Carbodithioato derivatives of weak nitrogenous nucleophiles II. Non-direct syntheses and structural studies of Ni(II) N-carbodithioates with substituted ureas, carbamic esters and sulfonamides
Abstract In a sequence to out earlier reports on electrophilic substitution reactions of Ni(II) N -alkyldithio- carbamates, we here report the isolation of nickel(II) complexes of the type Ni[S 2 CN(E)R] 2 , (E = electrophile), and their characterization by chemical analysis, as well as magnetic and spectral studies. A thorough inspection of the spectroscopic and magnetic data of the novel compounds
摘要在一系列有关Ni(II)N-烷基二硫代氨基甲酸酯的亲电取代反应的早期报道中,我们在此报告了Ni [S 2 CN(E)R] 2型镍(II)配合物的分离,( E =亲电试剂),并通过化学分析,磁和光谱研究对其进行表征。对新化合物的光谱和磁学数据的彻底检查清楚地表明了该复合物中碳二硫代脲配体的二齿键合模式及其正方形平面构型。因此,所有新化合物都具有大致相似的结构,包括方形NiS 4发色团。
Synthesis of Transition Metal Arsenides and Arsenic Metal Sulfides and Their Role in the Dearsenation of Shale Oils
作者:G.H. Singhal、L.D. Brown、D.F. Ryan
DOI:10.1006/jssc.1994.1095
日期:1994.4
upgrading shale oil is the presence of inherent arsenic, which is known to poison downstream catalysts. Highly dispersed transitionmetalsulfides formed in situ from the decomposition of dithiocarbamate (DTC) complexes of transitionmetals show excellent potential as dearsenation agents. We have studied the reaction of these sulfides with various arsenic compositions, and characterized the metal arsenides
页岩油升级的主要问题之一是固有砷的存在,已知该砷会毒害下游催化剂。高度分散的形成过渡金属硫化物原位从二硫代氨基甲酸的分解器(DTC)的过渡金属配合物表现出优异的电势作为dearsenation剂。我们已经研究了这些硫化物与各种砷成分的反应,并表征了形成的金属砷化物和砷金属硫化物以及其形成的难易程度。因此,双(丁基二硫代氨基甲酸酯)Ni(NiBuDTC)与模型化合物的反应非常容易,得到NiAs,NiAsS和NiAs 2- x S x。通常,硫化物的脱砷效果遵循Ni> Mo⪢Co的顺序,而硫化铁则完全无效。根据这些结果,使用Ni BuDTC和具有73 ppm固有砷的页岩油在高压釜(以及固定床流通装置)中进行测试。在最佳条件下,脱砷率可降至1 ppm以下。
Carbodithioato derivatives of weak nitrogenous nucleophiles
Mass spectral and thermal studies by TG/DTG analysis of Ni[S2CN(E)R]2 complexes (where E is CONHPh, CONPh2, COOEt or ArSO2, and R is Me, Bu(n) or Bz) in dynamic nitrogen atmosphere have been carried out to determine their modes of decomposition. In this respect, fragmentation patterns are given and possible mechanisms are discussed. Reaction orders were estimated employing the Freeman-Carroll equation. A kinetic analysis of the thermogravimetric data was performed using the Coats-Redfern equation to determine the apparent activation energies and the pre-exponential factor of the Arrhenius equation.
Formation of Transition Metal Sulfides by the Decomposition of Their Dithiolato Complexes
作者:G.H. Singhal、R.I. Botto、L.D. Brown、K.S. Colle
DOI:10.1006/jssc.1994.1086
日期:1994.3
successive decomposition of complexes and, consequently, the pathway for the formation of final sulfides could be established. In this work it was found that the metal, type of ligands, and atmospheric environment are all important parameters in the formation of sulfides upon thermolysis. This study suggests that by judicious selection of these parameters, many desired transitionmetal sulfides can be prepared