稀土铈掺杂对甲烷高温燃烧催化剂LaFeAl11O19结构和性能的影响

六铝酸盐甲烷高温燃烧催化剂研究目前主要集中在BaMnA l11O19基和LaMnA l11O19基的催化剂上[1-4],关于LaFeA l11O19催化剂研究相对较少,而据文献报道[5]在沉淀法制备取代型的六铝酸钡催化剂中铁和锰活性相近,但铁比锰具有更高的耐高温和抗水热冲击的能力,因此本工作选择LaFeA l     

烯烃配位的过渡金属卡宾配合物的研究——ⅩⅥ.四氟苯并双环[2.2.2]辛三烯三羰基铁的新奇开环反应——新型螯合双烯丙基二羰基铁配合物的合成和结构

四氟苯并双环[2.2.2]辛三烯三羰基铁(C_(12)H_6F_4)-Fe(CO)_3(1)与芳基锂试剂ArLi(Ar=C_6H_5ο-,m-,ρ-CH_3C_6H_4、ρ-CH_3OC_6H_4、ρ-ClC_6H_4),在低温下反应,生成的酰羰基锂盐中间体用三乙基氧铃一四氟硼酸盐(Et_3OBF_4)在水溶液中于O℃进行烷基化时,双环烯烃配体开环,生成组成为(C_(12)H_6F_4)(CO)_2FeC(OC_2H_5)Ar的螯合双烯丙基二羰基铁配合物(2—7)。配合物5的晶体属单斜晶系,晶胞参数为:a=16.870(4),b=13.707(4),c=19.361(4)A,β=107.92(2)°,v=4259(1)A~3,z=8,空间群为C_(2h)~6—C2/c,最后的偏离因子R=O.0409,R_w=O.0391。     

NaY超笼内[Pt3(CO)3(μ-CO)3]^2-n(n=3,4)簇合物的合成,表征及其催化CO+NO的反应性能

在ＮａＹ分子筛超笼内合成了桔黄色的［Ｐｔ９（ＣＯ）１６］＾２－和深绿色的［Ｐｔ１２（ＣＯ）２４］＾２－簇合物。前者给出２０５６和１７９８ｃｍ＾－１的线式和桥式羰基特征红外谱带；后者给出２０８０和１８２４ｃｍ＾－１谱带。与在ＴＨＦ溶液中结果相比，ＮａＹ内合成的羰基簇合物的线式ｖｃｏ向高波数位移，而桥式ｖｃｏ向低波数位移。ＥＸＡＦＳ为Ｐｔ羰基簇合物在分子筛内的规整形成提供了证据。ＮａＹ内Ｐｔ９和Ｐｔ１     

THE CRYSTAL STRUCTURE OF THE ADDITION COMPOUND OF SODIUM TETRAHYDROGEN DECAVANADATE AND HEXAMETHYLENETETRAMINE

The title compound crystallizes in the space group C_i~1-Pī with cell constants a=9.589, b=10.486, c=11.139, α=103.27° β=98.20° and γ=103.16°. After deriving the position parameters of all V atoms by Patterson method, the coordiuates of all the non-hydrogen and hydrogen atoms were obtained from successive Fourier and difference syntheses, and the leastsquares refinement for all atoms gave a final discrepancy factor R=0.0279. The chemical content within a unit cell has been identified definitely as (Na~+)_2·(H_2V_(10)O_(28)~(4-))·2((CH_2)_6N_3N-H~+)·8H_2O.     

含烯烃配体的过渡金属卡宾配合物的研究 Ⅴ.新型异构化的环己二烯(二羰基)[乙氧基(芳基)卡宾]铁配合物的合成和结构

最近,我们报道了含直链共轭双烯配体和支链共轭双烯配体的金属羰基化合物,丁二烯三羰基铁和异戊二烯三羰基铁与亲核试剂芳基锂在低温下反应,继后用Et_3OBF_4烷基化,分别生成一族新奇的异构化的丁二烯和异戊二烯烷氧基卡宾铁配合物。这些配合物的结构显示的中心金属和烯烃配体的键合方式是非常有趣的。本文选择含环状共轭双烯配体的1,3-环己二烯三羰基铁(1)与芳基锂在低温下进行类似的反应,以观察环烯烃配体的反应活性及其     

2-(2′-噻唑偶氮)-5-二乙胺基酚的晶体结构

用 Philips PW-1100型单晶衍射仪收集了2-(2′-噻唑偶氮)-5-二乙胺基酚晶体的三维衍射数据.应用最小函数法和直接法测定了晶体结构.在衍射仪上测得晶胞常数 a=20. 018(±0. 005),b=8. 894(±0. 03) (?),c=7. 658(±0. 002) ,z=4. 空间群为P2_12_12_1. 原子的坐标参数、温度因子参数及非氢原子的各向异性温度因子参数一起进行了全矩阵最小二乘修正,最后 R 因子为0. 072,加权以后 R_W 为0. 051. 晶体结构分析结果表明:二乙胺基有效地参与了共轭体系,使二乙胺基的强助色性能得到了很好的解释.     

THE STUDY OF SPECTRA AND X-RAY CRYSTAL STRUCTURE OF A NOVEL BIONICS INSECTICIDE——(CH_3)_2NHCH(CH_2S_2O_3)_2Na·H_2O

IR and NMR spectra of novel bionics insecticide—C_5NS_4O_6H_(12)Na·H_2O have been studied. The molecular and crystal structures of the compound also have been determined. The compound crystallizes in the monoclinic space group C_(2h)~5, - P2_1/n with α= 8.0972. (9) , b =16.262(4), c = 10.370(3), β= 94.26(2)° and z = 4.The result shows that N atom in this compound captures a proton to form HN~ group, Na~ is in statistical disorder. Therefore, the structural formula of tho compound is (CH_3)_2HN~ —CH(CH_2S_2O_3~-)_2·1/2 (Na~ )_2·H_2O.     

溴酸钾-酸性铬蓝K新化学发光体系检测水中亚硝酸根

研究发现亚硝酸根对溴酸钾-酸性铬蓝K体系的化学发光有显著的增强作用,从而建立一种快速、准确的检测亚硝酸盐的新方法.本方法检测亚硝酸根的线性范围为1.0×10-8～8.0×10-5mol/L,检测限为1.1×10-10mol/L;对1.0×10-7mol/L和1.0×10-5mol/L的亚硝酸根进行11次平行测定,标准偏差分别为1.6%和2.1%.     

Organogels Derived from Potassium 8-Nitroquinolinecarboxylate

A new class of organogels derived from potassium 8-nitroquinolinecarboxylate was selectively formed in THF/MeOH （V：V=1： 1）, and their superstructures were characterized by atomic force microscopy, scanning electron microscopy and transmission electron microscopy.