有机溶剂热生长技术合成碱金属硒化物Cs2PdSe16及其热稳定性的研究

以PdCl₂,Cs₂Se及Se为原料在乙二胺溶液中用有机溶剂热生长技术(SolvothermalTechnique)制备碱金属硒化物Cs₂PdSe₁₆,用单晶X射线衍射技术对其进行晶体结构分析.Cs₂PdSe₁₆属四方晶系,空间群为P4b₂,晶胞参数为:a=1.2601(2)nm,b=1.2601(2)nm,c=0.7044(1)nm,V=1.1185(3)nm₃,Z=2,R=0.0514,wR=0.0991.该晶体由相互交错的[CsPd(Se₄)₂]^-层和[CsSe₈]⁺层组成.热分析结果表明,其分解温度为334℃.     

三对角对称矩阵特征值反问题

讨论了由四个特征对构造相应的三对角对称矩阵或Jacobi矩阵问题,得到了问题有唯一解的充要条件及解的表达式,并给出数值例子。     

毛细管电泳法检测蜂蜜中残留的抗生素

 用毛细管电泳法对 5种常用的抗生素四环素 (TC) ,土霉素 (OTC) ,多西环素 (DOC) ,金霉素 (CTC)和氯霉素 (CP)进行了分离。研究了电泳缓冲液的 pH、不同有机试剂添加剂、温度等因素对抗生素分离的影响。实验结果表明 ,体积分数为 4%的N 甲基吗啡啉的加入可大大改善分离效果。在各自相应的浓度范围内 ,峰面积和样品浓度之间呈现良好的线性关系 ,重现性好。氯霉素的检测极限为 10 μg/L ,四环素、土霉素、多西环素为 2 0 μg/L ,金霉素为 40 μg/L(信噪比 >5 )。该方法成功地应用于蜂蜜中残留抗生素的测定 ,具有操作简单、快速方便、灵敏度及自动化程度高。     

Photoinduced hydrogen abstraction‐coupling reaction mechanism of Δ5‐steroids with substituted 1, 4‐benzoquinones via electron transfer pathways

The photochemical reaction between three A⁵‐steroids (1–3) and a series of substituted 1,4‐benzoquinones and their mechanistic study were reported. The reaction in nitrogen atmosphere led to the formation of three products including the steroid‐quinone coupling compound (A), 7‐hydroxy derivatives of Δ⁵‐steroids (B) and substituted 1, 4‐hydroquinone (C). Both chemical and spectrometric evidences such as UV‐Visible spectra, ESR, chemically induced dynamic nuclear polarization (CIDNP) and cyclic voltammetry (CV) verified that the title reaction underwent a predominant photoinduced electron transfer pathway via the triplet quinone.     

Synthesis of 2-Substituted Hexahydro-1H-1,4-diazepine Analogues

Opioids have attracted increasing research interest, primarily because of their powerful pain relieving properties and their potential for recreational abuse1,2. In order to get some selectiveκ-opioid receptor agonists, which can elicit analgesia while lacking serious side effects, a series of hexahydro-1H-1,4-diazepine analogues carrying the segment of (1-arylacetamide-2-tertiaryamine) ethane have been synthesized in our laboratory. The κ-opioid receptor antagonistic activity3of these compo…     

二苯基锗二硫代氨基甲酸酯的合成及表征

合成了10种二苯基锗二硫代氨基甲酸酯Ph2Ge(S2CNR2)2,用元素分析、IR、^1H NMR和MS表征了这些化合物的结构,体外实验表明,这些化合物对MCF－7,WiDr和EC癌细胞具有较的抑制活性。     

串级非线性及其应用

文章介绍了串级非线性概念,讨论了串级过程及其物理思想,并指出了它的可能应用。     

Energy Level Statistics of SO（5） Limit of Super-symmetry U（6/4） in Interacting Boson-Fermion Model

We study the energy level statistics of the SO（5） limit of super-symmetry U（6/4） in odd-A nucleus using the interacting boson-fermion model. The nearest neighbor spacing distribution （NSD） and the spectral rigidity （Δ3） are investigated, and the factors that affect the properties of level statistics are also discussed. The results show that the boson number N is a dominant factor. If N is small, both the interaction strengths of subgroups SO^B（5） and SO^BF （5） and the spin play important roles in the energy level statistics, however, along with the increase of N, the statistics distribution would tend to be in Poisson form.     

端羟基聚环氧环己烷的合成

端羟基聚环氧环己烷的合成;端羟基聚环氧环己烷;环氧环己烷;阳离子聚合     

Nevanlinna theory through the Brownian motion

In this paper, we introduce the Nevanlinna theory using stochastic calculus, following the works of Davis(1975), Carne(1986) and Atsuji(1995, 2005, 2008 and 2017), etc. In particular, we give(another) proofs of the classical result of Nevanlinna for meromorphic functions and the result of Cartan-Ahlfors for holomorphic curves by using the probabilistic method.