Synergistic Effect of Graphdiyne-based Electrocatalysts

The synergistic effect can help improve the electrocatalyst performances by combining the advantages of individual components. In particular, such an effect has been more important in the atomic catalysts. In this review, we have summarized the synergistic effect of N, X co-doping graphdiyne[X=B, S, F or transition metal(TM)] electrocatalysts and graphdiyne-based dual-atom catalyst(GDY-DAC). In general, the synergistic cooperation between two different dopants in co-doped GDY and adjacent active sites in GDY-DAC not only promotes their catalytic activity but also greatly enhances the thermodynamic stability of the catalysts. For the N, X co-doping GDY electrocatalysts, doping the heteroatoms like boron, sulphur, phosphorus, and fluorine with nitrogen can further tune the charge density distribution and electronic structure. Meanwhile, the electron exchange between two doping atoms and GDY substrate has been discussed, where the TM-based GDY-DAC is a very promising catalyst for electrocatalysis. More importantly, electronic interactions between different elements on GDY have been carefully discussed. In the end, we have also supplied perspectives to the future developments of the GDY-based electrocatalysts.     

Low-energy neutrino and dark matter physics with sub-keV germanium detectors

The TEXONO-CDEX Collaboration (Taiwan experiment on neutrino?CChina dark matter experiment) explores high-purity germanium (HPGe) detection technology to develop a sub-keV threshold detector for pursuing studies on low mass weakly interacting massive particles (WIMPs), properties of neutrino and the possibilities of neutrino-nucleus coherent scattering observation. This article will introduce the facilities of newly established China Jing-Ping Underground Laboratory (CJPL), preliminary result of cosmic ray background studies at CJPL, the dark matter studies pursued at Kuo-Sheng Neutrino Laboratory (KSNL) and research efforts to accomplish our physics goals.     

近红外染料Yb(P4)(CoP) 掺杂 PS/SiO2复合纳米荧光标记物的制备及其性能

利用苯乙烯与3-甲基丙烯酰氧基丙基三甲氧基硅烷(KH570)化学反应合成共聚前驱物, 再采用凝胶-溶胶法,与四乙氧基硅烷在一定的条件下共同水解与缩合,合成了近红外染料 合镱(Ⅲ)掺杂的聚苯乙烯/二氧化硅复合纳米粒子。这种制备染料掺杂复合纳米粒子的方法既克服了传统物理包埋方法染料容易泄漏的问题,又不受到化学键合方法对近红外染料分子性质的限制。用扫描电子显微镜表征该复合纳米粒子呈球形,大小均匀,直径约100 nm。所制得的纳米粒子荧光性质稳定,受外界环境的影响小,具潜在生物亲和性,是一种新型的近红外荧光标记物。     

Parton Momentum Distribution at the Moment of Jet-Parton Collisions

The early parton momentum distribution is extracted by using the STAR collaboration data of ridge particles associated with a near-side jet in centred AuAu collisions at √SNN = 200 GeV. The ridge particles are identified as medium partons kicked by the jet near the surface and they carry direct information on the parton momentum distribution at the moment of jet-patton collisions. The extracted patton momentum distribution has a thermallike transverse momentum distribution but a rapidity plateau structure with a relatively fiat rapidity distribution at mid-rapidities with sharp kinematic boundaries at large rapidities that depend on the transverse momentum.     

9,9-二(十六烷基)芴基二聚炔铂、金和汞配合物的合成与性质

用Hagihara脱氢卤代法合成了三种新的9,9-二(十六烷基)芴基二聚炔铂(d⁸)、金和汞(d¹⁰)化合物反式- [Pt(Ph)(PEt₃)₂C≡CRC≡CPt(Ph)(PEt₃)₂, [(PPh₃)AuC≡CRC≡CAu(PPh₃)]和[MeHgC≡CRC≡CHgMe] [R＝9,9-二(十六烷基)芴基]. 用¹H NMR, ¹³C NMR, ³¹P NMR, FT-IR, FAB-MS, UV-Vis, 荧光和磷光光谱对其进行了表征. 结果表明, 体系中的铂、金和汞产生的重原子效应可以有效地促进单线激发态S₁与三线激发态T₁的系间跃迁, 使标题化合物产生有机三线态发光.     

A minor new monoterpene glycoside from paeonia veitchii

A new flavone, 6, 2?-dihydroxy-5, 7, 8, 6?-tetramethoxyflavone, was isolated from the roots of Scutellaria baicalensis. Its structure was established on the basis of spectral evidences.     

Study on Interaction of L-Tryptophan with p-Sulfonatocalix[4]arene by Spectrofluorometry

A variety of analytical techniques have been employed to investigate the interaction of calixarene with amino acids including 1HNMR1, MALDI-MS2 and calorimetric titration3. Furthermore, spectrofluorometry is another excellent method for its convenience an…     

平面环辛四烯:分子结构操纵实例

环辛四烯为一不平面分子,一般相信,理论中的平面环辛四烯需要将一对不成对电子填入两个简并不成键轨道,因而引起之伪扬-泰勒效应,可使带 D_(8h)对称性之平面环辛四烯非平面化而成“船”形的结构。本文简单介绍加减电子法、带张力环稠合法、键长缩短法和金属螫合法四种可使不平面之环辛四烯成为平面方法。然而,随有机合成方法之不断进展,在将来可能出现更多改变环辛四烯不平面结构的方法。我们在此文章提出化合物98即为一个可使环辛四烯成为平面的例子。98之合成将成为有机合成化学家的一个新的挑战。     

三甲硅基醚的断裂研究

Sommer等[1]首次应用（Me3SiO）2SO2向醇羟基引人三甲硅基（TMS）以保护羟基以来，已发展出很多方便有效的向醇羟基引人TMS保护基团的方法[2]．通常，立体阻碍越小的醇，其羟基越容易被硅基化，而且该TMS保护基团也就越容易在酸或碱性条件下被水解脱除[2]我们在天然产物PrehisPanolone的合成中[3]，羟基r-丁烯酸内酯2是一个关键的中间体．如何脱除前体三甲硅基醚的r-丁烯酸内酯1中的TMS保护基团是一个关键的问题．我们采用四了基氟化铵（TBAF）[4]（A）、酸性水解[5]（B）、碱性醇解[6]（C）和三氟化硼乙醚溶液（BF3-Et2O）[7]…