Synthesis, Crystal Structure and Luminescent Property of a Novel 1-D Cadmium(Ⅱ) Complex: [Cd2(C8H3NO6)2(H2O)4]n·2nH2O

A novel one-dimensional chain-like coordination polymer constructed from 3-nitrobenzene-1,2-dicarboxylic acid, [Cd2(C8H3NO6)2(H2O)4]n·2nH2O, has been synthesized and its structure was determined by X-ray crystallography method. The crystal belongs to monoclinic, space group P21/c with a = 6.1252(8), b = 20.706(3), c = 8.8067(11) (A), β = 95.608(2)°, V= 1111.6(2)(A)3, Mr =751.12, Dc = 2.244 g/cm3, F(000) = 736, μ = 2.011 mm-1, Z = 2, the final R = 0.0262 and wR = 0.0692for 2338 observed reflections with I ＞ 2σ(I). The structure of the title compound presents a 1-D chain-like structure constructed by dimer units, [Cd2(CsH3NO6)2(H2O)4]n, through two carboxylate oxygen atoms. The fluorescence of the tifle compound has been also discussed in this paper.     

Rational design and syntheses of 0-D, 1-D, and 2-D metal-organic frameworks (MOFs) from ferrocenedicarboxylate tetrametallic macrocyclic building units and subsidiary ligands

We have designed and synthesized three new metal-1,1′-ferrocenedicarboxylate complexes containing tetrametallic macrocyclic building units, namely, [Cd₂(η²-O₂CFcCO₂-η²)₂(phen)₂(H₂O)₂] · 4CH₃OH (1) (Fc = (η⁵-C₅H₄)Fe(C₅H₄-η⁵), phen = 1,10-phenanthroline), {[Cd(η²-O₂CFcCO₂)(pebbm)(H₂O)] · 2H₂O}_n (2) (pebbm = 1,1′-(1,5-pentanediyl)bis-1H-benzimidazole) and {[Cd(η²-O₂CFcCO₂-η²)(prbbm)(H₂O)] · 3H₂O}_n (3) (prbbm = 1,1′-(1,3-propanediyl)bis-1H-benzimidazole). Compound 1 is a 0-D discrete tetrametallic macrocyclic framework. Compound 2 features an infinite 1-D ribbon of rings structure constructed by the subsidiary ligands pebbm connecting tetrametallic macrocyclic building units. For 3, its tetrametallic macrocyclic building units are linked by the subsidiary ligands prbbm to form a 2-D network structure. The structural features of these complexes indicate that the ferrocenedicarboxylate tetrametallic macrocycle can be used as a successful molecular building unit and the shapes and conformational flexibility of subsidiary ligands play a crucial role in the manipulation of the configuration of the resultant MOFs. Their fluorescence spectra in solid state at room temperature suggest that the fluorescence emissions of 1-3 are ruled by 1,1′-ferrocenedicarboxylate ligand.     

Effect of Thermal Cycles on the Thermal Expansion Behavior of T700 Carbon Fiber Bundles

The relationships between the coefficient of thermal expansion(CTE) of T700 carbon fiber bundles(CFBs) and the thermal cycles were investigated. The microstructure of T700 CFBs was analyzed with Raman spectra and XRD before and after the thermomechanical test. The results indicated that the T700 CFBs exhibited negative expansion in the direction of parallel fibers in the temperature range of -150-150℃. The thermal strain that occurred during the heating and the cooling thermal cycle had an unclosed curve that served as the loop. When the experimental load was the same, the position of strain loop tended to move upward, and the length of the specimen increased continuously with the thermal cycles increasing. The microstructural analysis suggested that the degree of structural order and the degree of orientation along the fiber axis were improved with the increase of thermal cycles. The change of microstructure parameters could be the primary cause of the negative CTE's variation within the T700 CFBs.     

