色酮吡唑啉酮骨架拼接二氢查尔酮类化合物的合成

以色酮-吡唑啉酮合成子(1）为原料,在三级胺N,N-二甲基乙醇胺催化下,与查尔酮发生Michael加成反应,合成了10个新型的色酮吡唑啉酮骨架拼接二氢查尔酮类化合物3a~3j,产率79%~90%, dr值为6/1~10/1, 其结构经¹H NMR, ¹³C NMR和HR-MS（ESI-TOF）表征。化合物3b的相对构型由单晶培养确定。该类化合物含有连续两个立体中心,包括一个季碳中心,可以为生物活性筛选提供物质基础。     

2-羟基-1-萘醛缩2-氨基-4-硝基苯酚亚胺的合成及其阴离子识别性能

以2-羟基-1-萘醛和2-氨基-4-硝基苯酚为原料,通过缩合反应合成了阴离子识别受体2-羟基-1-萘醛缩2-氨基-4-硝基苯酚亚胺（R）,其结构经¹H NMR, ¹³C NMR和IR表征。采用UV-Vis和¹H NMR等研究了受体R对阴离子的识别性能。结果表明：受体R在乙腈中对F^-、 H₂PO₄^-和AcO^-表现出良好的UV0Vis识别能力,且对上述阴离子表现出裸眼识别性能。通过核磁滴定、紫外滴定、络合常数及Job曲线等对受体R的识别机理进行了研究。结果表明：受体R与阴离子通过分子间氢键结合形成主客体配合物,对F^-具有更好的结合能力（络合常数为2.503 × 10⁴ L/mol）,与阴离子以比例1/1相互结合。     

关于N-弱鞅和弱鞅不等式的一个注记

$N$-弱鞅($N$-demimartingales)是由Christofides引进的.Christofides指出均值为零的负相协(negatively associated)随机变量序列的部分和序列是$N$-弱鞅. 然而, 相关文献中引理2.1的证明有错误, 这就影响了其文后的结果引理2.2、定理2.1等. 在这篇注记中,修正了相关文献中的引理2.1, 作为应用, 推广了鞅和下鞅的一些结果.     

服务台可修的N-策略单重休假M/G/1排队系统的可靠性分析

本文研究服务台可修的N-策略单重休假M/G/1排队系统,假定服务台的寿命有负指数分布和修理时间有任意分布,通过使用全概率分解技术和拉普拉斯变换,讨论了服务台的首次失效时间分布、不可用度和故障频度等可靠性指标,获得了服务台的一系列可靠性结果.     

一种橙光磷光铱(Ⅲ)配合物的合成、晶体结构及光电性质研究

采用二氯甲烷为溶剂,无水碳酸钾为缚酸剂,在25℃温和条件下,以2-苯基-4-甲基喹啉铱(III)氯桥二聚体[(4m2pq)2Ir(μ-Cl)2Ir(4m2pq)2]和乙酰丙酮(Hacac)进行配位,反应合成了新型铱(Ⅲ)配合物[(4m2pq)2Ir(acac)]。通过核磁共振氢谱(1H NMR)、碳谱(13C NMR)、X射线单晶衍射等确定分子结构,利用紫外-可见吸收光谱、发射光谱对其光物理性质进行研究。结果表明:(4m2pq)2Ir(acac)的单晶结构属三斜晶系,空间群为P1;(4m2pq)2Ir(acac)在二氯甲烷溶液中呈橙光发射,发射峰为597 nm,磷光寿命0.33μs,量子效率达50.4%。以(4m2pq)2Ir(acac)为客体掺杂在CBP中,制备了结构为ITO/NPB(30 nm)/CBP:(4m2pq)2Ir(acac)(质量分数6%和8%,20 nm)/BCP(10 nm)/Alq3(20 nm)/LiF(1 nm)/Al(150 nm)的橙色磷光有机电致发光器件,器件的最大亮度达到39 667 cd/m2,发射峰位于597 nm,最大电流效率为14.2 cd/A,最大功率效率为8.1 lm/W。     

