Langmuir-Blodgett film based on MEH-PPV for cholesterol biosensor

Cholesterol oxidase (ChOx) has been immobilized onto conducting poly[2-methoxy,5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV)/stearic acid (SA) Langmuir-Blodgett film transferred onto octadecanethiol (ODT) modified gold plate. The ChOx/MEH-PPV/SA LB film bioelectrode exhibits has been characterized by FT-IR, contact angle, and atomic force microscopy. The response of the ChOx/MEH-PPV/SA LB film bioelectrode carried out using differential pulse voltammetry (DPV) studies reveal linearity from 1.29 to 12.91 mM of cholesterol concentration and response time as 30 s. This ChOx/MEH-PPV/SA bioelectrode exhibits values of correlation coefficient as 0.9939, standard deviation as 0.0029 μA and limit of detection as 1.66 mM. UV-visible spectrophotometer studies reveal that 5.2 × 10⁻³ U of ChOx are actively working per cm² area of ChOx/MEH-PPV/SA LB film bioelectrode and this bioelectrode is thermally stable upto 55 °C with reusability of about 60 times.     

水溶性荧光聚合物用于测定聚赖氨酸

合成了一种水溶性荧光聚合物聚[5-甲氧基-2-(3-磺酰化丙氧基)-1,4-苯撑乙烯](MPS-PPV),对该聚合物进行了元素分析、红外光谱及透射电子显微镜表征.实验结果表明,聚赖氨酸(PLL)对该聚合物荧光具有明显的猝灭作用,据此建立了一种快速灵敏测定聚赖氨酸的新方法,检出限为5.0×10^-10mol/L.探讨了聚赖氨酸猝灭MPS-PPV荧光的机理.     

Poly (1,3-[2-methoxy-4-hydroxy-5-acetylphenylene] butylene) (HMAP-BG) as a polymeric ligand

Poly(1,3[2-methoxy-4-hydroxy-5-acetylphenylene]butylene) was prepared by Friedel-Craft polycondensation of 2-hydroxy, 4-methoxyacetophenone and 1,4-butane-diol in presence of poiyphosphoric acid catalyst. The polymer samples were characterized by IR spectra, TGA and their M_n determined by nonaqueous titration. Viscosity measurents in DMSO showed that solutions exhibited normal behaviour. Polymers were complexed with Cu(II), Ni(II), Mn(II), Co(II) and Zn(II) and characterized. Chelation and ion exchange properties were also studied by employing the batch equilibrium method.     

Fluorescence behaviour of 4-[5-(2-phenyloxazolyl)] benzenesulfonic acid and N-hexyl-4-[5-(2-phenyloxazolyl)] benzenesulfonamide in homogeneous micellar and microemulsion systems

The fluorescence and excitation spectra of 4-[5-(2-phenyloxazolyl)]benzenesulfonic acid (PPOS) and N-hexyl-4-[5-(2-phenyloxazolyl)] benzenesulfonamide (PPOSA) were investigated in homogeneous solutions of varying polarities (hexane, heptane, butanol and water) and in aqueous micellar systems of anionic surfactants (bis(2-ethylhexyl)sulfosuccinate, sodium salt (AOT), sodium dodecyl sulfate (SDS)) and cationic surfactants (benzyldimethylhexadecylammonium chloride (CDBA), hexadecyltrimethylammonium chloride (CTAB)). These compounds were also investigated in different oil-in-water (o/w) and water-in-oil (w/o) microemulsions of the system composed of SDS, n-butanol, cyclohexane and water. The results revealed that the two probes exhibit pronounced spectral changes in response to the changes in the polarity of the medium, and in hydrophobic—hydrophilic interactions. The spectral behaviour of PPOS and PPOSA in micellar systems indicates that these two probes are incorporated at the interface of the cationic micelles. In microemulsions, however, the probes exhibit different Stokes shifts compared with those found for homogeneous solutions, indicating different salvation processes of both the ground and the excited states.     

