A Conjugated Polymeric Supramolecular Network with Aggregation‐Induced Emission Enhancement: An Efficient Light‐Harvesting System with an Ultrahigh Antenna Effect

Superior artificial light‐harvesting systems (ALHSs) require exceptional capacity in harvesting light and transferring energy. In this work, we report a novel strategy to build ALHSs with an unprecedented antenna effect (35.9 in solution and 90.4 in solid film). The ALHSs made use of a conjugated polymeric supramolecular network (CPSN), a crosslinked network obtained from the self‐assembly of a pillar[5]arene‐based conjugated polymeric host ( CPH ) and conjugated ditopic guests (Gs). The excellent performance of the CPSN could be attributed to the following factors: 1) The “molecular wire effect” of the conjugated polymeric structure, 2) aggregation‐induced enhanced emission (AEE) moieties in the CPH backbone, and 3) high capacity of donor–acceptor energy transfer, and 4) crosslinked structures triggered by the host–guest binding between Gs and CPH . Moreover, the emission of the CPSN could be tuned by using different Gs or varying the host/guest ratio, thus reaching a 96 % sRGB area.     

压力变化对再结晶石墨的影响

 用电子显微镜观察了不同压力下催化剂合金中花瓣状、类球状、片状再结晶石墨含量，晶粒形貌随压力变化的情况。得到如下结论：在高温高压条件下，利用过渡族金属合金作催化剂，在石墨向金刚石转化过程中，类球状再结晶石墨的存在是不可缺少的环节。     

静电陀螺转子位移测量电路的研究

—静电陀螺转子位移测量电路是静电陀螺支承系统的重要部件。它直接影响转子在电极球腔中的失中度，从而导致陀螺漂移。因此在温度变化及电磁干扰情况下，必须提高测量电路的分辨率和零位稳定性。本文在理论分析和实验研究的基础上，提出参数优化设计方法和模块化结构设计。实验结果表明所研制的电路性能良好，工作稳定度达到了高精度静电陀螺仪的要求。     

Simultaneous analysis of six cardiovascular drugs by capillary electrophoresis coupled with electrochemical and electrochemiluminescence detection,using a chemometrical optimization approach

CE coupled with dual electrochemical (EC) and electrochemiluminescence (ECL) detection was optimized for simultaneous analysis of six cardiovascular drugs (alprenolol, propafenone, acebutolol, verapamil, atenolol and metoprolol) via central composite design. Following this study, three critical electrophoretic factors governing the CE separation were investigated: Tris‐H₃PO₄ buffer concentration, buffer pH value and separation voltage. A modified chromatographic response was adopted for evaluating CE separation quality. Optimum conditions were achieved using Tris‐H₃PO₄ buffer 35.6 mM (pH 2.3) separated at 13.9 kV, which was employed experimentally and led to the successful simultaneous separation of the above six drugs. The good agreement of the chromatographic response was observed between predicted data and actual experimental results using these optimized conditions (RSD=3.75%). The proposed method was validated for linearity, repeatability and sensitivity, and subsequently successfully applied to determine six basic drugs in urine samples.     

10,10-二吡啶甲基-9,10-二氢蒽的合成研究

蒽酮1和氯甲基吡啶盐酸盐2在甲苯中回流反应生成10,10-二吡啶甲基-9(10H)蒽酮(3),收率63％～68％;3用硼氢化钠还原生成10,10-二吡啶甲基-9,l0-二氢蒽-9-醇(4),收率87％～90％;蒽醇4在酸催化下发生歧化反应,得到还原产物10,10-二吡啶甲基-9,10-二氢蒽(5)和氧化产物蒽酮3.该歧化反应受催化剂、溶剂和反应温度等影响.当蒽醇4用三氟化硼为催化剂、甲苯为溶剂、回流反应,5的收率达到74％.所合成的新化合物都经1H NMR,13C NMR,MS和元素分析表征确认.     

聚乙二醇-水介质中水溶性膦稳定的钌催化芳香酮的不对称加氢反应

在聚乙二醇-400-水介质中,以(1S,2S)-1,2-二苯基乙二胺的磺酸钠盐为手性修饰剂,考察了水溶性三(间-磺酸钠苯基)膦稳定的Ru催化苯乙酮及其衍生物的不对称加氢反应.结果表明,该催化剂体系具有良好的催化活性和对映选择性.在优化反应条件下,苯乙酮转化率和对映选择性分别为100％和84.9％.经正己烷萃取后,催化剂...     

Synthesis of heterocyclic homotriptycenes

A series of novel heterocyclic homotriptycenes bearing furan, thiophene, and pyridine rings, 7a-f, were synthesized by intramolecular dehydration reactions of 10,10-dihetarylmethyl-9,10-dihydroanthracen-9-ols 6a-f. In the presence of acids, the secondary alcohols 6a-f show different reactions which depend on the electron densities of the attached heterocyclic rings. The initially formed carbenium ions react in an electrophilic substitution with electron-rich heterocycles. The formation of a transannular bridge (1,7-elimination) leads to homotriptycenes in high yields. When the heterocyclic ring has a moderate electron density, two competitive reactions exist, which afford 9-monosubstituted anthracenes by 1,4-elimination or 9,10-disubstituted anthracenes by a rearrangement, respectively. Electron-deficient heterocycles undergo a disproportionation to give hydrocarbons and ketones.     

On Quadratic Twists of Elliptic Curves and Some Applications of a Refined Version of Yu's Formula

In this article, we study some cohomology groups and quadratic twists of elliptic curves, and apply Tate local duality and the results of Kramer–Tunnell on local norm cokernel to give a refined version of Yu's formula in the case of elliptic curves. Then, by using this refinement formula, we obtain explicit orders of Shafarevich–Tate groups of some elliptic curves in quadratic number fields, including a few unconditional cases.