Synthesis and Crystal Structure of 1,2-Bis-（p-nitrophenylsulfonamido）-4,5-dinitrobenzene

The title compound, 1,2-bis-(p-nitro-phenylsulfonamido)-4,5-dinitrobenzene, was synthesized and characterized by elemental analysis, IR and 1H NMR. A pale yellow prism crystal of C23H26N8O13S2 (Mr = 686.64) was obtained in DMF solution and determined by single-crystal X-ray diffraction method. It crystallizes in triclinic system, space group P1 with a = 10.346(4), b = 12.210(5), c = 12.976(5) , α = 108.220(8), β = 99.482(4), γ = 95.490(4)°, V = 1516.7(10) 3, Z = 2, Dc = 1.504 g/cm3, F(000) = 712, μ = 0.254, Mr = 686.64, the final R = 0.0561 and wR = 0.1487. One sulfonamido group of the title compound is deprotoned and forms N(3)=C(13). The crystal involves N,N-dimethylamine from the decomposition of DMF and the proton is transferred to N,N- dimethylamine. It is a strong proof for the characterization of deprotoned recognition compound by X-ray single-crystal structure.     

Synthesis of an Anionic Receptor Based on Phenylhydrazone Group and Its Recognition Property for Acetate

A colorimetric anion receptor was synthesized by a simple method where the phenylhydrazone moiety was need as binding sites. The anion recognition via hydrogen-bonding interactions can be easily monitored by anion complexation induced changes in UV-vis absorption spectra. Moreover, the hydrogen bond formation between the phenylhydrazone N-H and acetate or fluoride anion was described on the basis of ^1H NMR experiments.     

基于LaPO_4∶Ce,Tb-Au发光共振能量转移测定细胞色素C

以膦酰基羧酸共聚物为修饰剂,采用水热法制备了LaPO_4∶Ce,Tb发光纳米粒子,该粒子具有良好的水溶性和生物相容性。对合成的纳米粒子进行了发光光谱、X-射线衍射、透射电子显微镜和红外光谱表征。以制备的纳米粒子为能量供体,纳米金为能量受体,细胞色素C(Cyt C)为桥,构建了LaPO_4∶Ce,Tb-Au发光共振能量转移(LRET)体系,据此建立了测定Cyt C的新方法。实验结果表明,当Cyt C的浓度在0.333~21.0μg·mL~(-1)范围时,LRET体系发光猝灭程度与Cyt C浓度呈良好线性关系,检出限(S/N=3)为0.2μg·mL~(-1),相对标准偏差(RSD)为0.46%(c=10.0μg·mL~(-1),n=11)。该方法用于实际样品的测定,回收率范围为100%~101%。     

单分散SiO2/PS复合粒子的制备

聚合物包覆无机物的核一壳结构复合粒子研究长期以来受到关注,源于其应用广泛．根据表面性质要求对无机相或者有机相表面进行功能化,可使得到的复合粒子与不同的应用体系相匹配．这类聚合物包覆无机物的有机／无机复合粒子,已在光学器件、分离、药品、农业、涂料等很多领域有广泛和潜在应用．本文制备这类复合粒子用于石油工业模型催化剂和助剂．     

PO2X…PX3/PH2X(X=F,Cl, Br,CH3, NH2)复合物中π-hole磷键作用的电子密度拓扑分析

磷键作为一种新型的分子键合力,因在晶体工程和超分子合成等方面的重要作用而越来越多地引起科研工作者的广泛关注。本文采用量子化学从头算和电子密度拓扑分析等方法,在MP2/aug-cc-pVTZ理论水平上,对PO₂X…PX₃和PO₂X…PH₂X (X = F, Cl, Br, CH₃, NH₂) π型复合物的结构和磷键性质进行了理论研究。研究表明:π-hole磷键复合物存在A和B两种稳定构型,分别以P…P和P…X磷键作用为主。分子中原子(AIM)、非共价作用(NCI)、电子定域函数(ELF)及适应性自然密度划分(AdNDP)分析表明,不同取代基对该类磷键作用的性质产生很大影响:当取代基为给电子基(CH₃, NH₂)时,磷键具有明显的共价作用特征;当取代基为吸电子基(F, Cl, Br)时,构型和取代基不同的磷键分别表现为非共价、部分共价或共价作用特征。自然键轨道(NBO)分析指出,分子间磷键的Wiberg键级的数值越大,磷键的共价性越强,磷键的作用强度越大。构型B的电荷转移主要是PX₃/PH₂X中X原子上的孤对电子转移到PO₂X中π^*(P=O)反键空轨道。