多碘阴离子与双核配合物阳离子的超分子组装

通过多碘阴离子与双核配合物阳离子的超分子组装获得了3个新的化合物并对其进行了X射线结构测定和红外光谱,紫外-可见光谱的表征。它们是[(NiCl(bpy)~2)~2^2^+](I~3^-)~2(I~2)(1),[(MnCl(bpy)~2)~2^2^+](I~3^-)~2(I~2)(2)和[(MnCl(bpy)~2)~2^2^+](I~7^-)~1~/~2(I~5^-)(I~3^-)~1~/~2(I~2)~1~/~2(bpy=2,2'-bipyridine)(3)。晶体学数据：1单斜晶系,空间群C2/c,a=1.37091(3)nm,b=1.67996(3)nm,c=2.20708(5)nm,β=91.6114(12)°,V=5.08106(18)nm^3,Z=4,对4367个可观测反射点R1=0.0674;2单斜晶系,空间群C2/c,a=1.38898(3)nm,b=1.70579(4)nm,c=2.22092(4)nm,β=92.9168(13)°,V=5.25523(19),Z=4,对4485个可观测反射点R1=0.0470;3三斜晶系,空间群P-1,a=1.10793(4)nm,b=1.43488(5)nm,c=1.98724(8)nm,α=100.6352(16)°,β=96.4348(19)°,γ=110.0297(19)°,V=2.86409(18)nm^3,Z=2,对7156个可观测反射点R1=0.0634。这三个化合物中都含有具有分叉形状的双核配合物阳离子[(MCl(bpy)~2)~2]^2^+(M=Mn,Ni),它们通过配体bpy之间的π-π堆垛构成带孔洞的层状结构,在层中由配体bpy围成的孔洞填充了I~2分子或I~3^-阴离子,组装成由I~2分子或I~3^-阴离子穿越的正电性的层。在层和层之间则占据了相互连接的I~2,I~3^-,I~5^-,I~7^-,并与层中的I~2,I~3^-相连,形成复杂的具有无限扩展结构的多碘离子的网络,在网络中,多碘离子构成了直径达纳米的孔道结构。对化合物的红外光谱(4000～50cm^-^1)进行了归属。化合物1和3的紫外-可见漫反射光谱(200～800nm)为无特征的宽吸收带,源于无限扩展结构的多碘离子上的电子离域。     

壳核结构增韧剂对热塑性共聚酯／聚乙烯辛烯弹性体共混体系增容与增 …

研究了马来酸酐接枝的聚乙烯辛烯弹性体／半结晶性塑料共混物（ＴＰＥｇ）对热塑性共聚聚酯（ＰＥＴＧ）／聚乙烯辛烯弹性体（ＴＰＥ）共混体系增容增韧作用的影响。马来酸酐接枝物显著地改善了ＰＥＴＧ与ＴＰＥ之间的相容性,导致ＴＰＥ分散相颗粒细化,并促使分散相颗粒面间距等于甚至小于实现脆韧转变所需的临界面间距。在固定ＰＥＴＧ基体含量为８５ｗｔ％的前提下,当ＴＰＥｇ在１５％分散相中的含量由２０％增加到３０％时,即     

Synthesis, characterization and magnetism of binuclear cobalt (II) complexes bridged by tetracarboxylato groups

Three new binudear cobalt (II) complexes with extended te-tracarboxylato- bridge have been synthesized and characterized, namely [Co2 (PMTA) (bpy)4] (1), [Co2(PMTA)-(phen)4] (2) and [Co2(PMTA) (NO2phen)4] (3), where PMTA represents the tetraanion of pyroniellitic acid, and bpy, phen, NO2-phen denote 2,2'-bipyridine, 1,10-phenan-throline; 5-nirto-1, 10-plienanthroline, respectively. Based on elemental analyses, molar conductivity measurements, IR and electronic spectra studies, it is proposed that these complexes have PMTA-bridged structures and consist of two cobalt (II) ions, each in a distorted octahedral environment. These complexes were further characterized by variable temperature magnetic susceptibility measurements (4-300 K) and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, giving the exchange integral J = - 1.02 cm-1 for 1, J = -1.21 cm-1 for 2 and J = - 1.18 cm-1 for 3, respectively. These results revealed the operation of antiferromagneti     

