Addition of alkynes and osmium carbynes towards functionalized dπ-pπ conjugated systems

碳-碳三键和碳-金属三键是两类高度不饱和的化学键。该工作发现了这两类三键之间的全新反应模式。利用该反应能把金属和有机π共轭体系有效结合，得到一类金属d轨道参与π共轭的全新大π共轭体系。化学化工学院夏海平教授课题组碳龙化学研究取得新进展，利用金属卡拜与炔烃的新反应，成功地合成了一类金属d轨道参与π共轭的全新共轭体系并在有机太阳能电池领域得到应用。该工作是在夏海平教授和南方科技大学何凤副教授共同指导下完成的。化学化工学院2016级iChEM博士生陈仕焰和南科大博士生刘龙珠为论文的共同第一作者。该工作充分体现了多学科协同创新研究优势：相关化合物合成、表征由陈仕焰、高翔、彭丽霞、张颖等完成；光电测试由刘龙珠完成；理论计算由陈仕焰、华煜晖完成。化学化工学院杨柳林副教授、谭元植教授等对研究工作给予了大力支持。【Abstract】The metal-carbon triple bonds and carbon-carbon triple bonds are both highly unsaturated bonds. As a result, their reactions tend to afford cycloaddition intermediates or products. Herein, we report a reaction of M≡C and C≡C bonds that affords acyclic addition products. These newly discovered reactions are highly efficient, regio- and stereospecific, with good functional group tolerance, and are robust under air at room temperature. The isotope labeling NMR experiments and theoretical calculations reveal the reaction mechanism. Employing these reactions, functionalized dπ-pπ conjugated systems can be easily constructed and modified. The resulting dπ-pπ conjugated systems were found to be good electron transport layer materials in organic solar cells, with power conversion efficiency up to 16.28% based on the PM6: Y6 non-fullerene system. This work provides a facile, efficient methodology for the preparation of dπ-pπ conjugated systems for use in functional materials.This research was supported by the National Natural Science Foundation of China (Nos. U1705254, 21931002, and 21975115), Guangdong Provincial Key Laboratory of Catalysis (No. 2020B121201002), Shenzhen Nobel Prize Scientists Laboratory Project (no.C17783101), and the National Key R&D Program of China (2017YFA0204902). We thank the SUSTech Core Research Facilities for the Holiba-UVISEL measurements. 研究工作得到了国家自然科学基金(U1705254、21931002、21975115)，广东省催化化学重点实验室(No. 2020B121201002)，国家重点研发计划(2017YFA0204902)，及深圳诺贝尔奖科学家实验室(C17783101)等项目资助

Structural characterization of magnetic cassava-starch microspheres and their application in adsorption of lysozyme

磁性微球是高分子材料与磁性物质通过一定作用复合而成的一类具有特殊功能的磁性高分子微球。以木薯淀粉为原材料,复合共沉淀法制备的改性磁流体Fe3O4,采用两步法（化学交联法）制备木薯淀粉磁性微球。利用傅里叶变换红外光谱仪、X射线衍射仪、同步热分析仪、扫描电镜、激光粒度仪、磁天平等对其性能及结构进行表征并研究其对溶菌酶的吸附行为。通过单因素法考察磁性微球用量、溶液pH值、吸附温度、吸附时间对吸附率的影响,并采用准一级动力学模型和准二级动力学模型研究其吸附动力学。结果表明：制备的木薯淀粉磁性微球Fe_3O_4含量为19.71%,D50（中位径）为15.40μm,磁化率为1.571×10-3cm~3/g,形貌规整;在微球用量为1.25g,溶液pH=10,吸附温度为25℃,吸附时间为80min时,微球对溶菌酶的吸附率最高,达到84.67%。以相关系数R2为参考,准二级动力学模型（R2=0.99993）较准一级动力学模型（R~2=0.99174）、颗粒内扩散模型（R~2=0.69996）能更好描述木薯淀粉磁性微球对溶菌酶的吸附行为。The magnetic cassava starch microspheres have been prepared using Fe_3O_4 and cassava starch as starting materials. Fourier transform infrared spectrum,X-ray diffraction,thermal analyzer,scanning electron microscope,laser granulometer,and magnetic balance were used to characterize the product. The adsorption behavior of lysozyme on these microspheres was studied. The influence of magnetic microsphere dosage,solution p H,adsorption temperature and time on the adsorption efficiency was evaluated by single factor experiments. The results showed that magnetic starch microspheres contain 19.71% of Fe_3O_4,with D50（median diameter） of 15.40μm,and magnetic susceptibility of 1.571×10~（-3）cm~3/g. When the dosage of microspheres was 1.25 g,with solution p H value of 10,adsorption temperature of 25℃,adsorption time of 80 min,the best adsorption efficiency of lysozyme on the microsphere was 84.67%. Based on the correlation coefficient R~2,the adsorptionrate can be better described by pseudo-second-order kinetics（R~2=0.99997） than by pseudo-first-order kinetics（R~2=0.99174）,and the particle diffusion model（R~2=0.69996）.广西高校人才小高地建设创新团队计划(桂教人[2011]47号);广西自然科学基金面上项目(2013GXNSFAA019037);广西高校科学技术研究项目(2013YB072);广西民族大学研究生教育创新计划(gxun-chxs2015084);广西民族大学-广西化工研究院研究生联合培养基地专项资金(BYB-014);广西壮族自治区大学生创新创业训练计划(201410608048)项

CMOS集成电路用Φ150-200mm外延硅材料

报道了Φ150mm CMOS硅外延材料的研究开发及集成电路应用成果，对Φ200mmP/P~-硅外延材料进行了初步探索研究。Φ150mm P/P~+硅外延片实现了批量生产，并成功应用于集成电路生产线，芯片成品率大于80%。硅外延片的参数指标能满足集成电路制造要求

岭南东江流域碧寿洞哺乳动物化石再研究

南岭以南（简称“岭南”）广 东 东 江 流 域 河 源 地 区 东 源 县 上 莞 镇 的 碧 寿 洞，经２００８ 年 再 次 考 察 与 发 掘，新发现哺乳动物化石１１属１１种。这是继２０００年之后又一次重要发现，现已总计达６目２１属２１种。经研究， 其属末次间冰期 ＯＩＳ５ａ大熊猫－剑齿象动物群。该动物群的组成特别是其中典型热带成员中国犀、华南巨獏、长臂 猿的存在，反映了当时的热带雨林环境。而化石层位土状堆积物的硅铝系数也在一定程度上指示了该动物群生存 时期的这种气候环境。由此表明，ＯＩＳ５ａ时东江流域及至岭南的南亚热带范围曾经发生过热带气候向北较大幅度 移动的重大环境变迁