一个含苯并咪唑环的酰氨基硫脲NMR研究

该文合成了一个新的在医药方面具有潜在应用价值的含苯并咪唑环的酰氨基硫脲化合物,即4-(4-甲氧基苯基)-1-[2-(4-硝基苯氧基甲基)-苯并咪唑-1-基\]甲酰基氨基硫脲,并利用元素分析、IR和NMR对其结构进行了表征. 通过NOESY谱确定了其两种异构体(A和B)的构型,并利用2D NMR技术对它们的¹H NMR 和¹³C NMR谱进行了全归属,给出了相应的偶合常数和两种异构体的含量.     

Color-stable,reduced efficiency roll-off hybrid white organic light emitting diodes with ultra high brightness

High-brightness and color-stable two-wavelength hybrid white organic light emitting diodes (HWOLEDs) with the configuration of indium tin oxide (ITO)/ N, N, N, N-tetrakis(4-methoxyphenyl)-benzidine (MeO-TPD): tetrafluoro-tetracyanoqino dimethane (F4-TCNQ)/N,N-di(naphthalene-1-yl)-N,N-diphenyl-benzidine (NPB)/ 4,4-N,N-dicarbazolebiphenyl (CBP): iridium (III) diazine complexes (MPPZ) 2 Ir(acac)/NPB/2-methyl-9,10-di(2-naphthyl)anthracene (MADN): p-bis(p-N,N-di-phenyl-aminostyryl)benzene (DSA-ph)/bis(10-hydroxybenzo[h] quino-linato)beryllium complex (Bebq2)/LiF/Al have been fabricated and characterized. The optimal brightness of the device is 69932 cd/m2 at a voltage of 13 V, and the Commission Internationale de l'Eclairage (CIE) chromaticity coordinates are almost constant during a large voltage change of 6-12 V. Furthermore, a current efficiency of 15.3 cd/A at an illumination-relevant brightness of 1000 cd/m2 is obtained, which rolls off slightly to 13.0 cd/A at an ultra high brightness of 50000 cd/m2. We attribute this great performance to wisely selecting an appropriate spacer together with effectively utilizing the combinations of exciton-harvested orange-phosphorescence/blue-fluorescence in the device. Undoubtedly, this is one of the most exciting results in two-wavelength HWOLEDs up to now.     

Interaction and local magnetic moments of metal phthalocyanine and tetraphenylporphyrin molecules on noble metal surfaces

In order to understand the Kondo effect observed in molecular systems, first-principles calculations have been widely used to predict the ground state properties of molecules on metal substrates. In this work, the interaction and the local magnetic moments of magnetic molecules （3d-metal phthalocyanine and tetraphenylporphyrin molecules） on noble metal surfaces are investigated based on the density functional theory. The calculation results show that the dz2 orbital of the transition metal atom of the molecule plays a dominant role in the molecule-surface interaction and the adsorption energy exhibits a simple declining trend as the adsorption distance increases. In addition, the Au（111） surface generally has a weak interaction with the adsorbed molecule compared with the Cu（ll 1） surface and thus serves as a better candidate substrate for studying the Kondo effect. The relation between the local magnetic moment and the Coulomb interaction U is examined by carrying out the GGA＋U calculation according to Dudarev＇s scheme. We find that the Coulomb interaction is essential for estimating the local magnetic moment in molecule-surface systems, and we suggest that the reference values of parameter U are 2 eV for Fe and 2-3 eV for Co.     

Novel Wronskian Condition and New Exact Solutions to a （3＋1）-Dimensional Generalized KP Equation

Utilizing the Wronskian technique, a combined Wronskian condition is established for a （3＋1）-dimensional generalized KP equation. The generating functions for matrix entries satisfy a linear system of new partial differential equations. Moreover, as applications, examples of Wronskian determinant solutions, including N-soliton solutions, periodic solutions and rational solutions, are computed.