Synthetic and structural studies of the mononuclear nickel(II) ethanedithiolate complexes with chelating N-substituted bis(diphenylphosphanyl)amine
摘要:
Four nickel(II) ethanedithiolate complexes with chelating N-substituted bis(diphenylphosphanyl)amine RN(PPh2)(2) were prepared and structurally characterized. Reactions of the mononuclear nickel(11) dichloride complexes [RN(PPh2)(2)]NiCl2 [R = CH(CH3)(2), 1; CH2CH(CH3)(2), 2; CH2CH2CH2CH3, 3; CH2Ph, 4] with 2,3-butanedithiol [HSCH(CH3)CH(CH3)SH] in the presence of triethylamine in CH2Cl2 afforded the mononuclear nickel(II) ethanedithiolate complexes [RN(PPh2)(2)]Ni[SCH(CH3)CH(CH3)S] [R = CH(CH3)(2), 5; CH2CH(CH3)(2), 6; CH2CH2CH2CH3, 7; CH2Ph, 8] in 44-71% yields. All the new complexes 5-8 have been characterized by H-1 NMR,P-31{H-1} NMR, C-13{H-1} NMR and HR-MS spectroscopy, as well as by X-ray diffraction analysis. (C) 2014 Elsevier Ltd. All rights reserved.
Ethylene Tetramerisation: A Structure‐Selectivity Correlation
作者:Boitumelo F. Makume、Cedric W. Holzapfel、Munaka C. Maumela、J. Alexander Willemse、Jan A. Berg
DOI:10.1002/cplu.202000553
日期:2020.10
The effect of ethylene tetramerisation ligand structures on 1‐octene selectivity is well studied. However, by‐product formation is less understood. In this work, a range of PNP ligand structures are correlated with the full product selectivity and with catalyst activity. As steric bulk on the N‐substituent increases, the product selectivity shifts from >10 % to < 3% of both C6 cyclics and C16+ by‐products
Polyhedral oligomeric silsesquioxane-conjugated bis(diphenylphosphino)amine ligand for chromium(III) catalyzed ethylene trimerization and tetramerization
作者:Hoseong Lee、Soon Hyeok Hong
DOI:10.1016/j.apcata.2018.04.030
日期:2018.6
Polyhedraloligomericsilsesquioxanes (POSSs) were attached to conventional bis(diphenylphosphino)amine (PNP) ligand as solubility-enhancing materials for catalytic ethylene trimerization and tetramerization. Differently functionalized arylphosphine ligands of the type (Ph)2PN(POSS)P(Ph)(ArR) (R = functional groups) were systematically developed, and their corresponding chromium(III) complexes were
将多面体低聚倍半硅氧烷(POSS)连接到常规双(二苯基膦基)胺(PNP)配体上,作为催化乙烯三聚和四聚化的增溶材料。系统地开发了(Ph)2 PN(POSS)P(Ph)(Ar R)(R =官能团)类型的不同功能的芳基膦配体,并形成了它们相应的铬(III)配合物。发达的预催化剂在溶剂中表现出优异的耐受性,甚至包括低碳数烃,例如Ñ戊烷,Ñ己烷,或环己烷。特别地,即使在高于120℃的较高温度下,邻氟苯基取代的配合物也显示出较高的稳定性。在邻-OCF 3-苯基取代的配合物表现出出色的催化活性,在30 bar时达到2287 kg / g Cr / h。
Janus Microspheres for Visual Assessment of Molecular Interconnects
A rigid S‐functionalized metalloligand is used to pair Janus Au‐coated silica microspheres and the resulting assemblies are assessed with optical microscopy. New Pd complexes provide stable molecularinterconnects, and the metal centre controls the structure of the linker and provides the desired rigidity, by virtue of its well‐established coordination chemistry.
Synthesis and crystal structures of novel di- and mononuclear iron complexes chelating by PNP ligands related to [FeFe]-hydrogenases
作者:Xiao-Li Gu、Bo Jin、Pei-Hua Zhao
DOI:10.1080/15421406.2020.1848244
日期:2020.11.1
active sites, two new di- and mononuclear iron complexes with chelating PNP ligands (PNP = (Ph2P)2NR) have been prepared and structurally determined by single-crystal X-ray diffraction analysis. Treatment of precursor Fe2(μ-edt)(CO)6 (A, edt = SCH2CH2S) with diphosphine (Ph2P)2N(CHMe2) in the presence of Me3NO·2H2O in MeCN produced a dinuclear iron complex Fe(μ-edt)(CO)4κ2-(Ph2P)2N(CHMe2)} (1), whereas
Impacts of coordination modes (chelate versus bridge) of PNP-diphosphine ligands on the redox and electrocatalytic properties of diiron oxadithiolate complexes for proton reduction
作者:Pei-Hua Zhao、Meng-Yuan Hu、Jian-Rong Li、Yan-Zhong Wang、Bao-Ping Lu、Hong-Fei Han、Xu-Feng Liu
DOI:10.1016/j.electacta.2020.136615
日期:2020.9
properties of diiron model complexes for proton reduction, the protonation and electrochemistry of 1 and 4 as a pair of representative counterparts are well studied and compared in the absence and presence of strong acid (CF3CO2H) and weak acid (CH3CO2H) as different proton sources by using in situ IR and NMR spectroscopies as well as cyclic voltammetry (CV). For example, the protonationstudies have shown