Mathieu groups and its degree prime-power graphs

Let cd(G) be the set of irreducible complex character degrees of a finite group G. The degree graph of G related to cd(G) was defined. It was proved many finite simple groups (but not all Mathieu groups) are uniquely determined by their orders and degree graphs. We hope to define a new graph related to cd(G) such that more simple groups can be uniquely determined by their orders and this newly defined graphs. Here a degree prime-power graph is defined and it is proved that all Mathieu groups can be determined uniquely by their orders and degree prime-power graphs.     

岭回归法同时测定五组分的研究

岭回归分光光度法（ＬＨＧ）是近年来发展起来的计算分光光度法之一,本文将该法应用于五组分体系——对乙酰氨基酚、对氨基酚、对硝基酚、对乙酰氨基酚乙酸酯、对硝基酚乙酸酯的分析研究,文中详细介绍了介质的选取,混合标准溶液组数的确定。实验结果表明,在０．１ｍｏｌ·Ｌ－１盐酸介质中,该法对样品中各组分的平均回收率在９５．５％～１０６．１％之间,相对标准偏差在０．８％～９．８％之间。本法具有操作简便又能与计算机联机等特点,已用于合成扑热息痛过程中样品的测定,结果满意。     

岭回归分光光度法测定三组分样品的研究

用无水乙醇作溶剂,本文将岭回归分光光度法应用于对乙酰氨基酚,对硝基酚,对氨基酚三组分含量的分析。详细介绍了该方法的基本原理和分析步骤,实验结果表明：在无水乙醇介质中,该法对样品中各种组分的平均回收率为９９．２４％￣１０１．３１％,与现行分析方法比较,本方法具有简便、快速、适宜于计算机分析等特点。     

三维有序二氧化锰大孔材料的模板技术合成及表征

Using close-packed colloidal crystals-silica as the template,a novel 3D well-ordered and long-ranged periodic macroporous material MnO2 has been prepared by colloidal crystals template methods. The prepared product has been characterized by means of X-ray diffraction（XRD）and scanning electron micrography（SEM）. The X-ray diffraction displays that the phase of MnO2 is tetragonal,and the scanning electron micrography shows that MnO2 replicates the structure of the started template and exhibits 3D long-range ordered honeycomb framework. The process of preparing the 3D order macroporous MnO2 was discussed. The effect of the infiltration times to the final morphology of MnO2 was studied and an abnormity existed in the shrinkage of the final outcome.     

Synthesis and structure of cuboctahedral and anticuboctahedral cages containing 12 quadruply bonded dimolybdenum units

The syntheses and structures of two clusters containing 12 Mo-Mo quadruple bonds, [Mo(24)(C(12)H(12)O(4))(24)](C(5)H(5)N)(12) and Mo(24)(C(8)H(4)O(4))(24), are reported. The 12 paddlewheel building blocks and 24 ligands self-assemble into cuboctahedral and anticuboctahedral polyhedra, respectively, depending on the manner in which the two halves of the cluster are aligned. These clusters contain twice as many dimolybdenum units as any previously reported cluster. Possible assembly mechanisms are also proposed.     

Synthesis and structure of a three-dimensional coordination polymer [Ag<Subscript>3</Subscript>hmt<Subscript>3</Subscript>(μ<Subscript>3</Subscript>-btc)]·5H<Subscript>2</Subscript>O

A new coordination polymer [Ag₃hmt₃(₃-btc)]·5H₂O (1 )(hmt = hexamethylenetetramine, btc = 1,3,5-benzenetricarboxyl)has been successfully synthesized. Crystal data: P2₁/a , a = 11.9906(2) Å, b = 17.3689(2) Å, c = 16.96100(10) Å, = 101.9820(14)°, V = 3455.40(7) ų, Z = 4, Dc = 2.002 mg/m³. In the hexagonal structure of the Ag-hmt unit, each Ag-hmt unit comprises three Ag atoms and three hmt ligands. The ₃-btc ligands bridge the adjacent two-dimensional honeycomb-like Ag-hmt layers to form three-dimensional networks. Structural analysis shows that hydrogen bonds play a key role for the structural stability of the compounds.Original Russian Text Copyright © 2004 by Shoubo Qin, Sheming Lu, Yanxiong Ke, Jianmin Li, Shuxi Zhou, Xintao Wu, and Wenxin DuTranslated from Zhurnal Strukturnoi Khimii, Vol. 45, No. 3, pp. 566–571, May–June 2004.     

2-乙烯基硝基苯-8-羟基喹啉锌配合物的合成及紫外、荧光性质研究

设计合成了3种8-羟基喹啉衍生物配体:(E)-2-[2-(2-硝基苯基)乙烯基]-8-羟基喹啉(4a),(E)-2-[2-(3-硝基苯基)乙烯基]-8-羟基喹啉(4b),(E)-2-[2-(4-硝基苯基)乙烯基]-8-羟基喹啉(4c)及其相应的锌配合物5a～5c,产物经1H NMR,IR,MS和元素分析技术进行了结构表征.通过紫外滴定模拟了金属锌与配体的配位过程,分别测定了它们固态和溶液状态下的荧光性质:光谱显示化合物5a～5c固体荧光光谱的λmax分别是596,625,592 nm,在DMF溶液中的λmax分别是562,536,618 nm.荧光光谱显示硝基位置的改变可以调控8-羟基喹啉锌配合物的发光性质.     

Preparation of a stationary phase with s‐triazine ring embedded group for reversed phase high‐performance LC

This paper describes the synthesis and chromatographic evaluation of a new polar‐embedded stationary phase, which utilized 2,4,6‐trichloro‐1,3,5‐triazine as the spacer. The resulting materials were characterized by elemental analysis, IR, and solid‐state ¹³C NMR. Empirical test mixtures were utilized to evaluate the column, and showed that it had good performance for basic compounds and high selectivity for polyaromatic hydrocarbons. Moreover, the novel stationary phase has unique property, especially in the separation of “homologous alkaloids” from natural products.