D.C. conduction phenomenon and spectrum of a novel bis(7-formyl-8-hydroxyquinoline) zinc complex

A novel bis(7-formyl-8-hydroxyquinoline)zinc complex was prepared from 7-formyl-8-hydroxyquinoline. This compound was characterized on the basis of elemental analysis, i.r., ¹H nuclear magnetic resonance, magnetic moment and conductivity measurements. The compound was a non-conductor in dimethylformamide. A tentative structure for this compound is suggested. The electrical conductivity at various temperatures for an annealing time of 1 h has been measured. The activation energy of this compound is found to be 0.68 eV. Conduction parameters including the Schottky coefficient (_s), Schottky electrode barrier (_s), jump distance (d) and dielectric constant () have been determined. The aim of this study is also to understand the mechanism of conduction of this zinc(II) complex.     

Photo and electroluminescence of a platinum porphyrin doping of complexes with two metal cores

In this paper, four new complexes with two metal cores [2Sm, 2Sn, 2Zn and 2Pb] were prepared and utilized as host material in in the electroluminescence (EL) devices. Devices with two metal cores and with the structure of ITO/PEDOT: PSS (60 nm)/PVK (55 nm)/[2Sm, 2Sn, 2Zn and 2Pb]: %8 [2,5PtTPP] (45 nm)/Al (200 nm) were fabricated, A blue–green photoluminescence (PL) emission with a blue shift compared to the 2,5PtTPP was observed. 2,5PtTPP doped in 2Sm and 2Sn showed more pure red color compared to 2Zn and 2Pb based devices. We believe that energy transfer occurring at 2,5PtTPP/[2Sm, 2Sn] molecules is responsible for the red color in the EL of the device. The electronic effect of two metal cores of complexes influenced the maximum current density, brightness, and luminous efficiency of the devices. Finally, we have demonstrated the samarium complex of 8-hydroxyquinoline is a promising host material for red OLEDs with high efficiency and has a simple device structure.     

Liq的合成和提纯及蓝色OLED的试制

报导了8-羟基喹啉锂（Liq）的合成及其提纯方法；用元素分析、X射线衍射谱、紫外吸收光谱对提纯后的样品性能进行表征；研制了结构为ITO／PVK：TPD／Liq／Al的蓝色发光器件，用原子力显微镜分析了纯度与Liq薄膜的表面形态及器件发光性能间的关系，并且也研究了其光致发光和电致发光特性。     

Synthesis of a neodymium-quinolate complex for near-infrared electroluminescence applications

A structurally pure, near-infrared emissive Nd-(5,7-dichloro-8-hydroxyquinoline)₄ tetrakis complex has been synthesized. When incorporated as a dopant in the blue emissive, hole conducting polymer poly(N-vinylcarbazole), PVK, sensitized neodymium ion emission was observed following photo-excitation of the polymer host. OLED devices were fabricated by spin-casting layers of the doped polymer onto glass/indium tin oxide (ITO)/3,4-polyethylene-dioxythiophene-polystyrene sulfonate (PEDOT) substrates. An external quantum efficiency of 1 × 10^− 3% and a near-infrared irradiance of 2.0 nW/mm² at 25 mA/mm² and 20 V was achieved using glass/ITO/PEDOT/ PVK:Nd-(5,7-dichloro-8-hydroxyquinoline)₄/Ca/Al devices.     

固相合成β-PbO纳米粉体及相关过程的研究

利用醋酸铅分别与８－羟基喹啉、柠檬酸、草酸在低加热条件下进行固－固相配位反应,首先合成了不同的前驱配合物,进而经不同的热分解历程得到了纳米量级β－ＰｂＯ粉体（黄色）．利用元素分析、热重／差热分析对固相配位反应的可行性作了讨论．借助Ｘ射线衍射、透射电镜测试对合成的纳米粉体的物理性质作了表征．     

吲哚啉螺萘并(噁)嗪光致变色化合物的合成研究

以β-萘酚经亚硝化反应得到中间体1-亚硝基-2-萘酚;以苯肼、3-甲基-2-丁酮为原料合成得到2,3,3-三甲基-3H-吲哚,经碘甲烷季铵盐化后在碱性条件下与1-亚硝基-2-萘酚反应得到1,3,3-三甲基吲哚啉螺萘并(噁)嗪光致变色化合物.通过1H NMR、IR和元素分析确证了中间体和目标分子的结构;讨论了温度对1-亚硝基-2-萘酚合成的影响、制备吲哚季铵盐时溶剂的选择以及目标化合物的合成与光致变色机理.目标化合物的甲醇溶液经紫外光照射后由无色变为淡兰色,显示了良好的光致变色性能.     