聚对苯乙炔（PPV）及其衍生物的研究进展

评价了ＰＰＶ系列衍生物的电学性质、非线性光学性质及其应用。     

含亚甲基和双二氮杂萘酮结构的聚芳酮的合成与性能

聚芳醚酮是一类重要的具有优异综合性能的工程塑料 ,它具有高的热稳定性、尺寸稳定性、耐溶剂性、好的加工性能和电性能 ,因而它经常作为复合材料的基质、粘合剂等被广泛的应用于航空、航天和电子等领域 .近几十年来 ,人们付出了很大的努力去开发聚芳醚酮新品种[1,2 ] .本研究组以 4 (4′ 羟基苯氧基 ) 2 ,3 二氮杂萘 1 (2Ｈ) 酮为缩聚单体制备了一系列的性能优良的聚芳醚酮[3～ 6] ,在主链中引入高密度的氮杂萘酮结构是获得高热稳定性和良好溶解性的重要途径 .由单体中含有更多的氮杂萘酮结构获得可溶解且耐温等级更高的聚芳酮是人们期…     

A new benzofuran from the heartwood of Dalbergia latifolia

A new benzofuran compound, named 2-[5-hydroxy-4-methoxy-2-(3-p-henyl-trans-allyloxy)benzyl]-5-hydroxy-6-methoxy-3-phenylbenzofuran (1), together with (+)-obtusafuran (2) and isoparvifuran (3), was isolated from the heartwood of Dalbergia latifolia. Their structures were elucidated by a combination of spectroscopic methods and comparison with the literature. Compounds 2 and 3 were obtained from this plant for the first time. Compound 1 exhibited moderated antioxidant effect for scavenging 1,1-diphenyl-2-picryhydrazyl (DPPH) free radical (IC₅₀ = 96.7 ± 8.9 μM).     

Effects of Mechanical Stretching on the Properties of Conjugated Polymers: Case Study for MEH-PPV and P3HT Oligomers

Nowadays, the development of new materials for applications in flexible optoelectronic devices is one of the main frontiers of science. However, in order to improve the applicability and durability of such devices, a deeper understanding of the effects induced by mechanical deformations on the properties of their components is still necessary. In this sense, in the present study, it is evaluated the effect of mechanical stretching in the structural, electronic, and optical responses of two widely investigated organic polymers with great technological interest: poly(2-methoxy,5-(2′-ethylhexyloxy)-1,4-phenylene vinylene) and poly(3-hexylthiophene-2,5-diyl). Hartree–Fock and density functional theory electronic structure calculation methods were employed for the study of oligomeric structures subjected to increasing stretch levels along the polymerization axis. The results show a dependence of the polymer properties with the mechanical deformation, allowing to identify distinct response regimes according to the main chain stretching. In particular, it is noticed that large stretches lead to nonfunctional devices, mainly due to the localization of the frontier orbitals and degradation of optoelectronic properties. In addition, it was also identified that very small deformations can lead to some interesting optoelectronic responses, which could indicate an alternative route for the design of organic devices via mechanical processes. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018 , 56, 1413–1426     

超声法合成聚[2-甲氧基-5-(2′-乙基己氧基)-对亚苯基亚乙烯基]的研究

采用超声合成方法,以对甲氧基苯酚为起始原料,经醚化、溴甲基化和聚合反应,得到无凝胶、完全可溶、高分子量的聚(2-甲氧基-5-(2′-乙基己氧基)-对亚苯基亚乙烯基)(MEH-PPV),其数均分子量高达9.5×105,分子量分布为2.4.并通过核磁共振氢谱(1H-NMR)和红外光谱进行了结构表征.与常规的机械搅拌反应相比,超声合成方法具有反应时间短、反应温度低、产率高、聚合物分子量较大等特点,特别是这种方法有效抑制了聚合过程中的凝胶化问题,合成的MEH-PPV具有更高的荧光量子效率.     

Simultaneous determination of vanadium, niobium and tantalum by high-performance liquid chromatography equipped with on-line enrichment using 2-[2-(5-bromoquinolinylazo)]-5-diethylaminophenol as pre-column derivatization reagent

The chelator 2-[2-(5-bromoquinolinylazo)]-5-diethylaminophenol (5-Br-QADEAP) was synthesized. A method was developed for the simultaneous determination of vanadium, niobium and tantalum as metal–5-Br-QADEAP chelates using rapid column high performance liquid chromatography along with an on-line enrichment technique. Vanadium, niobium and tantalum were pre-column derivatized with 5-Br-QADEAP to form colored chelates. The chelates were separated on a 4.6 × 10 mm, 1.8 μm rapid analytical column with acetonitrile–water (50:50, v/v) containing pH 4.5 phosphate buffer and 0.01 mol L⁻¹ of citrate as the mobile phase. The chelates were separated completely within 2.5 min. The detection limits (S/N = 3) of vanadium, niobium and tantalum are 1.6, 1.6, and 1.8 ng L⁻¹, respectively. This method was applied to the determination of vanadium, niobium and tantalum in alloy steel, water, and geologic samples with good results.     

