Low complexity carrier phase estimation for m-QAM optical communication systems

Photonic Network Communications - A low complexity carrier phase estimation (CPE) algorithm for M-ary quadrature amplitude modulation (m-QAM) optical communication systems is investigated in this...     

含2,3-二氯-5,6-二氰基对苯醌(DDQ)或其自由基离子(DDQ~)的多元配合物研究

通过联苯甲酰双缩肼（Ｌ）与不同金属乙酸盐［Ｍ（ＯＡｃ）２］及２，３－二氯－５，６－二氰基对苯醌自由基离子（ＤＤＱ－·）反应，合成了３个分子式为（ＭＬ）２＋（ＤＤＱ－·）２（Ｍ＝Ｍｎ、Ｚｎ、Ｃｄ）的三元配合物及２个分子式为（ＭＬ）２＋（ＤＤＱ－·）（ＯＡｃ－）（Ｍ＝Ｎｉ、Ｐｂ）的四元配合物．元素分析确定了它们的组成，经红外光谱、紫外－可见光谱及摩尔电导的测定对其配位情况进行了讨论．另将丁二酮双缩肼（Ｌ）与不同金属乙酸盐［Ｍ（ＯＡｃ）２］，及中性ＤＤＱ反应，合成了分子式分别为（ＭＬ）２＋（ＤＤＱ－·）（ＯＡｃ－）（Ｍ＝Ｃｕ、Ｃｄ）、（ＭＬ）２＋（ＤＤＱ）（ＯＡｃ－）２（Ｍ＝Ｃｏ、Ｎｉ）及（ＨｇＬ）２＋（ＤＤＱ）１．５（ＯＡｃ－）２的五个四元配合物．经元素分析、红外光谱、紫外－可见光谱，对它们进行了表征．固体电导的测定结果表明，含中性ＤＤＱ的配合物均属半导体范畴，其中Ｈｇ配合物的室温粉末固体电导率达３．７×１０－４Ω－１ｃｍ－１．     

Solid-phase synthesis of heterocycles via palladium-catalyzed annulation

Solid-phase linked o-iodoanilines (4) and o-iodophenol (9) reacted with 1,3- and 1,4-dienes in the presence of palladium acetate to generate highly substituted indolines, tetrahydroquinolines, hydrobenzofurans and hydrobenzopyrans, which provided an efficient way for making heterocyclic molecule libraries.     

Co-POM@MOF-derivatives with trace cobalt content for highly efficient oxygen reduction

A simple and effective method for constructing highly efficient oxygen reduction catalysts with trace amount of isolated cobalt was firstly developed by the pyrolysis of Co-centered polyoxometalate@metalorganic framework （Co-POM@MOF）.The Co-centered polyoxometalate ([Co W₁₂O₄₀]^6-) was confined in the well-defined void space of ZIF-8 to achieve homogeneous dispersion of polyoxoanions,where the isolated Co centers were well surrounded by the W-O shell and ZIF-8 fra...     

SYNTHESIS,CRYSTAL STRUCTURE AND ELECTROCHEMISTRY PROPERTIES OF Cu-COMPOUND BY RIGID LIGAND

Journal of Structural Chemistry - A new novel Cu(II) compound formulated as Cu(C4N6H4)2Cl2 (1) (C4N6H4 = 1H-3,4′-bi-1,2,4-triazole) is successfully synthesized by a...     

Helical supramolecular nanorods via sequential meticulous tailoring of noncovalent interaction and light irradiation

Polymers are widely recognized to entail random conformations in good solvent governed by the need for achieving the highest entropy to reach thermodynamic equilibrium. In this context, it remains grand challenging to directly arrange them into ordered conformation as building blocks for further self-assembling into hierarchal structures. Herein, we report a simple yet viable strategy to progressively assemble rationally designed azobenzene-containing alternating copolymer(i.e., poly(binaphthyls...     

Fura-2探针对希土Y3+跨PC12细胞膜行为研究

使用AR-MIC-CM阳离子测定系统,发展Fura-2荧光测定技术,将其应用于测定细胞内游离希土离子Y³⁺,并以此研究了Y³⁺跨PC12细胞(大鼠嗜铬细胞瘤细胞)膜的行为。结果表明：在模拟细胞内各离子组分,pH=7.05的溶液中,测得表观解离常数为4.5p mol·L^-1。对于PC12细胞,静息条件下Y³⁺不能跨越细胞膜进入胞内。与钙离子通道相关的KCl和去甲肾上腺素均不能刺激希土Y³⁺过膜。用Ouabain(哇巴因)使胞内Na⁺超载后,Y³⁺可过膜进入细胞内,且过膜量与胞外Y³⁺浓度和胞内Na⁺超载程度有一定的浓度依赖关系,提示Y³⁺可以经由Na⁺/Y³⁺交换机制过膜而进入细胞内。     

Facile Assembly of Benzo[b]naphtho[2,3‐d]azocin‐6(5 H)‐ones by a Palladium‐Catalyzed Double Carbometalation

The palladium‐catalyzed reaction of 2‐alkynylanilines with 2‐(2‐bromobenzylidene)cyclobutanone as an efficient route to 7,8‐dihydrobenzo[b]naphtho[2,3‐d]azocin‐6(5 H)‐ones was developed. The fused eight‐membered ring was constructed conveniently. During the reaction process, double carbometalation was involved, which resulted in excellent selectivity with the formation of three new bonds. This transformation is highly efficient and leads to fused polycycles in good to excellent yields with good functional group tolerance.     

Phosphine‐mediated Highly Enantioselective Spirocyclization with Ketimines as Substrates

Phosphine‐catalyzed enantioselective annulation reactions involving ketimines are a daunting synthetic challenge owing to the intrinsic low reactivity of ketimine substrates. A highly enantioselective [3+2] cycloaddition reaction that makes use of isatin‐derived ketimines as reaction partners was developed. Notably, both simple and γ‐substituted allenoates could be utilized, and various 3,2′‐pyrrolidinyl spirooxindoles with a tetrasubstituted stereocenter were obtained in excellent yields and with nearly perfect enantioselectivity (>98 % ee in all cases).     

Standard molar enthalpy of formation of [(C12H8N2)2Bi(O2NO)3] and its biological activity on Schizosaccharomyces pombe

The title complex [(C₁₂H₈N₂)₂Bi(O₂NO)₃] was synthesized by reaction of 1,10-phenanthroline (phen) and Bi(NO₃)₃·5H₂O. The structure of the complex was characterized by single-crystal X-ray diffraction, IR spectroscopy, and elemental analysis. An advanced solution-reaction isoperibol microcalorimeter was applied to determine the standard molar enthalpies of formation at 298.15 K of the complex and Bi(NO₃)₃·5H₂O, giving –(798.92 ± 5.99) and –(1986.87 ± 0.20) kJ mol⁻¹, respectively. The biological effect of the complex was evaluated by microcalorimetry on the growth of Schizosaccharomyces pombe (S. pombe). According to thermogenic curves, the corresponding thermokinetics and thermodynamic parameters were derived. The complex had good bioactivity on the growth metabolism of S. pombe, with the value of IC₅₀ being 2.8 × 10⁻⁵ mol L⁻¹.