Thallium I phenylsuccinic acid coordination polymer as precursor for preparation of thallium (III) oxide nano structures by direct thermal decomposition

A new thallium (I) coordination polymer [Tl(PsucH)] _n (PsucH = phenylsuccinic acid) has been synthesized and characterized by single crystal X-Ray analysis, elemental analysis and IR spectroscopy. The single crystal X-Ray analysis shows that this polymer is 2-D along a axis. Flower-like nanostructure thallium (III) oxide, Tl₂O₃ has been prepared by direct thermal decomposition of thallium (I) coordination polymer. The nanostructure was characterized by scanning electron microscopy (SEM), X-Ray powder diffraction (XRD) and IR spectroscopy. The thermal stability of the Tl₂O₃ nanostructure was studied by thermal gravimetric analysis and differential thermal analysis (TGA /DTA) too.     

1,3,3-Trinitroazetidine (TNAZ), a melt-cast explosive: synthesis, characterization and thermal behaviour

1,3,3-Trinitroazetidine (TNAZ) has been prepared at a laboratory scale in HEMRL. The structure of the compound has been confirmed by IR, NMR, mass, elemental analysis and by X-ray crystallography. HPLC technique has been employed to confirm the purity of TNAZ (>99%). The compound is further characterized by thermal techniques and is found to undergo limited decomposition at its melting point. Small scale sensitivity tests have also been carried out and the results show that TNAZ is significantly more sensitive to mechanical stimuli than TNT.     

Structure, charge-transfer and luminescent properties bis(2-methyl-8-hydroxyquinoline) gallium chloride

Bis(2-methyl-8-hydroxyquinoline) Gallium Chloride (GaMq2Cl) has been synthesized and characterized by X-ray crystallography. It is known from X-ray diffraction data on single crystals that the crystals of GaMq2Cl were monoclinic, space group C2/c, a = 28.701 A, b = 9.5405 A, c = 15.1434 A, Z = 8. Its thermal stability, electron structures and structural stability were investigated by TG analysis and quantum chemical calculations. The complex was a thermally stable material, with decomposition temperature being 348 degrees C. The electron-transfer property of GaMq2Cl is of advantage over hole-transfer property. Under UV excitation at 365 nm, the complex emits blue fluorescence with the maximum emission peak at 471 nm. Finally, blue-green light-emitting devices using this complex as the emissive layer were also fabricated and investigated, with emission wavelength at 502 nm. The results promote GaMq2Cl as a good candidate for luminescent material.     

Graphene nanocomposite for biomedical applications: fabrication, antimicrobial and cytotoxic investigations

Materials possessing excellent bacterial toxicity, while presenting low cytotoxicity to human cells, are strong candidates for biomaterials applications. In this study, we present the fabrication of a nanocomposite containing poly(N-vinylcarbazole) (PVK) and graphene (G) in solutions and thin films. Highly dispersed PVK-G (97-3 w/w%) solutions in various organic and aqueous solvents were prepared by solution mixing and sonication methods. The thermal properties and morphology of the new composite were analyzed using thermal gravimetry analysis (TGA) and atomic force microscopy (AFM), respectively. PVK-G films were immobilized onto indium tin oxide (ITO) substrates via electrodeposition. AFM was used to characterize the resulting topography of the nanocomposite thin films, while cyclic voltammetry and UV-vis were used to monitor their successful electrodeposition. The antimicrobial properties of the electrodeposited PVK-G films and solution-based PVK-G were investigated against Escherichia coli (E. coli) and Bacillus subtilis (B. subtilis). Microbial growth after exposure to the nanocomposite, metabolic assay and live-dead assay of the bacterial solutions exposed to PVK-G presented fewer viable and active bacteria than those exposed to pure PVK or pure graphene solutions. The PVK-G film inhibited about 80% of biofilm surface coverage whereas the PVK- and G-modified surfaces allowed biofilm formation over almost the whole coated surface (i.e. >?80%). The biocompatibility of the prepared PVK-G solutions on NIH 3T3 cells was evaluated using the MTS cell proliferation assay. A 24?h exposure of the PVK-G nanocomposite to the NIH 3T3 cells presented ～80% cell survival.     

