Cr(I)配合物的制备与表征[Cr(CO)4 L] + (L = PH 2 PN(R)PPh 2, pH值2 P(R)PPH 2)用作选择性低聚反应的预催化剂 乙烯,均已报告。通过连续波X波段电子顺磁共振(cw-EPR)和连续波1 H建立了这些复合物在冷冻溶液中的电子性质和结构特征,14 N 和 31 P电子核双共振(cw-ENDOR)光谱。EPR谱主要受g各向异性的影响,两个等效项之间的P A耦合非常大31 P核。自旋哈密顿量参数(摹⊥(g xx = g yy)> g e >摹∥(g zz))与低旋转一致第5天具有C 2v对称性的系统,其中SOMO对所有配合物的金属贡献主要是d xy。对于含配体e,d,f和g的配合物,各向同性的费米接触项(P a iso,由EPR和ENDOR确定)最大,表明SOMO中31 P 3 s特性对于PNP型更高。配体比PCP类型。在配合物细微结构上的差异也通过在
Substituted metal carbonyls. Part 5. Convenient syntheses of some group 6 phosphine and pyridine substituted penta- and tetra-carbonyls and isolation of the singly bridging 1,2-bis(4-pyridyl)ethylene dimetal decacarbonyl complexes
作者:T.S.Andy Hor
DOI:10.1016/s0020-1693(00)85835-1
日期:1988.3
Synthese des complexes M(CO) 5 (L) et M(CO) 4 (P-P) (P-P=Ph 2 PCH 2 PPh 2 , Ph 2 PC 3 H 6 PPh 2 ), Mo 2 (CO) 10 (μ-dppe)
合成配合物M(CO)5(L)和M(CO)4(PP)(PP = Ph 2 PCH 2 PPh 2,Ph 2 PC 3 H 6 PPh 2),Mo 2(CO)10(μ-dppe )
Substituted metal carbonyls XXIII . Syntheses of unicoordinated diphosphine complexes of Cr and Mo and their entry into heterobimetallics MM′(CO)10(μ-P-P) [M, M′ Cr, Mo, W; PP Ph2P(CH2)nPPh2, n = 2–4] as metalloligands
作者:Gan Kim-Suan、Kee Lee Hian、T.S. Andy Hor
DOI:10.1016/0022-328x(93)83146-m
日期:1993.11
pentacarbonyl complexes of chromium and molybdenum with unicoordinated-diphosphines, M(CO)5(η1-P-P) (P-P = dppe, dppp, dppb) has been prepared by amine oxide-induced phosphine substitution of the binary carbonyls. The basicity of the pendant phosphine groups was demonstrated by their ready conversion to the diphosphine-bridged heterobimetallic complexes (OC)5M(μ-P-P)M′(CO)5 (M, M′ Cr, Mo, W; M ≠ M′)
Ligand substitution kinetics in M(CO)4 (η2:2-1,5-cyclooctadiene) complexes (M=Cr, Mo, W) — substitution of 1,5-cyclooctadiene by bis(diphenylphosphino)alkanes
作者:Ceyhan Kayran、Ferda Kozanoglu、Saim Özkar、Saltuk Saldamlı、Ayşin Tekkaya、Cornelius G. Kreiter
DOI:10.1016/s0020-1693(98)00293-x
日期:1999.1
The thermal substitution kinetics of 1,5-cyclooctadiene (COD) by bis(diphenylphosphino)alkanes (PP), (C6H5)2P(CH2)nP(C6H5)2 (n = 1, 2, 3) in M(CO)4(η2:2-COD) complexes (M = Cr, Mo, W), were studied by quantitative FT-IR spectroscopy. The reaction rate exhibits first-order dependence on the concentration of the starting complex, and the observed rate constant depends on the concentration of the leaving
双(二苯基膦基)烷烃(PP),(C 6 H 5)2 P(CH 2)n P(C 6 H 5)2(n = 1,2 )对1,5-环辛二烯(COD)的热取代动力学,3)在M(CO)4(η2 :2-COD)配合物(M = Cr,Mo,W),通过定量FT-IR光谱法进行了研究。反应速率表现出对起始配合物浓度的一级依赖性,并且观察到的速率常数取决于离开的COD配体的浓度以及进入的PP配体的浓度和性质。在所提出的机理中,速率确定步骤是裂解COD配体的一个金属-烯烃键。从提议的机制中得出了利率定律。动力学数据的评估给出了激活参数,这些参数在过渡态下支持缔合机制。观察到的速率常数和活化参数均显示出随二膦配体的链长的变化很小。
Ligand substitution kinetics in M(CO)4(η2:2-norbornadiene) complexes (M=Cr, Mo, W): displacement of norbornadiene by bis(diphenylphosphino)alkanes
作者:Ayşin Tekkaya、Saim Özkar
DOI:10.1016/s0022-328x(99)00458-1
日期:1999.11
The thermal substitution kinetics of norbornadiene (NBD) by bis(diphenylphosphino)alkanes (PP), (C6H5)2P(CH2)nP(C6H5)2 (n=1, 2, 3) in M(CO)4(η2:2-NBD) complexes (M=Cr, Mo, W), were studied by quantitative FT-IR spectroscopy. The reaction rate exhibits first-order dependence on the concentration of the starting complex, and the observed rate constant depends on the concentration of the leaving NBD ligand
双(二苯基膦基)烷烃(PP),(C 6 H 5)2 P(CH 2)n P(C 6 H 5)2(n = 1,2,3)在水中降冰片二烯(NBD)的热取代动力学M(CO)4(η2 :2-NBD)配合物(M = Cr,Mo,W),通过定量FT-IR光谱研究。反应速率表现出对起始配合物浓度的一级依赖性,观察到的速率常数取决于离去的NBD配体的浓度以及进入的PP配体的浓度和性质。在所提出的机理中,存在两个竞争的初始步骤:涉及进入的PP配体与过渡金属中心的连接的缔合反应和涉及二烯烃配体与过渡金属中心的逐步分离的缔合反应。费率定律是从提出的机制中得出的。活化参数是从动力学数据的评估中获得的。发现在进入配体的浓度较高时,缔合路径占主导地位,而在较低浓度下,解离路径的贡献变得显着。观察到的速率常数和活化参数都显示出随二膦配体的链长的显着变化。
Rapid synthesis of Group VI carbonyl complexes by coupling borohydride catalysis and microwave heating
作者:Kurt R. Birdwhistell、Brian E. Schulz、Paula M. Dizon
DOI:10.1016/j.inoche.2012.09.030
日期:2012.12
tetracarbonyl phosphine and tertiary amine complexes [M(CO)4 L2, M = Cr, Mo, W, L2 = 2PPh3, dppm, dppe, dppp, dppb, bpy, phen, dppf] were synthesized in minutes in the microwave at moderate temperature, atmospheric pressure, and utilizing NaBH4 as a catalyst. The reactions were optimized by careful solvent selection. The octahedral complexes were isolated in percent yields ranging from 17 to 95. The
摘要 在几分钟内合成了几种 VI 族四羰基膦和叔胺配合物 [M(CO)4 L2, M = Cr, Mo, W, L2 = 2PPh3, dppm, dppe, dppp, dppb, bpy, phen, dppf]在中等温度、大气压下进行微波,并利用 NaBH4 作为催化剂。通过仔细选择溶剂来优化反应。八面体配合物以 17 到 95% 的产率被分离出来。与传统的热合成相比,更低的温度、更短的反应时间、温和的溶剂和更低的压力为这些常见的 VI 族配合物提供了一种快速、环保的合成途径.