Study of zinc thiocarbamide chloride,a single-source precursor for zinc sulfide thin films by spray pyrolysis

Thermal decomposition of the title compound, Zn(tu)₂Cl₂ (tu=thiourea), was studied up to 1200°C in dynamic inert (N₂) and oxidative (air) atmospheres using simultaneous TG/DTA techniques. In addition, XRD and IR were employed ex situ to resolve the reaction mechanism and products. Cubic ZnS (sphalerite) is formed below 300°C in both atmospheres and is observed until 760°C, whereafter it transforms in nitrogen to the hexagonal ZnS (wurtzite). EGA by FTIR revealed the complexity of the decomposition reactions involving also the evolution of H₂NCN, which reacts to form hexagonal ZnCN₂ as revealed by an XRD analysis. This revised version was published online in July 2006 with corrections to the Cover Date.     

聚苯乙烯—钛酸钡复合材料介电性能的研究

以聚苯乙烯与化学沉淀法钛酸钡陶瓷为基本组成，采用溶液共混，溶液聚合，表面处理后溶液聚合三种方法进行复合，发现后两种复合的钛酸钡颗粒表面发生界面变化，形成活性界面，使得溶液聚合法和表面处理后溶液聚合所得到的材料具有较低的介电损耗，在高频下能保持较高的介电系数。     

溴化锌-季(鎓)三溴盐催化二氧化碳和环氧化合物偶联反应

研究了溴化锌-季鎓三溴盐催化二氧化碳和环氧化合物偶联反应,考察了反应温度、压力和不同金属盐对反应的影响以及催化剂的循环使用性能.结果表明,在413 K和1.0 MPa条件下,以溴化锌为催化剂,苯基三甲基三溴化铵为共催化剂,无需加入任何溶剂就可以使二氧化碳和环氧化合物发生偶联反应,并以很高的收率得到环碳酸酯.     

Cu－Zn／γ－Al2O3催化剂的制备及其在选择加氢反应中的催化性能

 通过浸渍法制备了不同Cu／Zn比的γ－Al2O3和改性γ－Al2O3负载的Cu－Zn催化剂，并用XRD，XPS和SEM等手段对催化剂进行了表征．XRD表征结果表明，还原活化前催化剂中的Cu和Zn分别以CuO和ZnO的形式存在；还原活化后Cu以单质的形式存在；催化剂失活后，单质Cu又转变成CuO．XPS和SEM分析结果表明，催化剂中金属的价态及颗粒的形貌在反应前后发生了变化．所制备的催化剂在糠醛加氢制糠醇反应中表现出较高的选择性．用Co改性的γ－Al2O3负载的Cu－Zn催化剂不仅具有较高的催化活性和选择性，而且还呈现出较长的寿命．催化剂中的Cu晶相是催化活性中心；催化剂中的Cu晶相转变成CuO和烧结是催化剂失活 的主要原因．     

Thermal transformations in systems based on zeolites Y,X, and A containing zinc and sodium nitrates

Thermal transformations in systems formed by interaction of Zn and Na nitrates with Y, X, and A zeolites were studied by TG—DTA technique. Temperature regions of existence of adsorbed water, water of crystallization, and decomposition of NO₃ ^– anion were determined. These intervals depend on the composition, structure, method of preparation, and pre-treatment conditions of zeolite systems. The extent of NO₃ ^– decomposition depends not only on the zinc and sodium content but also on the presence of ammonia involved in NO₃ ^– reduction. The zeolite matrix strongly stabilizes the occluded NO₃ ^– anions. A portion of zinc oxide formed by zinc nitrate decomposition is probably localized inside the zeolite cavities as the [Zn—O—(ZnO) _n —Zn]²⁺ particles. The latter compensate charges of the isolated [AlO₄]^– tetrahedra.     

二氰基二硫纶和邻菲罗啉二酮的镍(Ⅱ)、铜(Ⅱ)、锌(Ⅱ)配合物的合成与性质

二氰基二硫纶和邻菲罗啉二酮的镍（Ⅱ）、铜（Ⅱ）、锌（Ⅱ）配合物的合成与性质彭正合＊潘庆才ａ任小明ｂ张克立秦子斌（武汉大学化学系，武汉４３００７２；ａ南京大学配位化学国家重点实验室，南京２１００９３）关键词：二硫纶邻菲罗啉二酮镍铜锌二硫纶（ｄｉｔｈｉｏ...     