Mechanistic Study of Partial Oxidation of Methane to Syngas over c Pd/SiO2 Catalyst

Partial oxidation of methane (POM) to make syngas has been largely studied in recent years because of its potential to reduce the cost of syngas. Two reaction schemes have been proposed for the reaction:one is the sequence of combustion of CH₄ followed by reforming of unconverted CH₄ with CO₂ and H₂O,and the other is the direct partial oxidation of CH₄ to CO and H₂ without the experience of CO₂ and H₂O as reaction intermediates. In the industrial process, if the combustion-reforming mechanism predominantly contributes to the conversion of methane to syngas, severe heat management problems have to be taken into account. Therefore, the elucidation of the reaction pathway is of vital importance. In this paper, in situ time-resolved FTIR (in situ TR-FTIR) spectroscopy was used to study the POM reaction over lwt%Pd/SiO₂. The results of catalytic performance evaluation on the POM reaction over lwt%Pd/SiO₂ under different space velocity are also presented. It is expected that the additional proof can be presented to interpret POM mechanism.     

In-situ FT-IR spectra of surface Adspecies of Nitrogen or Hydrogen on Ru/MWNTs

The IR studies on Ru surfaces have revealed important information such as disposition of nitogen^[1-3] and adsorption site of H^[3-4]. Most of Ru-based catalysts, however, were supported on oxides. In our experiments, Ru was supported on carbon nanotubes and this catalyst has high activity for ammonia synthesis. The experiment was carried out on Nicolet 740 FTIR. The catalyst surface was detected during the processed of temperature-programmed adsorption of N₂ and H₂) respectively, from 298 K to 773 K. The FTIR spectra of adsorbed H₂ and N₂ are shown on Fig.l. At 298 K two peaks assigned to adsorbed hydrogen atoms were observed at 2124 and 1564 cm^-1. At 673 K, these two peaks shift to 2089 and 1475 cm^-1, respectively, and another peak appeared at 1775 cm^-1. The peaks at 2124 and 2089 cm^-1 can be assigned to the model of H right on top of Ru, and 1564 and 1475 cm^-1 may be due to the bridging H. The peak at 1775 cm^-1, which can only be observed at high temperature, may be twin-type H. Nitrogen molecularly adsorbed was observed at 1893 cm^-1 (298 K) and 1856 cm^-1 (673 K) and they can be assigned to liner N₂ on top site.     

Synthesis of Diethylaminoethyl Carboxylic Esters

Dialkylaminoethyl carboxylic esters (1-5) with two biologically active moieties, carboxylic acid and dialkylaminoethanol were previously reported to show some biological activity in the presence of the coordinated effect of the two parts.     

模糊仿真理论综述及探讨

从复杂系统中普遍存在的模糊不确定性出发,指出了传统仿真技术（包括定量仿真和定性仿真）所存在的不足,提出了进行模糊仿真理论方法研究的必要性,在参考国内外大量文献的基础上,加上读者的研究,总结了目前模糊仿真的研究现状。     

超短光脉冲技术的研究进展

超短光脉冲在遥测、探索微观世界的规律以及产生高温等离子体等方面有极广泛的用途。介绍了超短光脉中产生的工作原理及国内外发展状态,并介绍了几种获得超短光脉冲的方法。     

时域MEI方法初探

对时域ＭＥＩ方法进行了初步探索,根据ＭＥＩ方法的基本原理,建立起时域ＭＥＩ方法的一阶吸收边界条件,应用该条件对线源辐射问题的数值实验和研究表明,它可使截断边界离源更近,同时也证实了时域ＭＥＩ方法的可靠性和精确性。     

LPP聚酰亚胺取向膜的制备及其取向研究

合成具有光敏性的聚酰亚胺OPDA－BAPAF－Cin－CN,对其化学性质进行研究。用这种聚酰亚胺作为光致取向剂,能对液晶MLC－LC2000有良好的取向效果。研究了这种取向剂对液晶MLC－LC2000的取向方向及提高预倾角的作用,发现该取向剂有良好的热稳定性。