Synthesis and characterization of Znq2 and Znq2:CTAB particles for optical applications

High luminescent zinc (ii)-bis (8-hydroxyquinoline) Znq2 nanoparticles were synthesized by the simple precipitation method in pure form and with cetyltrimethyl ammonium bromide (CTAB) as cationic surfactant. The crystalline nature of title samples was confirmed by powder X-ray diffraction. Thermo gravimetric analysis and differential thermal analysis were carried out to find the thermal stability of the synthesized samples. The morphology and elemental analyses of the samples were studied by scanning electron microscope and energy dispersive X-ray analyser, respectively. The functional groups of these nanoparticles were analysed and assigned using the Fourier transform infrared spectroscopy spectral study. The optical property of Znq2 and Znq2:CTAB was confirmed by UV–vis–NIR spectral study. The band gap of Znq2 was calculated. The synthesized Znq2 and Znq2:CTAB nanoparticles were confirmed by photoluminescence studies for organic-light-emitting diode applications as emission and electron transport layers.     

Synthesis of preceramic organomagnesiumoxanealumoxanes

Preceramic organomagnesiumoxanealumoxanes hydrolytically stable in air and soluble in organic solvents, exhibiting fiber-forming properties at Al: Mg molar ratios of 2: 1 and 1: 1, have been synthesized for the first time. The physicochemical properties of the organomagnesiumoxanealumoxanes and ceramic samples prepared from them have been studied by a variety of techniques (nuclear magnetic resonance, IR spectroscopy, scanning electron microscopy, thermogravimetric analysis, X-ray diffraction, and elemental analysis).     

Synthesis and thermal decomposition of cadmium dithiocarbamate complexes

Cadmium(II) complexes of new polydentate dithiocarbamates with benzyl or methylferrocene as substituents have been prepared. The IR spectra of the complexes suggested a bidentate coordination of dithiocarbamate ligands to the cadmium ion. The thermal properties of cadmium complexes were studied by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Pyrolysis of cadmium complexes was further carried out at 700 °C and the products were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). The pyrolysis of cadmium methylferrocene complex produced a product with nanofibers.     

2,2,2-胺三乙酰二苄胺及其稀土配合物的合成、表征与荧光性质

为研究三脚架型配体稀土配合物的组成、可能的配位状态及荧光性质,合成了三脚架型配体--2,2,2-胺三乙酰二苄胺(L)及其6个稀土配合物.通过红外光谱、核磁共振波谱、元素分析、差热-热重分析、摩尔电导率及荧光光谱等方法对L及其稀土配合物的组成及性质进行了表征.结果表明, L能够与稀土离子配位,生成n(RE)∶n(L)=1∶1的配合物;Tb(Ⅲ)配合物在紫外光激发下,在490nm、545nm、590nm、620nm附近出现强度不同的Tb3+特征荧光发射峰,分别归属于Tb3+的5D4→7F6、5D4 →7F5、5D4→7F4、5D4→7F3能级跃迁;而其Eu(Ⅲ)配合物的荧光发射微弱,其它配合物没有荧光发射.说明L的三重态能量与Tb3+最低激发态能级匹配较好,能起到较好的敏化作用,提高Tb3+的发光强度.     

