金属螺旋三角形穴状化合物的组装及其对氨基葡萄糖的识别研究

利用含有丹磺酰胺荧光团和氢键作用位点的双三齿(N₂O)有机配体H₂L¹[(N-(3,5-双(2-(2-吡啶亚甲基)甲酰肼基))苯基)-5-(二甲基氨基)萘-1-磺酰胺]与Zn²⁺构筑金属螺旋三角形穴状化合物MC-1. 通过荧光光谱、紫外光谱和ESI-MS测试及¹H NMR 测定, 研究其对氨基葡萄糖和葡萄糖的识别与传感. 结果表明, MC-1 对氨基葡萄糖具有良好的荧光和紫外双重响应, 而对葡萄糖却没有任何响应, 且MC-1 能够1:1 包合氨基葡萄糖, 平衡常数lgK_ass=7.23±0.03.     

Adaptive output feedback control of uncertain nonlinear chaotic systems based on dynamic surface control technique

In this paper, an adaptive output feedback control algorithm based on the dynamic surface control (DSC) is proposed for a class of uncertain chaotic systems. Because the system states are assumed to be unavailable, an observer is designed to estimate those unavailable states. The main advantage of this algorithm can overcome the problem of “explosion of complexity” inherent in the backstepping design. Thus, the proposed control approach is simpler than the traditional backstepping control for the uncertain chaotic systems. The stability analysis shows that the system is stable in the sense that all signals in the closed-loop system are uniformly ultimately bounded (UUB) and the system output can track the reference signal to a bounded compact set. Finally, an example is provided to illustrate the effectiveness of the proposed control system.     

褪色光度法测定微量铁的新体系

系统地研究了9-(邻羧基苯基)-6-羟基-3H-呫吨酮-3(FL)与Fe~(2 )、Tween-80褪色反应测定铁的光度条件。试验表明,在HOAc-NaOAc缓冲溶液中和非离子表面活性剂Tween-80存在的条件下,体系吸光度明显降低,利用这一现象可直接测定铁,其表观摩尔吸光系数为8.4×10~4,线性范围0.5～9.0μg/25ml,方法选择性较高,一定量的常见离子不干扰测定,可直接用于矿泉水中铁的测定。     

Explicit ultimate bound sets of a new hyperchaotic system and its application in estimating the Hausdorff dimension

The robust adaptive fuzzy control problem is investigated for a single machine bus system with static var compensator (SVC). This design does not require that speed of the generator rotor and susceptance of the overall system are measured, and also does not require that the parameters of controlled system are known accurately. The fuzzy logic systems are used to approximate the nonlinear functions of the system, and a fuzzy state observer is designed to estimate the speed of the generator rotor and susceptance. By utilizing the fuzzy state observer, and combining the adaptive backstepping technique with adaptive fuzzy control design, an observer-based adaptive fuzzy output-feedback control approach is developed. It is proved that the proposed control approach can guarantee that all the signals in the closed-loop system are semiglobally uniformly ultimately bounded (SGUUB), and the angle of the generator rotor follows a desired value. Simulation results are presented to show the effectiveness of the approach.     

Utilization of ultrasonic irradiation as a green and effective strategy to prepare poly(N-vinyl-2-pyrrolidone)/modified nano-copper (II) oxide nanocomposites

The present paper describes the result of investigations into preparation of novel nanocomposites (NCs) based on poly(N-vinyl-2-pyrrolidone) (PVP) as a biocompatible polymer and modified copper (II) oxide nanoparticles (NPs) as a nano-filler. To achieve optimum NCs properties, different ratios of modified copper (II) oxide NPs (3, 5, and 7 wt%) were used to fabricate PVP NCs and also the ultrasonic irradiation was utilized to perform these processes as a fast and effective method. Subsequently, the structure of the obtained nanohybrids was characterized by various techniques. The suitable incorporation between PVP matrix and modified CuO NPs can be seen from the FT-IR spectra. The obtained NCs indicated an efficient thermal improvement in comparison to the pristine polymer. Also, the uniform dispersion of modified CuO NPs in the PVP matrix was detected by FE-SEM and EDX. According to UV absorption spectra, it is clear that these NCs can be used in UV protecting applications.     

High yield preparation of a novel tetrakis[ruthenium tris(bipyridine)]calix[6]arene derivative with good diastereomeric purity

In order to develop methodology for the selective preparation of complex molecular structures with potential photochemical or electron transfer functions, the diastereoselective synthesis of multiple ruthenium tris(bipyridine) complexes tethered to a central calix[6]arene core was investigated. Applying recently developed methodology, the resolved precursor cis-Δ-[Ru(bpy)₂(DMSO)Cl]PF₆ (98.6% ee) was efficiently reacted with a novel calix[6]arene derivative, to give the tetrakis[Ru(bpy)₂(bpy′)]calix[6]arene derivative (9) with almost complete retention of absolute stereochemistry at each of the four metal centres, as seen by the unusually strong molar circular dichroism (CD) spectrum. The synthesis of racemic 9 was also carried out, and demonstrated to have an inactive CD spectrum.     

反相离子对高效液相色谱法分离测定钪、锡和铝

 以 1,2 二苯乙烯 4,4′ 双 (1 偶氮 ) 3,4 二羟基苯 2 ,2′ 二磺酸铵 (芪唑 )为柱前衍生试剂 ,采用反相离子对高效液相色谱法分离和测定钪、锡和铝。在C18柱上 ,用含 2 0mmol/LHAc NaAc缓冲溶液 (pH 6 0 )和 10mmol/L十二烷基磺酸钠的甲醇水溶液作流动相 ,检测波长 5 0 0nm ,同时分离测定了钪、锡和铝的络合物。钪、锡和铝的检出限分别为 0 9μg/L ,1 0 μg/L和 1 2 μg/L ,此方法用于矿石样品分析获得满意结果。     

Diastereoselective synthesis of β- and γ2-muurolene: a carbocationic pathway from mono- to sesquiterpenes

The Lewis acid catalysed addition of the piperityl chlorides6 to isoprene yields adduct7, which undergoes a cis-stereoselective cyclisation to give the diastereoisomeric muurolene monohydrochlorides8. Treatment with potassium tert-butoxide affords β- and γ₂- muurolene 2.     

A New polyamine synthesis.

A new flexible method for the step by step construction of polyamines based on the reaction of dichloroboranes with azides is reported.