由MOPIP配体构筑的两种金属配合物的合成、表征及晶体结构(英文)

采用水热法由2种不同金属盐和MOPIP(MOPIP=2-(4-methoxyphenyl)-1H-imidazo[4,5-f][1,10]phenanthroline)配体合成了2种新型零维配合物[Cd(MOPIP)3(H2O)9]4n(1)和[Mn(MOPIP)3(H2O)6]2n(2),并对其进行了元素分析、红外光谱表征、热失重和X射线单晶衍射测定。结果表明,每个金属中心离子与来自3个不同MOPIP分子上的6个氮原子进行配位,形成畸变的八面体构型。     

1-[4-(1,2,4-三唑-5-硫酮)]-3-对甲氧基苯甲酰基硫脲镍配合物的晶体结构

采用缓慢蒸发法培养出化合物1-[4-(1,2,4-三唑-5-硫酮)]-3-对甲氧基苯甲酰基硫脲镍配合物晶体,并通过X-射线单晶衍射法测定了晶体结构,它为P2/n空间群的单斜晶体,晶胞参数为α=1.2577(2)nm,b=0.88790(17)nm,c=1.2628(2)nm,V=1.3304(4)nm3,R1=0.0291和wR2=0.0694.     

Synthesis and Crystal Structure of 1-（4-Fluorophenyl）-2-hexylthiobenzo[4,5]-furo[3,2-d]-1,2,4-triazolo[1,5-a]pyrimidin-5（1H）-one

The crystal structure of the title compound 1-(4-fluorophenyl) -2-hexylthio-benzo [4,5]furo[3,2-d]-1,2,4-triazolo[1,5-a]pyrimidin-5(1H) -one(C23H21FN4O2S,Mr = 436.5) has been prepared and determined by single-crystal X-ray diffraction. The crystal is of monoclinic,space group P21/n with a = 13.9854(3) ,b = 17.2678(4) ,c = 18.1828(5) ,β = 99.364(2) °,V = 4332.58(18) 3,Z = 4,Dc = 1.338,F(000) =1824,μ = 0.185 mm-1,MoKa radiation(λ = 0.71073) ,R = 0.0538 and wR = 0.1162 for 4728 observed reflections with I > 2σ(I) . X-ray diffraction analysis reveals the fused rings of benzo[4,5]furo[3,2-d]-1,2,4-triazolo[1,5-a] pyrimidin-5(1H) -one system are nearly coplanar. The crystal packing is mainly stabilized by weak intermolecular C-H···O hydrogen bond and π-π interactions.     

Swelling behaviour of crosslinked hydrogels based on (2-hydroxyethyl methacrylate) with a zwitterionic comonomer (1-3-sulfopropyl-2-vinyl-pyridinium-betaine)

Copolymeric hydrogels were prepared by the chemically initiated free radical copolymerization in aqueous solution of mixtures of [1-(3-sulfopropyl)-2-vinyl-pyridinium-betaine] (SPV) and (2-hydroxyethyl methacrylate) (HEMA) in the presence of a crosslinking agent N,N′-methylene-bis-acrylamide (MBA). The hydrogels were swollen to equilibrium in water and aqueous KSCN at 298 K and their swelling behaviour has been investigated using gravimetric measurements. The effects of the concentration of KSCN and the mole fraction of SPV in the feed (F_s) have been noted and discussed. The main findings are:(a) In water, the water content (W₁) of copolymeric hydrogels is insensitive to SPV content at F_s ? 0.45. In contrast, W₁ decreases sharply with decreasing F_s within the range of 0 < F_s < 0.45. (b) In aq. KSCN, the degree of total swelling (W) exceeds the value in pure water, the enhancement in swelling being most marked at low values of [KSCN]. The content of water within the hydrogel increases with KSCN concentration in the swelling medium for low values of [KSCN], but thereafter falls with further increase in salt concentration. In contrast, the salt content within the swollen hydrogel displays a continuous increase with increasing [KSCN]. All these results of item (b) are for copolymeric hydrogels within the full range of F_s (0 < F_s < 1). (c) at a fixed aq. KSCN concentration, both W and W₁ increase sharply with increasing F_s over the entire range of copolymer composition.     

