Synthesis and characterization of soluble oligo (9,10-bisalkynylanthrylene)s

Soluble oligo(9,10-bialkynylanthryiene)s up to pentamers were synthesized by means of the Suzuki coupling reaction. A solution processed thin film field-effect transistor from pentamer OA-5b shows a charge carrier mobility of 2.95 x 10(-3) cm(2)/V center dot s.

Sol-gel-derived carbon ceramic electrode containing 9,10-phenanthrenequinone, and its electrocatalytic activity toward iodate

9,10-Phenanthrenequinone (PQ) supported on graphite powder by adsorption was dispersed in propyltrimethoxysilane-derived gels to yield a conductive composite which was used as electrode material to fabricate a PQ-modified carbon ceramic electrode. In this configuration, PQ acts as a catalyst, graphite powder guarantees conductivity by percolation, the silicate provides a rigid porous backbone, and the propyl groups endow hydrophobicity and thus limit the wetting region of the modified electrode. Square-wave voltammetry was exploited to investigate the pH-dependent electrochemical behavior of the composite electrode and an almost Nernstian response was obtained from pH 0.42 to 6.84. Because the chemically modified electrode can electrocatalyze the reduction of iodate in acidic aqueous solution (pH 2.45), it was used as an amperometric sensor for the determination of iodate in table salt. The advantages of the electrode are that it can be polished in the event of surface fouling, it is simple to prepare, has excellent chemical and mechanical stability, and the reproducibility of surface-renewal is good.

荧光衍生试剂1-[2-（对甲苯磺酸醋）乙基]2-苯基咪唑[4,5-f]9,10-菲的合成及其在长链脂肪酸分析中的应用

合成了新的荧光衍生试剂1-[2-（对甲苯磺酸酯）乙基]-2-苯基咪唑[4,5-f]9,10-菲（TsEPIP），并将其作为柱前衍生化试剂，在Eclipse XDB-C：色谱柱上采用梯度洗脱实现了11种长链（C_(20)～C_(30)）游离脂肪酸（FFA）衍生物的基线分离。利用柱后在线的串联质谱并以大气压化学电离源（APCI）的正离子模式实现了各组分的质谱定性。对土壤及3种苔醉（东亚毛灰鲜、锦丝鲜、羽平鲜）中FFA组分的定量结果表明，苔鲜植物从土壤中富集了大量的长链游离脂肪酸。荧光检测的激发波长和发射波长分别为260 nm和380 nm。线性回归系数大于0.9996，检测限为26.19～76.67 fmol。所建立的方法具有良好的重现性，对实际样品的测定结果令人满意。

2-(2-Phenyl-1H-phenanthro-[9,10-d]imidazole-1-yl)-acetic acid (PPIA) and its application for determination of amines by high performance liquid chromatography with fluorescence detection and identification with mass spectroscopy/atmospheric pressure chemical ionization

A simple, sensitive, and mild method for the determination of amino compounds based on a condensation reaction with 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (EDC-HCI) as the dehydrant with fluorescence detection has been developed. Amines were derivatized to their acidamides with labeling reagent 2-(2-phenyl-1H-phenanthro-[9,10-d]imidazole-1-yl)-acetic acid (PPIA). Studies on derivatization conditions indicated that the coupling reaction proceeded rapidly and smoothly in the presence of a base catalyst in acetonitrile to give the corresponding sensitively fluorescent derivatives with an excitation maximum at lambda(ex) 260nm and an emission maximum at lambda(em) 380nm. The labeled derivatives exhibited high stability and were enough to be efficiently analyzed by high-performance liquid chromatography. Identification of derivatives was carried out by online post-column mass spectrometry (LC/APCI-MS/MS) and showed an intense protonated molecular ion corresponding m/z [MH](+) under APCI in positive-ion mode. At the same time, the fluorescence properties of derivatives in various solvents or at different temperature were investigated. The method, in conjunction with a gradient elution, offered a baseline resolution of the common amine derivatives on a reversed-phase Eclipse XDB-C-8 column. LC separation for the derivatized amines showed good reproducibility with acetonitrile-water as mobile phase. Detection limits calculated from 0.78 pmol injection, at a signal-to-noise ratio of 3, were 3.1-18.2 fmol. The mean intra- and inter-assay precision for all amine levels were < 3.85% and 2.11%, respectively. Excellent linear responses were observed with coefficients of > 0.9996. The established method for the determination of aliphatic amines from real wastewater and biological samples was satisfactory. (c) 2006 Elsevier B.V. All rights reserved.

Discurso pronunciado por el Sr. Conde de Reus, en el senado español los días 9, 10 y 11 de diciembre último, al discutirse el proyecto de contestación al de la corona.

UANL

Clarinete. Secuenciación de contenidos y unidades didácticas para escuelas de música II : niveles V, VI, VII, VIII, IX (7,8,9,10,11 años).

Resumen tomado de la publicación

II Jornadas Regionales de Did??ctica de las matem??ticas : Zamora, 8, 9, 10 y 11 de septiembre de 1987

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