首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   10篇
  免费   2篇
  国内免费   2篇
化学   14篇
  2013年   1篇
  2011年   1篇
  2010年   2篇
  2009年   4篇
  2007年   1篇
  2006年   1篇
  2003年   1篇
  1998年   2篇
  1995年   1篇
排序方式: 共有14条查询结果,搜索用时 27 毫秒
1.
The structure of a manganese(Ⅱ) polymer,[Mn(TP)(TBZH)]2n 1(TBZH=thiabendazole,TP=terephthalic acid),has been determined by X-ray crystallography and characterized by elemental analysis,IR spectrum and thermogravimetric analysis.It crystallizes in the orthorhombic system,space group Pbcn with a=12.7813(12),b=10.7544(10),c=20.1270(19) ,V=2766.6(4)3,Z=8,C14H9Mn0.50N3O2S,Mr=310.77,Dc=1.492g/cm3,F(000)=1268,μ=0.674 mm-1 and S=1.064.The 1-D chain architecture of 1 is constructed from terephthalic acid and manganese atoms.Hydrogen bonds and aryl ring π-π stacking interactions in 1 contribute to form a 3-D supramo-lecular structure.  相似文献   
2.
A new metal-organic complex [Mn2(PDC)2(bipy)2(H2O)2] (H2PDC = 2,4-pyridine-dicarboxylic acid, bipy = 2,2′-bipyridine) 1 has been hydrothermally synthesized and structurally characterized by elemental analysis, IR spectrum, TG and single-crystal X-ray diffraction. The compound crystallizes in triclinic, space group P ^-1 with a = 7.376(3), b = 9.990(4), c = 11.950(5) A^°, α= 75.217(5), β = 78.052(5), γ = 70.655(5)°, V = 796.0(5)A^°3, C34HE6Mn2N6O10, Mr = 788.49, De = 1.645 g/cm^3,μ(MoKa) = 0.866 mm^-1, F(000) = 235, Z = 1, the final R = 0.0425 and wR = 0.0700 for 1971 observed reflections (I 〉 2σ(I)). In the crystal structure, the manganese atom is six-coordinated by two carboxylate oxygen atoms from two different PDC ligands, one aqua ligand, and three nitrogen atoms from 2,2′-bipy and PDC ligands, giving a distorted octahedral geometry. It exhibits a three-dimensional supramolecular network defined by O-H…O hydrogen-bonding interactions.  相似文献   
3.
提出了在聚乙烯醇存在下,Fe(Ⅲ)-磺基水杨酸-甲基紫三元配合物光度法测定Fe(Ⅲ)的方法.该法灵敏度高(ε=3.44×105L@mol-1@cm-1),选择性及精密度均好,用于水中痕量铁的测定,结果满意.  相似文献   
4.
A metal-organic coordination polymer [Zn(Pht)(Medpq)]n (Pht=phthalic acid, Medpq=2-methyldipyrido[3,2-f:2′,3′-h]quinoxaline) (1) has been hydrothermally synthesized and structurally characterized by elemental analysis, IR spectrum, TG and X-ray single-crystal structure analysis. Title complex crystallizes in the monoclinic system, space group Cc, with a=1.027 4(4) nm, b=2.955 7(11) nm, c=0.685 2(3) nm, β=112.941°, V=1.916 3(13) nm3, C23H14N4O4Zn, Mr=475.75, Dc=1.649 g·cm-3, μ(Mo Kα)=1.324 mm-1, F(000)=968, Z=4, the final R=0.038 8 and wR=0.071 7 for 2 697 observed reflections (I>2σ(I)). In the crystal structure, the Zinc atom is six-coordinated with four carboxylate oxygen atoms from two different carboxylate groups and two nitrogen atoms from Medpq ligand, showing a slightly distorted octahedral geometry. Furthermore, it exhibits a one-dimensional structure with Pht-Zn-Medpq as building units. CCDC: 716600.  相似文献   
5.
薄层树脂相吸光光度法测定水中铁的研究   总被引:18,自引:0,他引:18  
本文提出了薄层树脂相吸光光度法,并以Fe(Ⅱ)-Phen体系为例进行了应用,实测了几种天然水中铁含量,灵敏度高(ε=1.12×106L·mol-1·cm-1)。稳定性好,精密度理想(测定5μgFe10次,RSD%=3.2%)。  相似文献   
6.
催化动力学光度法测定痕量钒(Ⅴ)的研究   总被引:1,自引:0,他引:1  
研究了在pH9.2的硼砂介质中,痕量钒(Ⅴ)催化H2O2氧化桑色素褪色反应体系的新催化光度法。测量范围为0~7.5μg/50mL加标回收率为95%~98.5%,测定2μg钒(Ⅴ),RSD为1.68%,用于水样中痕量钒(Ⅴ)的测定。  相似文献   
7.
由5-(3-吡啶基)间苯二甲酸(H2pyip)为配体合成了一个Cd配位聚合物[Cd(pyip)(H2O)2]n(1)(H2pyip=5-(3-吡啶基)间苯二甲酸),并对其进行了元素分析、IR,热分析以及X射线单晶衍射法表征。晶体结构表明:配合物1属于六方晶系,P61空间群,配合物1中心镉原子是略微变形的八面体构型,该化合物通过5-(3-吡啶基)间苯二甲酸连接成了三维网格结构。配合物1的荧光测试表明它具有绿色荧光。  相似文献   
8.
黄艳菊  崔运成  杜刚 《无机化学学报》2009,25(10):1882-1884
A metal-organic Complex [Cu2(ipt)(Medpq)2]n (ipt=isophthalic acid, Medpq=2-methyldipyrido[3,2-f:2′,3′-h]quinoxaline) 1 has been hydrothermally synthesized and structurally characterized by elemental analysis, IR spectrum, TG and single-crystal X-ray diffraction. Title compound crystallizes in the monoclinic system, space group C2/c, with a=2.389 2(6) nm, b=0.709 60(18) nm, c=1.922 2(5) nm, β=108.655(3), V=3.087 8(14) nm3, C38H24Cu2N8O4, Mr=783.73, Dc=1.686 g·cm-3, Z=4, the final R=0.055 4 and wR=0.128 5. In the crystal structure, the copper atom is three-coordinated with one carboxylate oxygen atom from carboxylate groups and two nitrogen atoms from Medpq ligand, showing a slightly distorted triangle geometry. Furthermore, it exhibits a zero-dimensional structure with ipt-Cu- medpq as building units. CCDC: 747544.  相似文献   
9.
催化动力学光度法测定痕量钒(V)的研究   总被引:8,自引:2,他引:6  
研究了在pH9.2的硼矽介质中,痕量钒(V)催化H2O2氧化桑色素褪色反应体系的新催化光度法,测定范围为0~7.5μg/50mL,加标回收率为95%~98.5%,测定2μg钒(V)RSD为1.68%,用于水样中痕量钒(V)的测定。  相似文献   
10.
离子液体[Bmim]PF6萃取-火焰原子吸收法测定水中痕量镉   总被引:1,自引:0,他引:1  
王良  李清  闫永胜  崔运成 《分析化学》2011,(11):1776-1777
1引言化学工业排放的废水含有大量金属镉,对环境产生严重危害,因而环境水样中痕量镉的准确测定具有重要意义。目前,常用原子吸收光谱法[1]测定痕量的镉,但由于环境水样中镉的含量低且样品复杂,为了提高分析方法的灵敏度和选择性,样品的预分离与富集至关重要。液-液萃取是一种常用的预分离与富集方法,但常用有机溶剂作萃取剂,易带来二  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号