Synthesis of 1-substituted 2,6,7-trioxa-4-phospha-1-borabicyclo[2.2.2]octan-1-uide

1-Substituted 2,6,7-trioxa-4-phospha-1-borabicyclo[2.2.2]octan-1-uides were obtained in 31–71% yields by the reaction of tetrakis(hydroxymethyl)phosphonium sulfate with alkyl- or arylboronic acids in the presence of tetrabutylammonium hydroxide.     

Synthesis,Structure and Magnetic Properties of Two Cobalt(II) Dicyanamide (dca) Complexes with Heterocyclic Nitrogen Donors Tetra(2‐pyridyl)pyrazine (tppz) and 2,4,6‐Tri(2‐pyridyl)‐1,3,5‐triazine (tptz): [Co2(tppz)(dca)4]·CH3CN and [Co(tptz)(dca)(H2O)](dca)

Two new transition metal dicyanamide complexes [Co₂(tppz)(dca)₄]·CH₃CN ( 1 ) [tppz=tetra(2‐pyridyl)pyrazine, dca=dicyanamide] and [Co(tptz)(dca)(H₂O)](dca) ( 2 ) [tptz=2,4,6‐tri(2‐pyridyl)‐1,3,5‐triazine] were synthesized and characterized by single crystal X‐ray diffraction analysis. In 1 each cobalt(II) atom is coordinated to three dca anions and one tppz molecule to form a distorted octahedral geometry, the neigbour two cobalt(II) atoms are bridged by one tppz ligand to form a dimer, then the cobalt(II) atoms in each dimer are joined together to form a ladder chain structure. In 2 the coordination geometry around the central metal is also distorted octahedral, each cobalt(II) atom is coordinated by two dca anions, one tptz molecule and one water ligand to form a cationic part, and the cationic part is linked with the free dca anions via the electrostatic attraction to give an infinite chain structure. Magnetic susceptibility measurement in the range of 2–300 K indicates that there are antiferromagnetic couplings between adjacent metal ions in 1 (T>29 K, (=?9.78 K, C=4.92 cm³·K·mol^?1) and ferromagnetic couplings in 2 (T>150 K, (=7.97 K, C=2.59 cm³·K·mol^?1) respectively.     

Embryotoxicity studies of tri‐n‐butyltin(IV) complexes of 5‐[(E)‐2‐(aryl)‐1‐diazenyl]‐2‐hydroxybenzoic acid and 2‐[(E)‐2‐(3‐formyl‐4‐hydroxyphenyl)‐1‐diazenyl] benzoic acid on sea urchin development

The toxicity studies of free 5‐[(E)‐2‐(aryl)‐1‐diazenyl]‐2‐hydroxybenzoic acid and 2‐[(E)‐2‐(3‐formyl‐4‐hydroxyphenyl)‐1‐diazenyl]benzoic acid and their tri‐n‐butyltin(IV) complexes were evaluated by using sea urchin early developmental stages as recommended model organisms for toxicity tests. The novel complexes, as the parent tri‐n‐butyltin(IV) chloride (TBTCl), caused mitosis block and induced high embryonic mortality in sea urchin. Copyright © 2005 John Wiley & Sons, Ltd.     

含⊥酰亚胺和8-羟基喹啉双官能团的金属络合物型发光材料

应用 Gabriel反应替代传统的亚酰胺缩合法 ,成功地合成了一种含⊥酰亚胺发色团的金属络合物型发红光材料 (Pery- q) 3 Al,在其结构中引入电子传输功能单元 8-羟基喹啉铝 (Alq3 )。在 (Pery- q) 3 Al体系中 ,由于单线态之间的能量转移 ,导致 Alq3 单元的荧光发生了严重的淬灭     

微波固相合成三(邻氯苄基)锡肉桂酸酯及其结构与量子化学研究

三(邻氯苄基)氯化锡与肉桂酸按物质的量比1∶1,通过微波固相反应合成了三(邻氯苄基)锡肉桂酸酯。经X-射线衍射方法测定了其晶体结构,化合物属三斜晶系,空间群为P1,晶体学参数a=0.974 91(3)nm,b=1.096 57(3)nm,c=1.485 91(4)nm,α=104.115 0(10)°,β=90.241 0(10)°,γ=111.715 0(10)°,V=1.423 35(7)nm3,Z=2,Dc=1.499 g.cm-3,μ(Mo Kα)=12.04 cm-1,F(000)=644,R1=0.024 9,wR2=0.083 6。中心锡与亚甲基碳和羧基氧原子构成畸型四面体。对其结构进行量子化学从头计算,探讨了配合物的稳定性、分子轨道能量以及一些前沿分子轨道的组成特征。     

两个有机锡杂环羧酸酯配合物的合成、结构及抗癌活性

合成了2个有机锡杂环羧酸酯配合物：二（邻溴苄基）锡二（2-吡啶甲酸）酯（1）和三（2-甲基-2-苯基丙基）锡3-吲哚丁酸酯（2）。通过元素分析、红外光谱、核磁共振谱（¹H、¹³C和¹¹⁹Sn）、X射线衍射、热重分析进行了表征,用X射线单晶衍射方法测定了配合物的晶体结构,进行了配合物的结构量子化学从头计算和体外抗癌活性研究。结果显示：配合物均为单锡核分子,锡原子分别为六配位的畸变八面体构型和四配位的畸变四面体构型;配合物对人肝癌细胞（HUH7）、人肺癌细胞（A549）、人表皮癌细胞（A431）、人结肠癌细胞（HCT-116）和乳腺癌细胞（MDA-MB-231）的抑制活性均比临床使用的顺铂强。     

Halogen - metal exchange of 3-substituted 1,2-dibromoarenes: the use of long-range JCH coupling constants to determine regiochemistry

Regioselective halogen/metal exchange reactions were carried out on a series of 3-substituted- 1,2-dibromoarenes. Product mixtures were quenched with CO2 to form the corresponding benzoic acid analogs to facilitate HPLC and NMR analysis. Substitution at the 3-position could readily be assigned on the basis of 2D HMBC long-range correlations, while assignment at the 2-position was not as straightforward. The use of three-bond J(CH) coupling constant measurements, extracted from 1-D 1H coupled 13C experiments, were necessary to render unequivocal regio assignments.     

干涉项对e~+e~-→q+ng两种色连接几率的影响

传统高能e+ e-→hadrons事例产生器普遍采用大Nc 近似 ,使色单态链产生几率达到 10 0 %而色分离态几率为 0 .本文在Nc=3的真实情况下 ,研究了干涉项中颜色部分和动量部分的来源及性质后发现 ,对e+ e-→qq +ng部分子末态中胶子数 2 ,3,干涉项使色单态链产生几率进一步下降到 6 7% ,5 8% ,而n =2时的色分离态几率则增大至不考虑干涉项的 2倍 .由上推断当胶子数n更大时色单态链几率将远小于 1,色分离态几率将更显著增加     

掺杂各向异性三角晶格系统的自旋动力学

在t_J模型和fermion_spin理论框架下，研究了欠掺杂区 各向异性三角晶格反铁磁体的自旋动力学.与掺杂的四方晶格反铁磁体一样，随着掺杂的增大出现了公度到非公度的转变，而且散射峰的位置与各向异性度有关.尽管非公度峰的位置不随能量变化，但其权重随能量的增大而降低.  关键词： t_J模型 fermion_spin理论 三角晶格