[Na(18-C-6)]2[Cu(i-mnt)2]的合成与结构分析

研究了18-冠-6与Na2[Cu(i-mnt)2][i-mnt=异丁二腈烯二硫醇阴离子,S2CC(CN)2-2]的反应,得到的配合物[Na(18-C-6)]2[Cu(i-mnt)2](1)通过元素分析、红外光谱、X射线单晶衍射进行了结构分析.配合物为单斜晶系,空间群P2(1)/c.晶体学结构数据a=1.2819(11),b=1.1793(10),c=1.4928(13)nm,β=99.121(16)°,V=2.228(3)nm3,Z=2,Dcaled.=1.369g/cm3,F(000)=958,R1=0.0521,wR2=0.1003.1中的[Cu(i-mnt)2]基团通过配体i-mnt的氮原子与两个[Na(18-C-6)]基团中的钠原子成键,形成稳定的中性配合物.     

苯并18-冠-6配合物[K(B18-C-6)]SCN的合成与结构分析

苯并 18 -冠 - 6 (B18- C- 6 )与 K2 [Cd(SCN) 4 ]反应 ,得到了 [K(B18- C- 6 ) ]SCN配合物。通过元素分析、红外光谱、单晶 X射线衍射进行了结构分析。该配合物为单斜晶系 ,空间群 P2 (1) / c,晶体学数据 :a=0 .996 0(3) nm,b=2 .5 0 97(7) nm,c=0 .8374 (2 ) nm,β=10 6 .5 19(5 )°,V=2 .0 0 6 7(10 ) nm3 ,Z=4 ,F(0 0 0 ) =86 4,R1=0 .0 4 2 9,w R2 =0 .0 5 75。结构分析表明 ,该配合物由一个 [K(B18- C- 6 ) ]配阳离子和一个 SCN阴离子组成 ,配合物的两个分子通过 K+ - π相互作用形成一维链状结构     

高考题中的极限问题面面观

以2006年全国各地高考中对极限问题的考查为例,介绍四种常见类型供读者参考.……     

有消费或投资的华氏宏观经济模型

本文对华罗庚教授的宏观经济模型进行了推广 ,在原来模型的基础上 ,分别增加了消费、投资 ,得到两种不同的模型 ,并对模型具有经济意义的解进行了研究     

火焰原子吸收光谱法测定红车轴草及其提取物中铁和锰

应用火焰原子吸收光谱法(FAAS)测定了红车轴草及其提取物中铁和锰的含量,试验了仪器的工作条件并予以优化,经干燥和粉碎的试样于瓷坩埚中用浓硝酸处理,经蒸发至干,于马弗炉中在500℃灼烧1 h重复处理一次后用0.2 mol.L-1HCl浸取坩埚中残渣,所得溶液进行FAAS测定,两元素的线性范围为0.50~4.00 mg.L-1(铁)和0.20~3.00 mg.L-1(锰),相关系数依次为0.999 6和0.999 0。根据标准曲线斜率算得两元素的测定灵敏度依次为0.028和0.011 mg.L-1/1%。试验得铁的回收率为98.9%,锰的回收率为96.2%,平行5次测定一红车轴草试样中铁及锰量,对平均含铁量为67.0μg.g-1的相对标准偏差(RSD)值为2.45%,平均含锰量为7.8μg.g-1的RSD值为2.10%。     

一维链状冠醚配合物:[{Na(18-C-6)}2(H2O)]n[M(SCN)4]n(M=Pd、Pt)的合成与结构

The reactions of 18-crown-6 with Na₂[M(SCN)₄] (M= Pd,Pt) were studied and the complex 1 [{Na(18-C-6)}₂(H₂O)]_n[Pd(SCN)₄]_n and complex 2 [{Na(18-C-6)}₂(H₂O)]_n[Pt(SCN)₄]_n were characterized by ele-mental analysis, IR and X-ray diffraction analysis. The complexes belong to monoclinic, space group P2₁/n with cell dimensions, 1:a=1.05734(7),b=1.42250(10),c=1.47762(10) nm,β=107.5330(10)°,V=2.1192(2)nm³,Z=2,D_calcd=1.460g·cm^-3,F(000)=964,R₁=0.0406,wR₂=0.1264 and 2:a=1.05985(19),b=1.4237(3),c=1.4744(3) nm,β=107. 096(3)°, V=2.1264(7)nm³,Z=2,D_calcd=1.690g·cm^-3,F(000)=1028,R₁=0.0292,wR₂=0.0859. In the solid state, the complexes 1 and 2 show an one-dimensional chain of [{Na(18-C-6)}₂(H₂O)]²⁺ complex cations and [M(SCN)₄]^2- (M=Pd,Pt) complex anions bridged by Na-N in-teractions.     

