H₂O)]₂ (3), In(2,6-pydc)(phen)(H₂O)Cl (4), and {[In(2,6-pydc)(Ox)_0.5(H₂O)₂](H₂O)}₂ (5) have been synthesized under hydrothermal conditions. Compounds 1–5 display white, green and blue fluorescence at 298 K in the solid state, respectively. It is shown that 1 assumes solvent-dependent photoluminescence. By contrast, the different polarities of solvents do not alter the luminescence position of 3 and 5. The thermogravimetric curves show that binuclear compounds 3 and 5 have excellent thermal stability, whose structures are stable up to 190 and 272 °C, respectively.     

Highly selective fluorescent chemosensor for Zn2+ derived from inorganic-organic hybrid magnetic core/shell Fe3O4@SiO2 nanoparticles

ABSTRACT: Magnetic nanoparticles with attractive optical properties have been proposed for applications in such areas as separation and magnetic resonance imaging. In this paper, a simple and novel fluorescent sensor of Zn2+ was designed with 3,5-di-tert-butyl-2-hydroxybenzaldehyde [DTH] covalently grafted onto the surface of magnetic core/shell Fe3O4@SiO2 nanoparticles [NPs] (DTH-Fe3O4@SiO2 NPs) using the silanol hydrolysis approach. The DTH-Fe3O4@SiO2 inorganic-organic hybrid material was characterized by transmission electron microscopy, dynamic light scattering, X-ray power diffraction, diffuse reflectance infrared Fourier transform, UV-visible absorption and emission spectrometry. The compound DTH exhibited fluorescence response towards Zn2+ and Mg2+ ions, but the DTH-Fe3O4@SiO2 NPs only effectively recognized Zn2+ ion by significant fluorescent enhancement in the presence of various ions, which is due to the restriction of the N-C rotation of DTH-Fe3O4@SiO2 NPs and the formation of the rigid plane with conjugation when the DTH-Fe3O4@SiO2 is coordinated with Zn2+. Moreover, this DTH-Fe3O4@SiO2 fluorescent chemosensor also displayed superparamagnetic properties, and thus, it can be recycled by magnetic attraction.     

Highly selective fluorescent chemosensor for Zn2+ derived from inorganic-organic hybrid magnetic core/shell Fe3O4@SiO2 nanoparticles

Experimental investigation to study the heat transfer between a vertical round alumina-water nanofluid jet and a horizontal circular round surface is carried out. Different jet flow rates, jet nozzle diameters, various circular disk diameters and three nanoparticles concentrations (0, 6.6 and 10%, respectively) are used. The experimental results indicate that using nanofluid as a heat transfer carrier can enhance the heat transfer process. For the same Reynolds number, the experimental data show an increase in the Nusselt numbers as the nanoparticle concentration increases. Size of heating disk diameters shows reverse effect on heat transfer. It is also found that presenting the data in terms of Reynolds number at impingement jet diameter can take into account on both effects of jet heights and nozzle diameter. Presenting the data in terms of Peclet numbers, at fixed impingement nozzle diameter, makes the data less sensitive to the percentage change of the nanoparticle concentrations. Finally, general heat transfer correlation is obtained verses Peclet numbers using nanoparticle concentrations and the nozzle diameter ratio as parameters.     

阳离子荧光染料的合成及其性能研究

合成了一种新型双阳离子型荧光染料—反,反-1,4-双{2-[4-(N-乙基)溴化吡啶基]乙烯基}苯(DPPB),采用红外光谱和核磁共振谱仪对其进行了结构表征,通过染色实验研究其在腈纶织物上的染色性能及色牢度,同时研究了其单光子荧光性能。结果表明,DPPB的荧光性能良好,在腈纶织物上有良好的染色性能,所染织物具有蓝绿色荧光效果。     

噻吩甲醛的生产与应用

介绍了在三氯氧磷存在下,噻吩与N,N-二甲基甲酰胺缩合后,经水解、中和、精制制备 噻吩甲醛的合成方法及生产现状。着重介绍了在替尼酮、噻嘧啶、替尼泊苷等药物合成及噻吩乙胺 等中间体合成方面的应用,并就噻吩甲醛的生产应用及市场开拓提出了一些建议。     

氧化石墨烯插层膨润土复合材料高效吸附碱性紫3染料

通过超声途径,利用氧化石墨烯（GO）插层膨润土（Bent）制备复合材料（BGO）,并评估对碱性紫3的吸附效果。采用XRD、FTIR、BET、SEM、XPS等检测手段表征了复合材料的结构特征,通过Langmuir、Freundlich模型和伪一级、伪二级模型拟合了等温吸附数据和动力学吸附数据,范特霍夫方程研究热力学过程。结果表明：GO成功插入Bent层间,XRD图谱显示膨润土层间距从1.35nm（Bent）扩大至1.6nm（BGO）,BGO比表面积有大幅提升;吸附数据符合Langmuir等温线模型和伪二级动力学模型,在30℃、250mg/L初始浓度下,BGO最高吸附容量可达420.17mg/g,与Bent相比,BGO显示更强的吸附能力,吸附过程展现快速动态;热力学研究表明吸附过程是自发且吸热的。机理分析表明,高比表面积GO及所带含氧基团与Bent之间的协同作用共同决定BGO具有高吸附能力。     