高分子量聚苯硫醚树脂的合成

用H_2S、NaOH、p-C_6H_4Cl_2为原料,以Na_3PO_4作助剂,在六甲基磷酰三胺中进行常压缩聚反应4～5 h,得到线型、结晶性的高分子量聚苯硫醚。熔点>290℃,热分解温度>500℃,熔融低切变粘度为0.30～68.0×10~3Pa(303℃测定)。产品直接作抽丝试验,得到高分子量聚苯硫醚纤维。本法设备简单、操作容易、反应体系活性高、溶剂稳定。     

Some applications of analytical TEM to the characterisation of high temperature equipment

Much of the high temperature refinery and power generation equipment currently in use in Australia is typically quite old. In many cases plant has been operating for over 20 years, and in a few cases, for 40+ years. Understanding and predicting the behaviour of service-exposed equipment, which has operated at high temperatures and pressures for extended periods, requires a detailed understanding of the material microstructures and properties. Remaining life assessment of aged plant brings to bear a raft of techniques to measure mechanical properties and to look for damage effects. Analytical transmission electron microscopy (AEM), while not a traditional tool for looking at such problems, can provide some useful insights into the microstructural degradation processes which can occur during service, such as carbide coarsening, secondary precipitation and transformation. This paper will highlight some of the potentially useful information which AEM can provide, along with some of its limitations, with reference to refiner pressure vessels, turbine generating rotors, and superheater outlet headers.     

Calorimetric Studies on the pH Dependence in Hairpin Formation within the Human Enkephalin Enhancer Region

Two complementary 23 base-pair oligomers with sequences analogous to the 3, 5-cyclic adenosine monophosphate (cAMP) inducible enhancer region of the human enkaphalin gene were shown previously⁽⁶⁾ to undergo reversible conformational transformation from duplex to two individual hairpin structures, with two GT and two AC base mismatches, respectively. The present study uses differential scanning calorimetry (DSC) to determine H values for both the dissociation of the duplex formed by the complementary stands and the melting of each hairpin structure. Melting of the hairpins was studied at several different pH values and both the H and cooperative unit (CU) parameters for the hairpin with the AC base mismatches was found to be pH dependent. Increased values for H of melting and cooperative unit size at lower pH values supports the possibility of protonation of adenosine bases and formation of stable AC base pairs in this latter hairpin.     

Synthesis and mesomorphic behavior of a new series of side-chain liquid crystalline polymethacrylates bearing 2,6-naphthylene-based mesogen

A new homologous series of liquid crystalline (LC) polymethacrylates, the poly[ω-(2-phenoxycarbonyl-naphthalene-6-yloxy)alkyl methacrylate]s, in which the length of the alkyl spacer is varied between 3 and 12 methylene units, have been synthesized by free-radical polymerization. The prepared polymers were studied by IR and ¹H-NMR spectroscopy, viscosity measurements, differential scanning calorimetry (DSC), and polarized microscopy. Polymers with 3 or 4 methylene units spacer were glassy in nature, whereas those with 5–12 methylene units spacer exhibited smectic behavior. The glass transition temperatures decrease on increasing spacer length. The isotropization temperatures and the corresponding transition entropies showed an odd–even effect, with the odd members exhibiting the higher values. This effect attenuates on increasing spacer length. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 2391–2399, 1999     

Simultaneous Determination of Polycyclic Aromatic Hydrocarbons by Variable Angle Spectrofluorimetry

Abstract

The use of variable-angle fluorescence spectra together with multilinear curve-fitting techniques for the resolution of mixtures of polycyclic aromatic hydrocarbons (PAHs), is described. Only one spectrum is necessary to determine four compounds in a mixture even when a severe overlap occurs. The PAHs are quantified at ng/ml levels.     

新疆喀什河吉林台水电站地区稳定性研究

新疆喀什河吉林台水电站地区是地壳现代构造运动仍十分活跃的地区，工程的安全有可能会受到断层新活动的威胁，必须提供有关区域稳定性资料作为建设的依据，本文应用显微构造分析，同位素法测年，石英形貌法研究综合确定可能威胁工程的断层最后一次较强烈活动的时间为中更新世晚期，其活动的下限时间是13-20万年，上限时间为9-15万年。结合模拟实验的结果指出，在继续遭受到区域构造应力的作用下，工程区会作整体的抬升，不会产生新的断裂系统和应力集中区，因此选取的工程场址是优良的。