Reactions of 5-[3-(trifluoromethyl)-phenyl]furan-2-carbaldehyde

The Knoevenagel condensations of 5-[3-(trifluoromethyl)phenyl]furan-2-carbaldehyde with seven compounds containing an active methyl or methylene group have been studied. The compounds used were: methyl 2-cyanoacetate, malononitrile, 2-furylacetonitrile, acetophenone, 2-thioxo-1,3-thiazolidin-4-one (rhodanine), 5,5-dimethylcyclohexane-1,3-dione (dimedone), and methyl 2-azidoacetate. The effect of microwave irradiation on the condensation reactions was studied and compared with “’classical”’ conditions. Thermolysis of methyl 2-azido-3-{5-[3-(trifluoromethyl)phenyl]-2-furyl}propenoate afforded methyl 2-[3-(trifluoromethyl)phenyl)]-4H-furo[3,2-b]pyrrole-5-carboxylate. (2E)-3-{ 5-[3-(Trifluoromethyl)phenyl]-2-furyl}propenoic acid was converted to the corresponding azide, which was cyclized on heating into 2-[3-(trifluoromethyl)phenyl)]-4,5-dihydrofuro[3,2-c]pyridin-4-one. The latter after successive action of POCl₃ and NH₂NH₂-Pd/C gave 2-[3-(trifluoromethyl)-phenyl]furo[3,2-c]pyridine. Published in Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 825–831, June, 2006.     

α-乙酰氨基-β-[4-(1, 2-二氢-2-硫代喹啉)]丙酸乙酯的合成及结构鉴定

α-乙酰氨基-β-[4(1,2-二氢-2-氧代喹啉)]丙酸乙酯以五硫化二磷为硫化剂,经选择性硫代反应合成新化合物α-乙酰氨基-β-[4(1,2-二氢-2-硫代喹啉)]丙酸乙酯,并使用IR、UV、NMR、GC/MS及元素分析对其结构进行了鉴定.     

Synthesis of a solvent-sensitive highly fluorescent derivative of perfluorocyclopentene

A solvent-sensitive highly fluorescent compound, N-[2-(1′,3′,4′,4′,5′,5′-hexafluorocyclopentenyl)]-4-(5-methoxy-thiazolyl)pyridine (1D) was synthesized as an unexpected product of the reaction of 4-bromo-5-methoxy-2-(4-pyridyl)thiazole (1B) with perfluorocyclopentene in the presence of n-BuLi. Primary mechanism of this reaction was proposed, and the photophysical properties of 1D in different solvents were studied.     

Synthesis of 5-[2-(Phenoxy)ethyl] Derivatives of 6-Methyluracil, 6-Methyl-2-thioxo-2,3-dihydro-1H-pyrimidin-4-one,and 2-Imino-6-methyl-2,3-dihydro-1H-pyrimidin-4-one

A synthesis of novel derivatives of 6-methyluracil, 6-methyl-2-thioxo-, and 2-imino-6-methyl-2,3-dihydro-1H-pyrimidin-4-one containing a 2-(phenoxy)ethyl substituent at position 5 of the pyrimidine ring has been carried out. It was found that 5-[2-(phenoxy)ethyl] derivatives of 6-methyl-2-thioxo- and 2-imino-6-methyl-2,3-dihydro-1H-pyrimidin-4-one are obtained by the condensation of the corresponding ethyl 3-oxo-2-(2-phenoxyethyl)butanoates with thiourea or guanidine. 6-Methyl-5-[2-(phenoxy)ethyl]uracils can be prepared by treating 6-methyl-5-[2-(phenoxy)ethyl]-2-thioxo-2,3-dihydro-1H-pyrimidin-4-ones with an excess of aqueous monochloroacetic acid solution. __________ Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1213–1217, August, 2005.     

Synthesis of (2-hydroxy-5-nitrophenyl)di[1-(2-hydroxynaphthyl)]methane and 12-[1-(2-hydroxynaphthyl)]-10-nitro-12H-benzo[α]xanthene from of 5-nitrosalicylaldehyde derivatives and β-naphthol

The reaction of the morpholinal or anil of 5-nitrosalicylaldehyde with β-naphthol yielded (2-hydroxy-5-nitrophenyl)di[1-(2-hydroxynaphthyl)]methane. Condensation of the latter compound in boiling nitromethane gave 12-[1-(2-hydroxynaphthyl)]-10-nitro-12H-benzo[α]xanthene. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1336–1339, July, 1997.     

新试剂5-(对-苯胺偶氮)-2,3-二氢-1,4-酞嗪二酮的电化学发光研究

应用自制的ECL-1型电致化学发光仪,对新试剂5-(对-苯胺偶氮)-2,3-二氢-1,4-酞嗪二酮(简称ADPD)在Na_2CO_3-NaHCO_3-H_3BO_3缓冲介质中的电化学发光行为作了研究。结果表明,当介质pH值为10.20时,在各种选定的实验条件下,施加+2.0V(vs.SCE)三角波脉冲电压,体系发光强度与ADPD浓度在2×10~(-9)～1×10~(-7)mol/L范围内呈线性关系。反应的检测限为5×10~(-10)mol/L。并且提出了ADPD电化学发光的可能机理。