Pure red emission hybrid light-emitting devices based on the blend of CdSe/ZnS quantum dots and an n-type polymer

We report on hybrid light-emitting devices (HLEDs) based on CdSe/ZnS quantum dots in polymer matrices. Color purity of the HLED with a mixed matrix consisting of polyvinylcarbazole (PVK) and 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) improves with the increasing concentration of PBD. We attribute this improvement to the increased electron mobility of the matrix. By using an n-type cyano-containing polymer derived from 6-(3,6-dibromo-9H-carbazol-9-yl)hexanenitrile and tetraphenylsilane to replace PVK:PBD as the matrix, further pure red emission with Commission Internationale De L'Eclairage coordinates of (0.67, 0.33) and maximum external quantum efficiency of 2.51% has been achieved.     

A novel heteroleptic iridium complex with multifunctional ligands used for polymeric light-emitting diodes

A novel iridium complex using 3-(5-(4-(pyridin-2-yl)phenyl)-1,3,4-oxadiazol-2-yl)-9-hexyl-9H-carbazole containing both hole-transporting group and electron-transporting group as main ligand and 2-(5-p-tolyl-2H-1,2,4-triazol-3-yl)pyridine as ancillary ligand was synthesized and investigated in this paper. The iridium complex possesses high solubility, high thermal stability with 5% weight-reduction temperature (ΔT_5%) of 390 °C and glass-transition temperature (T_g) of 218 °C. Polymeric light-emitting diodes (PLEDs) based on structure of ITO/PEDOT: PSS/PVK: PBD: iridium complex/TPBI/CsF/Al fabricated by solution-processed technology were measured. The PLED using the iridium complex as phosphorescent dopant at 4 wt.% doping concentration is optimal which shows the maximum luminance of 7746 cd·cm⁻², maximum current efficiency of 14.0 cd A⁻¹ and maximum external quantum efficiency of 5.8% with CIE coordinates of (0.48, 0.50). The EL emission originates from both monomers and exciplexes formed from the iridium complex and PVK.     

苯乙烯基四配位硅均聚物的制备及结构表征

首先以五配位硅钾化合物与对苄氯苯乙烯反应制备出苯乙烯基四配位硅单体;然后进行自由基溶液聚合得到苯乙烯基四配位硅均聚物;最后对单体及聚合物进行红外光谱(IR)、元素分析(EA)、能谱元素分析(EDS)、热重分析(TG)、差示扫描量热谱(DSC)、凝胶渗透色谱法(GPC)等结构表征与性能测试。IR表明单体在1629.6cm-1处的C=C双键伸缩振动吸收峰在均聚物中消失;TG表明均聚物在239℃才开始失重;DSC表明均聚物的玻璃化转变温度为32.8℃;GPC分析表明均聚物的数均分子量-Mn=67504,质均分子量M-w=88532,分散系数为1.31。     

Formation of B2 intermetallic NiAl and FeAl by mechanical alloying

Nanostructud B2 intermetallic compounds NiAl and FeAl have been prepared by mechanical alloying (MA) the elemental powder mixtures and subsequent heating. The structural evolution during MA was monitored by in situ thermal analysis and X-ray diffraction (XRD). The final products were characterized by transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). The results show that the nanocrystalline intermetallic compound NiAl, which is difficult to disorder by milling, was synthesized directly after an exothermic explosive reaction; whereas FeAl compound was formed after a thermal process of asmilled Fe(Al) solid solution obtained through interdiffusion during MA. The large heat of formation of NiAl compound is the main driving force for the exothermic explosive reaction, and the difference in diffusivity between NiAl system and FeAl system is suggested to be the main cause of the different behaviors of formation between NiAl and FeAl compounds by MA.     

1,1,7,7-四甲基久洛尼定的合成

以苯胺和1-氯-3-甲基-2-丁烯为原料,合成了1,1,7,7-四甲基久洛尼定,用1HNMR和元素分析对其结构进行了确认.     

Cost-effective synthesis of 5,7-diamino-4,6-dinitrobenzofuroxan (CL-14) and its evaluation in plastic bonded explosives

5,7-Diamino-4,6-dinitrobenzofuroxan (CL-14) has been synthesized by a cost-effective method. CL-14 was characterized by spectral data (IR, NMR and mass) and elemental analysis. The compound was evaluated in plastic bonded explosives (PBX) using polyurethane (PU) as binder. The thermal, mechanical and explosive properties of PBX composition from preliminary tests are also reported. Good thermal stability as well as good insensitiveness are indicated.