温和条件原位配体反应合成铁四氮唑配合物及其晶体结构

利用2-氰基吡啶与叠氮阴离子,在开放体系、温和条件下发生Demko-Sharpless原位配体反应,合成得到铁四氮唑配合物[Fe(2-PTZ)₂(H₂O)₂]。该配合物为单核结构,其晶体属单斜晶系,P2₁/c空间群。配合物通过分子间的氢键及错位的面对面π-π堆积作用形成三维超分子体系。     

中性红与小牛胸腺DNA相互作用机理的电化学和紫外-可见光谱研究

静电作用;嵌插作用;中性红与小牛胸腺DNA相互作用机理的电化学和紫外-可见光谱研究     

单冠醚取代不对称酞菁LB膜的制备和表征

酞菁化合物有序聚集体已成为材料化学中的研究热点［１,２］,在酞菁分子中引入冠醚会大大改善酞菁化合物的气敏性,在提高响应速度和重复性的同时,其响应温度可降到室温［３,４］．研究冠醚酞菁气敏性质的通常方法是将其制成浇铸膜［４］,这种膜是无序的．膜中分子的...     

Exciting rogue waves,breathers, and solitons in coherent atomic media

We propose a scheme that excites rogue waves via electromagnetically induced transparency(EIT), which can also excite breathers and solitons. The system is a resonant Λ-type atomic ensemble. Under EIT conditions, the envelope equation of the probe field can be reduced to several different models, such as the saturable nonlinear Schr?dinger equation(SNLSE), and SNLSE with the trapping potential provided by a far-detuned laser field or a magnetic field. In this scheme, rogue waves can be generated by different initial pulses, such as the Gaussian wave with(or without) the uniform background. The scheme can be used to obtain rogue waves,breathers and solitons. We show the existence regions of rogue waves, breathers, and solitons as the function of the amplitude and width of the initial pulse. The novelty of our paper is that, we not only show rogue waves in the integrable system numerically, but also present the method to generate and control rogue waves in the non-integrable system.     

柑橘品质的近红外光谱无损检测

选择不同谱区范围的近红外光谱,利用偏最小二乘法对柑橘中总酸、总糖和维生素三种组分建立数学预测模型并进行优化,三种组分的化学值与近红外预测值的相关决定系数分别为:总酸r2=0.959,总糖r2=0.970和维生素C r2=0.973,所建模型具有实际应用价值.     

各向异性量子点单光子发射的高偏振度特性

研究了线偏振脉冲光场激发下,单个各向异性InGaAs量子点的高偏振光发射. 给出其偏振因子与两个正交本征态之间的交叉弛豫之间的关系式. 分析表明，交叉弛豫随激发场强度增大，并导致偏振因子随激发场入射脉冲面积减小. 关键词： 量子点 单光子发射 偏振度     

黄褐毛忍冬中主皂苷成分的结构解析

报道了黄褐毛忍冬中的两个皂苷主成分, 其中化合物1为新化合物, 并对另一个含量最高的皂苷结构进行了修正.     

基于聚集荧光增强体系的掺杂纳米粒子的可调控荧光发射与能量传递性质研究

通过再沉淀法制备了平均粒径200 nm左右的N,N'-双[4-(2'-苯并噻唑)-3-羟苯基]-5-叔丁基异酞酰胺(DHBIA)有机纳米粒子. 纳米粒子呈现出明显的聚集诱导荧光增强(AIEE)性质. 基于DHBIA聚集体的强荧光发射强度, 当其中掺杂有红光发射化合物N,N'-双[(4-二苯胺)-苯甲醛缩]二氨基马来腈(PBDM)作为能量受体时, 可清楚地观察到掺杂纳米颗粒中两种组分间的能量传递现象. 结果表明: 通过改变分子PBDM在体系中的掺杂浓度, 可实现对体系发光由绿色到红色的调控.     

Temperature-dependent cross sections for meson–meson nonresonant reactions in hadronic matter

We present a potential of which the short-distance part is given by one gluon exchange plus perturbative one- and two-loop corrections and of which the large-distance part exhibits a temperature-dependent constant value. The Schrödinger equation with this temperature-dependent potential yields a temperature dependence of the mesonic quark–antiquark relative-motion wave function and of meson masses. The temperature dependence of the potential, the wave function and the meson masses brings about temperature dependence of cross sections for the nonresonant reactions $\pi \pi \to \rho \rho$ for $I=2$, $KK\to K^{*}{K}^{*}$ for $I=1$, $K{K}^{*}\to K^{*}{K}^{*}$ for $I=1$, $\pi K\to \rho K^{*}$ for $I=3/2$, $\pi K^{*}\to \rho K^{*}$ for $I=3/2$, $\rho K\to \rho K^{*}$ for $I=3/2$ and $\pi K^{*}\to \rho K$ for $I=3/2$. As the temperature increases, the rise or fall of peak cross sections is determined by the increased radii of initial mesons, the loosened bound states of final mesons, and the total-mass difference of the initial and final mesons. The temperature-dependent cross sections and meson masses are parametrized.     

新显色剂3,5-二(1-羧基-4,5-二甲氧基-2-苯氨基偶氮基)苯甲酸与铜(Ⅱ)的显色反应

研究了新显色剂3,5-二(1-羧基-4,5-二甲氧基-2-苯氨基偶氮基)苯甲酸(CDMOBAABA)与铜(Ⅱ)的显色反应。在TritonX-100存在下,于pH9.5的NH3-NH4Cl缓冲介质中,CDMOBAABA与铜(Ⅱ)形成棕红色配合物。试剂与络合物的最大吸收波长分别为450nm和540nm。表观摩尔吸光系数为2.43×105L·mol-1.cm-1。铜(Ⅱ)含量在0—20μg/25mL范围内符合比耳定律。该方法用于铝合金样品中铜的测定,结果与原子吸收光谱法相吻合,相对标准偏差1.89%。