Geochemical variability of copper and iron in Oman Margin sediments

An analysis of the geochemical distribution of selected trace metals among various geochemical phases of the sediments in the Oman Margin was carried out using a sequential extraction technique. The present study showed that most Cu in abyssal sediment is associated with only oxidisable mainly organic and sulphide bound metals with insignificant bound to exchangeable, carbonates, easily/moderately reducible fraction. The preservation of Cu in the sediments indicates the importance of primary production and upwelling in the overlying waters and an organic flux in the sedimentary deposition of open-ocean environments. The early diagenetically formed oxidisable mainly organic and sulphide fraction are not degraded and results in a pronounced association of Cu with organic fraction in the sediments of the Oman continental margin. The strong correlation between Cu, TOC and Fe oxides associated with the oxidisable fraction in one of the core indicates that it is likely to be the presence of sulphides.     

Ionic liquid-mediated bis[(3-methyldimethoxysilyl)propyl] polypropylene oxide-based polar sol–gel coatings for capillary microextraction

Two ionic liquids (IL), namely, 1-methyl-3-octylimidazolium chloride (MOIC) and trihexyltetradecylphosphonium tetrafluoroborate (TTPT) were used to prepare polar and nonpolar sol–gel coatings for capillary microextraction (CME). Bis[(3-methyldimethoxysilyl)propyl] polypropylene oxide (BMPO), containing sol–gel active terminal methoxysilyl groups and polar propylene oxide repeating units, was used to prepare polar sol–gel hybrid organic–inorganic coatings. Hydroxy-terminated poly(dimethyl-co-diphenylsiloxane) was used as the sol–gel active organic component for nonpolar sol–gel hybrid coatings. Compared to a sol–gel BMPO coating prepared without IL, the sol–gel BMPO coatings prepared with the use of both of these ILs provided more efficient extraction as is evidenced by more pronounced GC peak areas. The MOIC-mediated sol–gel BMPO coating provided larger GC peak areas compared to the TTPT-mediated sol–gel BMPO coating. Scanning electron microscopy results suggested that MOIC provided a more porous morphology of the sol–gel BMPO extraction media compared to that prepared with TTPT. Thus, individual ILs can affect the porosity of sol–gel materials to different degrees. Overall, the sol–gel BMPO coating prepared with the ILs could extract nonpolar to polar analytes directly from aqueous samples. Detection limits were on the order of nanograms per liter (1.9–330.5 ng/L) depending on the analyte class. Furthermore, the MOIC-mediated sol–gel BMPO coating demonstrated high thermal stability (330 °C), solvent resistance, and fast extraction equilibrium (10–15 min) for polar and moderately polar analytes.     

面向工程教育专业认证的有机化学实验微课混合式教学模式探索

According to the latest requirements of engineering education professional certification of chemical engineering and technology specialty on organic chemistry laboratory, current situation and problems of organic chemistry laboratory in Jianghan University are discussed from the perspective of teaching mode, teaching content, teachers and students. This paper has explored the blended teaching mode combining the online teaching with the traditional teaching. This teaching mode is successfully applied to the course of organic chemistry laboratory. It has been proved that this teaching mode improved the teaching quality, enhanced the classroom efficiency, achieved the teaching objectives, as well as met the requirements in the engineering education professional certification.     

迁移率对单层有机发光器件中复合率分布的影响

以载流子运动的扩散-漂移理论为基础,利用数值方法研究了有机发光层中双极载流子注入时的电势、电场、载流子浓度和复合率分布.结果表明:当两种载流子的迁移率相同实现平衡注入,并且当空穴和电子的复合为Langevin型时,复合率的分布曲线相当理想,参与复合的空穴和电子总量远大于其他情况,由此器件的发光性能也得到更大的优化.     

蓝光有机存储染料研究进展

近年来,蓝光有机存储染料作为超高密度存储技术的核心已经日益受到人们的广泛关注,出现了与之相关的大量专利文献报道.本文介绍了卟啉染料、偶氮染料、菁染料、芪类染料和香豆素衍生物染料等蓝光染料的合成及应用,并对蓝光有机存储染料的发展趋势作了展望.     

Paramagnetic pyrrole-based semiconductor molecular material

The electrochemical oxidation of hexa-N-pyrrolylbenzene in organic media leads, via intramolecular coupling of the pyrrole residues, to the deposition of a molecular semiconductor film on an electrode surface. In situ electron spin resonance–electrochemical experiments reveal that the semiconductor is endowed with both properties of conducting polymers (i.e., reversible oxidation) and polyaromatic molecular materials (i.e., highly paramagnetic). The material, which is easy to process as soft homogeneous thin film, shows a tunable 0 to 1 spin concentration per molecule at room temperature by controlling the electrochemical potential. Contribution to the Fall Meeting of the European Materials Research Society, Symposium D: 9th International Symposium on the Electrochemical–Chemical Reactivity of Metastable Materials, Warsaw, 17th–21st September, 2007. An erratum to this article can be found at     

quiral: a computer program for the synthesis of chiral molecules from sugars

The quiral computer program analyzes the 3D structure of a target organic molecule to find which sugar(s) can be used as a starting material for its synthesis. The program also proposes schemes for the preparation of rare or unavailable sugars whose chiral centers fit with those of the target molecule. Castanospermine, an anti-HIV natural compound is chosen as an example to illustrate what the quiral program achieves.