Preparation and Characterization of a Cobalt‐Containing Mono‐Phosphine Ligand and its Coordinated Molybdenum Complex

A cobalt‐containing monodentate phosphine [(μ₂‐PPh₂CH₂PPh₂‐κ²P)Co₂(CO)₄][μ₂‐η²‐PhC≡CP(i‐Pr)₂] 2f , was prepared from the reaction of (μ₂‐PPh₂CH₂PPh₂‐κ²P)Co₂(CO)₆ 1 with PhC≡CP(i‐Pr)₂. It was accompanied by an oxidized compound, [(μ₂‐PPh₂CH₂PPh₂‐κ²P)Co₂(CO)₄][μ₂‐η²‐PhC≡CP(=O)(i‐Pr₂)] 2fo during the chromatographic process. Further reaction of 2f with Mo(CO)₆ resulted in the formation of a 2f ‐ligated molybdenum complex 4 , [(μ₂‐PPh₂CH₂PPh₂‐κ²P)Co₂(CO)₄][μ₂‐η²‐PhC≡CP(i‐Pr₂)‐κP]‐Mo(CO)₅.     

一种新型的磷化钼加氢精制催化剂的研究

通过(NH4)Mo7O24·4H2O和(NH4)2HPO4水溶液沉淀、焙烧在923K用H2还原制得磷化钼催化剂.XRD检测表明,用H2还原后有纯的磷化钼生成.在3.0MPa的高压连续微反系统中测定催化剂的加氢活性.以制备的磷化钼为活性组分、γ-Al2O3为稀释剂,考察了空速、反应温度和反应时间对模型化合物的HDN、HDS和HDY性能的影响,结果表明:在合适的条件下,其脱硫脱氮率可达到90%以上.模型化合物为吡啶、噻吩和环己烯,吡啶含量以N计(为0.2%)、噻吩含量以S计(为0.3%),环己烯含量为20%,以环己烷作溶剂.     

溴化十二烷基吡啶和羟胺协同增敏显色反应的研究

系统地研究了钼－羟胺（ＨＹ）－邻苯二酚紫（ＰＶ）－溴化十二烷基吡啶（ＤＰＢ）体系的四元胶束混配物协同增敏显色反应。在ｐＨ４￣５的弱酸性条件下，Ｍｏ－ＰＶ二元配合物生成速率很慢，须加热才能完成，最大吸收波长λｍａｘ＝５１０ｎｍ，表观摩尔吸光系数εｍａｘ＝６．１×１０＾４Ｌ·ｍｏｌ＾－１·ｃｍ＾－１；Ｍｏ（Ⅵ）－ＰＶ－ＤＰＢ配合物在室温下缓慢形成１：１：１的配合物，最大吸收波长为５９０ｎｍ，表观摩尔吸     

一种甲醇直接气相羰基化新催化剂

本世纪７０年代Ｍｏｎｓａｎｔｏ公司成功开发了甲醇液相羰化ＲｈＩ催化体系，使甲醇羰化生产醋酸成为重要的工业过程．然而，由于此工艺产物与催化剂分离复杂、铑资源紧缺以及体系中还必须加大量的碘甲烷（或氢碘酸）作促进剂，设备腐蚀严重．８０年代以来，甲醇气相羰...     

SiO_2负载钼催化剂的合成及其催化乙烯二聚、同系化和歧化的反应性能

从单核及双核二甲胺钼络合物出发,制备了SiO_2负载的钼催化剂。程序升温分解实验(TPDE)及红外测试表明,双核钼络合物与SiO_2作用生成双钼中心物种,此物种可催化乙烯的二聚反应。280℃活化后此双钼中心物种变成单钼中心物种,单钼物种只催化乙烯的同系化及歧化反应。     

铜离子交换改性的沸石催化剂上甲烷的非氧芳构化

已有研究表明，ＭｏＯ３／ＨＺＳＭ５是甲烷非氧芳构化的优良催化剂，在９７３Ｋ下甲烷转化率达６％～８％，苯选择性高于８０％，这为非氧气氛下甲烷的芳构化反应展示了非常诱人的前景［１～１２］．但是，该催化剂的活性和稳定性尚有待进一步提高，目前已有使用Ｐｔ，...     

用钐和四氯化钛体系一锅法合成咪唑烷衍生物

在四氢呋喃溶液中,用Sm/TiCl4体系还原亚胺合成了咪唑烷衍生物.发现当没有促进剂1,2-二溴乙烷时,咪唑烷衍生物的产率小于20%,加入1,2-二溴乙烷后,产率大大提高.产物的结构通过IR,1HNMR和MS光谱确证.根据实验结果提出了一个可能的反应机理.     

N-heterocyclic carbenes as ligands in high-valent molybdenum and tungsten complexes

Oxometal complexes of molybdenum and tungsten in high oxidation states from stable adducts with 1,3-dimethylimidazoline-2-ylidene (L) 1. The first ‘carbene’ complexes of molybdenum(VI) [MoO₂Cl(L)₃]Cl (3a) and tungsten(VI) WO₂Cl₂(L)₂ (4b) are reported.     

Syntheses, structures and third-order non-linear optical properties of homometal clusters containing molybdenum

Both the homometal cluster [P(ph₄)]₂[Mo₂O₂(μ-S)₂(S₂)₂] (1) and [Mo₂O₂(μ-S)₂(Et₂dtc)₂] (2) (Et₂dtc=diethyl-dithiocarbamate) were successfully synthesized by low-temperature solid-state reactions. X-ray single-crystal diffraction studies suggest that compound (1) is a dinuclear anion cluster, and compound (2) is a dinuclear neutral cluster. The two compounds were characterized by elemental analyses, IR spectra and UV-Vis spectra. The third-order non-linear optical (NLO) properties of the clusters were also investigated and all exhibited nice non-linear absorption and self-defocusing performance with moduli of the hyperpolarizabilities 5.145×10⁻³⁰ esu for (1) and 5.428×10⁻³⁰ esu for (2).