One Novel Vanadium-Phosphate Cluster [PV_(2.5)O_(8.5)]-3.83{H_2O} with Three-Dimensional Architecture

A novel vanadium-phosphate compound [PV_2.5O_8.5]·3.83{H_2O}(1)was obtained from the hydrothermal reac-tion and structurally characterized by elemental analysis and single-crystal X-ray diffraction,which exhibited thatthe title complex crystallized in cubic space group I-43m with crystal data:a=1.6115(1)nm,V=4.1848(1)nm~3,Z=12,D_c=1.783 g/cm~3,F(000)=2278,R_1=0.0528,and wR_2=0.1329[I>2σ(I)](all data).The basic unit of{PV_2.5O_8.5}symmetrically extended to closed sphere-like structure of{P_4V_(10)O_(34)},which was further linked to in-terleaving three-dimensional network via sharing four phosphate through μ_3-oxygen atoms around the closedsphere-like structures.     

Pulse radiolysis of one-electron oxidation of rare tricyclic nucleoside derivative

~~Pulse radiolysis of one-electron oxidation of rare tricyclic nucleoside derivative@赵红卫$Shanghai Institute of Nuclear Research, Chinese Academy of Sciences! Shanghai 201800,China @江致勤$Department of Chemistry, Tongji Unviersity!Shanghai 200092,China @窦大营$Shanghai Institute of Nuclear Research, Chinese Academy of Sciences! Shanghai 201800,China @吴铁一$Shanghai Institute of Nuclear Research, Chinese Academy of Sciences! Shanghai 201800,China @王文锋$Shanghai…     

Synthesis and Crystal Structure of a Novel Zinc Complex [Zn(OH_2)(HDPA)_2]·3H_2O

1INTRODUCTION In recent years,dicarboxylic acids have been wide-ly used as poly-dentate ligands involved in various metal chelation reactions to form transition or rare earth metal complexes with interesting properties in material science[1~3]and biological systems[4~7].For example,Kim,Y.and his coworkers focus on the syn-theses of copper(II)complexes containing ligands of malonate and pyrazine to study their electronic con-ductivity and magnetic property[8].The importance of Tr(II)/dic…     

二维网状结构双核配合物[Ca_2(C_(10)H_8N_2O_4)_2(DMSO)_2(H_2O)_4]·2DMSO的合成、热分解及晶体结构

以2-羰基丙酸水杨酰腙(C_(10)H_(10)N_2O_4)作为配体与碳酸钙在水中反应， 在DMF(N,N'-二甲基甲酰胺)和DMSO（二甲基亚砚）的混合溶剂中培养了单晶，其组 成为 [Ca_2(C_(10)H_8N_2O_4)_2(DMSO)_2(H_2O)_4]·2DMSO [C_(10)H_8N_2O~2- _4为2-羰基丙酸水杨酰腙负离子]。测字了单晶的结构，该单晶为黄色，属单斜晶 系，空间群为P2(1)/C，晶胞参数a=1.0634(3)nm, b=1.7035(5)nm, c=1.2183(3) nm, β=106.180(5)°, V=2.1192(10)nm!, Dc=1.412Mg·m~(-3), Z=2, F(000) =944, μ=0.534m~(-1)，GOF=0.867。所测单晶是以2-卷曲在丙酸水杨酰腙羧基上 的一个氧原子作为桥联的双核钙（II）配合物，两个Ca~(2+)均处于五角双锥的七 配位环境中，锥底为配体2-羰基丙酸水杨酰腙中的三个配位原子，以及另一2-羰基 丙酸水杨酰腙羧基上的桥联氧原子和一个水分子的配位氧原子，锥顶为一配位水和 一想位的DMSO分子，即溶剂DMSO也参也了配位，从晶胞结构看，晶体中除配位的 DMSO分子外，还有自由的DMSO溶剂分子，它们与配位水以氢键连接存在于晶格之中 ，在空间形成的二维网状结构。通过TG-DTG还测定了配合物的热稳定性。