One-pot three-component synthesis of 2H-thiopyrano[2,3-b]quinoline-2,3-dicarboxylates from 2-mercaptoquinoline-3-carbaldehydes,dialkyl acetylenedicarboxylates and Ph3P

An extremely concise one-pot procedure toward the synthesis of 2H-Thiopyrano [2,3-b]quinoline-2,3-dicarboxylates whose applications as medicines is predictable has been established. This approach produces three fused rings evolving from the formation of four new carbon–carbon bonds and a stereogenic center in a one-pot protocol.     

A hemicyanine fluorescent reactive cationic dye: synthesis and applications on wool fabrics

A novel hemicyanine fluorescent reactive cationic dye was synthesised by the reaction between the free amino group of a hemicyanine fluorescent dye and 2,3‐dibromopropionyl chloride. The dye was characterised by proton nuclear magnetic resonance spectroscopy, high‐resolution mass spectrometry, ultraviolet‐visible absorption spectrometry, and single‐photon fluorescence spectrometry. The prepared dye was applied to wool fabrics to give fluorescent orange shades. The colour fastness of the dyed wool fabrics was tested. Results show that dyed fabrics using the novel hemicyanine fluorescent reactive cationic dye could be used as fluorescent clothing.     

Organosoluble and light-colored fluorinated polyimides derived from 2,3-bis(4-amino-2-trifluoromethylphenoxy)naphthalene and aromatic dianhydrides

A novel fluorinated bis(ether amine) monomer, 2,3-bis(4-amino-2-trifluoromethylphenoxy)naphthalene, was prepared through the nucleophilic aromatic substitution reaction of 2-chloro-5-nitrobenzotrifluoride and 2,3-dihydroxynaphthalene in the presence of potassium carbonate, followed by catalytic reduction with hydrazine and Pd/C. A series of new fluorine-containing polyimides having inherent viscosities of 0.54 to 1.10 dl/g were synthesized from the diamine with various commercially available aromatic dianhydrides using a standard two-stage process with thermal imidization of poly(amic acid) films. These polyimides were highly soluble in a variety of organic solvents, and most of them afforded transparent, light-colored, and tough films with good tensile strengths. These polyimides exhibited glass transition temperatures (T_gs) of 247-300 °C and showed no significant decomposition below 500 °C under either nitrogen or air atmosphere. Except for the polyimide derived from pyromellitic dianhydride, the polyimide films were almost colorless, with an ultraviolet-visible absorption cutoff wavelength below 400 nm and low b∗ values (a yellowness index) of 10.7-41.9. These polyimides had dielectric constants of 3.09 to 3.65 (1 MHz) and moisture absorptions in the range of 0.2-0.3 wt%.     

Synthesis and characterization of novel polymers derived from gluconolactone

A novel synthesis of vinyl monomers derived from D ‐gluconolactone, an interesting precursor obtained from D ‐glucose, is reported. The derivatization of D ‐gluconolactone is carried out by first reacting methacrylic acid with a diamine in water, followed by in situ amidation of the sugar compound. Three monomers containing different lengths of alkylamido groups between vinyl and sugar residues, have thus been obtained and homopolymerized with various free‐radical initiators. The resulting polymers were analysed by viscometry and were found to exhibit polyelectrolyte behaviour. Their structures were confirmed by NMR and consist of a predominantly syndiotactic structure. Copolymerization of the gluconamidoalkyl ammonium methacrylates with other hydrophilic monomers such as methacrylamide and vinylpyrrolidone was also achieved. © 2001 Society of Chemical Industry     

A novel orange-red Sm3+-doped CaSiO3 nanostructured phosphor derived from agro food waste materials for white light applications

Trivalent samarium activated β-Wollastonite (β-CaSiO₃:Sm³⁺) nanostructured phosphor powders have been synthesized by modified sol-gel method at various concentrations (0.0, 0.2, 0.4, 0.6, 0.8 and 1 mol %) employing rice husk ash (RHA) and eggshell (ES) as the precursors for SiO₂ and CaO respectively. The powder x-ray diffraction peaks disclose structure of sintered samples as monoclinic structure with space group P1 21/c1. The average crystallite sizes were determined by Debye scherrer's formula in the range of 26–34 nm. The average particle size was 84.5 nm found from TEM images. The photoluminescence excitation (PLE) spectra recorded high intensity peak at 400 nm was owing to ⁶H_5/2 → ⁴K_11/2 transition. The emission (PL) spectra of prepared samples exhibit intense orange–red color emission peak at 602 nm due to ⁴G_5/2 → ⁶H_7/2 transition. All the prepared samples emission tuned towards white region of the CIE diagram with the increment of Sm³⁺ content. This new nanostructured phosphor material could be a probable candidate for white light display and solid-state lighting (SSL) applications.