锌和锡参与下末端环氧化物的选择性烯丙基化反应

烯丙基溴和金属辛或锡成功地将末端环氧化合物1一锅法合成高烯丙基醇2和双高烯丙基醇3. 还研究了环氧化合物取代基的影响, 并提出了此烯丙基化的反应途径 .     

Crystal structure of sodium potassium zinc diphosphate NaKZnP2O7

Single crystals of NaKZnP₂O₇ were grown, and their crystal structure was determined by X-ray diffraction (space group P2₁/n, a = 12.585(5) Å, b = 7.277(5) Å, c = 7.428(5) Å, β = 90.00(5)°, Z = 4, 1916 F(hkl), R ₁ = 0.0461). The structure contains a 3D tetrahedral zinc phosphate framework with a system of intersecting channels running along the b and c axes. The sodium and potassium atoms are coordinated to six and seven oxygen atoms, respectively, and reside inside these channels; the potassium cations, which are larger than the sodium cations, are located at channel intersections.     

Einfache Trithio- und Perthiocarbonatokomplexe mit interessanter Koordinationschemie: [E(CS3)2]2− (E = Sn,Zn, Cd), [E(CS3)3]3− (E = As,Sb, Bi,Co), {Cu(CS3)−}∞ und [Zn(CS4)2]2−

Simple Trithio- and Perthiocarbonato Complexes with Interesting Bond Properties: [E(CS₃)₂]^2? (E = Sn, Zn, Cd), [E(CS₃)₃]^3? (E = As, Sb, Bi, Co), {Cu(CS₃)^?}_∞ and [Zn(CS₄)₂]^2? By reactions of potassium trithiocarbonate ( 1 ) with solutions of zinc(II)- acetylacetonate, cadmium(II)-chloride, tin(II)-chloride, arsenic(III)-sulfide (suspension), antimony(III)-chloride, bismuth(III)-chloride and copper(II)-chloride in dimethyl sulfoxide, as well as of trisodium hexanitrito cobaltate(III) in water, and the precipitation of the complexes with an aqueous solution of tetraphenylphosphonium chloride the compounds (PPh₄)₂[Zn(CS₃)₂] ( 2 ), (PPh₄)₂[Cd(CS₃)₂] ( 3 ), (PPh₄)₂[Sn(CS₃)₂] ( 4 ), (PPh₄)₃[As(CS₃)₃] ( 5 ), (PPh₄)₃[Sb(CS₃)₃] ( 6 ), (PPh₄)₃[Bi(CS₃)₃] ( 7 ), (PPh₄)₃[Co(CS₃)₃] ( 8 ) and (PPh₄)Cu(CS₃) ( 9 ) have been isolated. (PPh₄)₂[Zn(CS₄)₂] · CH₃NO₂ ( 10 ) has been prepared by heating a solution of 2 in nitromethane to 60--70°C in presence of air. The reaction of 1 in dimethyl sulfoxide with an aqueous tetraphenylphosphonium chloride solution in presence of oxygen leads to (PPh₄)₂[C₂S₆] ( 11 ). The compounds have been characterized by spectroscopical studies (IR, Raman, UV/Vis, ¹¹³Cd/⁵⁹Co-NMR), magnetic susceptibility measurements, powder diffractometry, elemental analyses and single crystal X-ray structure analysis ( 4 – 7 , 10 and 11 ). The difficult growing of single crystals has been reported in detail. For crystal data see Inhaltsübersicht.     

Ligand exchange separation of amines on copper (II) sorbed on zinc silicate

Summary Papers impregnated with Cu(II) sorbed on zinc silicate have been used to study the ligand exchange chromatographic behavior of amines. R_F values of 16 amines have been studied in 6 different systems. On the basis of differences in R_F values various analytically important qualitative separations of amines on impregnated papers and quantitative separations on columns of copper(II) sorbed on zinc silicate have been achieved.