A New Manganese(Ⅱ) Coordination Compound Constructed by 1,10-Phenanthroline Derivative and Chlorine Anions: Synthesis,Crystal Structure and Theoretical Calculation

The new manganese(Ⅱ) coordination compound, [Mn(Cl)_2(L)_2](1, L = 11-fluorodipyrido[3,2-a:2?,3?-c]phenazine), has been achieved under hydrothermal conditions. The structure of compound 1 was determined by single-crystal X-ray diffraction. 1 crystallizes in monoclinic system, space group C2/c with a = 8.419(2), b = 12.286(2), c = 28.451(6) ?, β = 95.889(3)°, V =2927.5(10) ?~3, Z = 4, C_(36) H_(16) MnF_2 Cl_2 N_8, M_r = 724.41, D_c = 1.644 g/cm~3, F(000) = 1460, μ(Mo Ka)= 0.691 mm~(-1), R = 0.0445 and wR = 0.0982. Adjacent compounds are stacked by one type of π-πinteraction among L ligands to generate a 1D supramolecular chain. Further, the 1D supramolecular chains are stacked by another type of π-π interaction among L ligands to give a 2D supramolecular layer. Moreover, the C-F···π interactions between the carbon atom of the L ligand and the pyrazine ring of the adjacent L ligand further stabilize the supramolecular layer of 1. In addition, natural bond orbital(NBO) analysis has been calculated by the B3LYP/LANL2DZ method, which shows obvious covalent interaction between the coordinated atoms and Mn(Ⅱ) ion.     

过氧化氢催化分解动力学研究

本文主要是对不同条件下二氧化锰和活性炭催化分解过氧化氢动力学进行研究,得出两种催化剂二氧化锰和活性炭催化分解过氧化氢的最适宜条件及有关动力学数据,从而总结出一些有益于科研与教学的结论。     

基于邻菲啰啉衍生物构筑的钴(Ⅱ)配合物[Co(L)2(HL)]·4H2O的合成和晶体结构

通过水热方法合成得到了一种新的钴(Ⅱ)配合物[Co(L)2(HL)]·4H2O(1)(HL=2-(2-氯-6-氟苯基)-1H-咪唑[4,5-f][1,10]邻菲罗啉),并对该配合物进行了元素分析和单晶X射线表征.该配合物属于三斜晶系,空间群P1,晶胞参数a=1.1038(2)nm,b=1.5374(3)nm,c=1.5...     

机械加工误差及提高加工精度分析

机械加工过程中对工件产生误差是不可避免的,但是我们为了提高工件的质量精度,必须减少降低加工过程中的误差,对机械加工过程中产生的误差原因进行记录分析,用大量的实验不断地修正误差提高精度,这是机械加工人必须努力的方向,虽然误差不可消除但是我们努力可以减低到我们能够减低的最小值,这就是我们的成功。     

Synthesis,Crystal Structure and Luminescence of a New Zn(Ⅱ) Dimer: [Zn(bpdc)(L)]_2·4H_2O

A new dimeric compound, [Zn(bpdc)(L)]2·4H2O(1, L = 11-fluoro-dipyrido[3,2-a:2',3'-c]phenazine and bpdc = 1,1'-biphenyl-2,2'-dicarboxylate), has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction. It crystallizes in monoclinic, space group C2/c with a = 23.671(5), b = 22.547(5), c = 13.741(3), β = 123.47(3)o, V = 6118(2) 3, Z = 4, C66H44Cl2F2N8O12Zn2, Mr = 1380.73, Dc = 1.499 g/cm3, F(000) = 2816, μ(MoKa) = 0.949 mm-1, R = 0.0572 and wR = 0.1620. In 1, Zn1 and the symmetry formed Zn1 ions are connected by four bridging bidentate carboxylate groups from two independent bpdc anions to yield a binuclear unit with the Zn···Zn separation by bpdc anions of 4.168. Two L ligands are located on both sides of the dimer in chelating bidentate modes. The lateral L ligands from neighboring dimers are paired through strong π-π interactions to result in a fascinating 1D ladder-like supramolecular array. In addition, neighboring supramolecular ladders are packed each other to yield a 3D supramolecular architecture with a 1D channel.     

Crystal Structure,Thermal Behavior and Luminescence of a New Copper Coordination Polymer Constructed with 4-(Carboxymethoxy)-benzoic Acid

A new Cu(Ⅱ) coordination polymer, [Cu(L1)(L2)](1), was synthesized under hydrothermal conditions(H_2L1 = 4-(carboxymethoxy)benzoic acid, L2 = 2-(4-fluorophenyl)-1 H-imidazo[4,5-f][1,10]phenanthroline). Crystallographic data for 1: triclinic, space group P1 with a = 9.750(5), b = 10.148(5), c = 12.869(5) ?, α = 104.904(5), β = 102.133(5), γ = 95.219(5)°, V = 1188.7(10) ?~3, Z = 2, C_(28)H_(17)FN_4O_5Cu, Mr = 572.01, D_c = 1.598 g/cm~3, F(000) = 582, μ(MoKa) = 0.977 mm~(-1), R = 0.0474 and w R = 0.1144. The TGA behaviors and luminescence of 1 have been studied in detail. The L1 dianions link neighboring Cu(Ⅱ) atoms in a bis-chelating mode, yielding a one-dimensional chain structure along the b axis. The L2 ligands are attached on one side of the chain through chelating the Cu(Ⅱ) atoms, and are stacked with those of an adjacent chain through π-π interactions, yielding a layer structure. Additionally, the N–H???O hydrogen bonds further stabilize the structure of 1.     

3种自选煤样燃烧热的测定

利用燃烧热测定实验的原理和装置,选取3种煤样对其燃烧热进行测定.测定结果表明,一号煤样燃烧最完全,燃烧热也最大,是3个煤样中最好的一种.     

曼斯菲尔德儿童小说恐惧感主题探析

通过分析英国短篇小说家凯瑟琳.曼斯菲尔德的儿童小说代表作《六便士》、《小姑娘》和《累妞儿》中被父母变态管教及伤害、被父母遗弃及被成人残酷迫害和剥削的苦难儿童群像,探讨了其儿童小说的恐惧感主题和创作动机。     

邻菲啰啉衍生物构筑的锌(Ⅱ)配合物:[Zn(L)(PTC)]的合成、晶体结构和荧光性能

采用邻苯二甲酸(H2PTC)为主配体、邻菲啰啉衍生物(L=11-氟-吡啶[3,2-a:2′,3′-c]吩嗪)为辅助配体,在水热条件下制备了一种结构新颖的锌配合物[Zn(L)(PTC)](1).用X射线单晶衍射仪对其结构进行了表征,该配合物属于三斜晶系,P1空间群,晶胞参数a=0.5850(12)nm,b=1.1051(...     

管道超声导波检测技术研究进展

综述管道超声导波检测技术及其应用研究进展。着重对超声导波技术和模态声发射技术在管道检测中的最新应用进行了评述，内容涉及超声导波的传播特性、实验检测方法及其数值模拟等。