scholarly journals Synthesis of bis-(benzocyclohexan-ketoimino) Ni(ii) with different electron groups and their catalytic copolymerization of norbornene and polar norbornene

RSC Advances ◽  
2017 ◽  
Vol 7 (77) ◽  
pp. 48745-48753 ◽  
Author(s):  
Xiaohui He ◽  
Yingping Yang ◽  
Suli Wang ◽  
Zhilong Han ◽  
Guangshui Tu ◽  
...  
Keyword(s):  
Nickel Complexes ◽  
Bidentate Ligand ◽  
Catalytic Copolymerization

Several N,O-chelating type bidentate ligand nickel complexes were synthesized, characterized and applied to catalyze copolymerization of norbornene and polar norbornene.

scholarly journals A stable (amino)(phosphino)carbene as bidentate ligand for palladium and nickel complexes: Synthesis, structure, and catalytic activity

2005 ◽  
Vol 690 (24-25) ◽  
pp. 5541-5545 ◽  
Author(s):  
Emmanuelle Teuma ◽  
Céline Lyon-Saunier ◽  
Heinz Gornitzka ◽  
Gérard Mignani ◽  
Antoine Baceiredo ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Nickel Complexes ◽  
Bidentate Ligand

A Stable (Amino)(phosphino)carbene as Bidentate Ligand for Palladium and Nickel Complexes: Synthesis, Structure, and Catalytic Activity.

ChemInform ◽  
2006 ◽  
Vol 37 (29) ◽  
Author(s):  
Emmanuelle Teuma ◽  
Celine Lyon-Saunier ◽  
Heinz Gornitzka ◽  
Gerard Mignani ◽  
Antoine Baceiredo ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Nickel Complexes ◽  
Bidentate Ligand

Coordination chemistry of a mixed donor bidentate ligand with nickel. A tetrameric enolate of sodium that binds a phosphine donor

1995 ◽  
Vol 73 (7) ◽  
pp. 1175-1180 ◽  
Author(s):  
Michael D. Fryzuk ◽  
Xiaoliang Gao ◽  
Steven J. Rettig
Keyword(s):  
Coordination Chemistry ◽  
Nickel Complexes ◽  
Bidentate Ligand ◽  
Homogeneous Catalyst ◽  
Phosphonium Salts ◽  
Donor Ligand ◽  
Full Matrix ◽  
Space Group ◽  
Tetrameric Structure ◽  
Catalytic Behaviour

The preparation of a mixed donor ligand consisting of an enolate and neutral phosphine is described and its coordination chemistry with nickel reported. The phosphino ketones R2PCH2COPh (R = Cy or Pri) are prepared by the reaction of the corresponding secondary phosphines with bromoacetophenone to form the corresponding phosphonium salts [R2P(H)CH2COPh]+Br− (R = Cy or Pri); subsequent deprotonation leads to the neutral ketones. The enolates are formed by addition of NaN(SiMe3)2 to the neutral ketone. The crystal structure of the sodium enolate having isopropyl substituents at phosphorus displays a tetrameric structure in the solid state and there is an interaction of the phosphorus donor with the sodium anion: Na—P, 2.852(2) Å. The preparation of a series of nickel complexes was achieved by addition of the sodium enolate to the appropriate Ni(II) starting material. The structures of the nickel derivatives are reported. The catalytic behaviour of one of these complexes in the polymerization and oligomerization of ethylene is briefly described. Crystals of {Na[Pri2PC(H)=C(O)Ph]}4, 2b, are tetragonal, a = b = 20.790(2) Å, c = 13.539(7) Å, Z = 4, space group I41/a1; those of [Cy2PC(H)=C(O)Ph](PPh3)NiPh, 3a, are triclinic, a = 10.742(2) Å, b = 19.811(3) Å, c = 10.621(2) Å, α = 101.88(1)°, β = 119.24(1)°, γ = 91.08(1)°, Z = 2, space group [Formula: see text] and those of [Pri2PC(H)=C(O)Ph](PPh3)NiPh, 3b, are triclinic, a = 10.219(1) Å, b = 17.432(3) Å, c = 9.788(1) Å, α = 101.18(1)°, β = 100.19(1)°, γ = 85.32(1)°, Z = 2, space group [Formula: see text] The structures were solved by direct (2b) and Patterson (3a and 3b) methods and were refined by full-matrix least-squares procedures to R = 0.045, 0.044, and 0.032 (Rw = 0.038, 0.041, and 0.030) for 965, 4483, and 5085 reflections with I > 3σ(I) respectively. Keywords: nickel, sodium enolate, homogeneous catalyst, oligomerization.

Catalytic Copolymerization of Ethene and Carbon Monoxide on Nickel Complexes

1998 ◽  
Vol 37 (21) ◽  
pp. 3050-3052 ◽  
Author(s):  
Bernd Domhöver ◽  
Wolfgang Kläui ◽  
Andreas Kremer-Aach ◽  
Ralf Bell ◽  
Dietrich Mootz
Keyword(s):  
Carbon Monoxide ◽  
Nickel Complexes ◽  
Catalytic Copolymerization

Transition metal complexes of dithioacetylacetone and diselenoacetylacetone: syntheses, properties, and infrared spectra

1969 ◽  
Vol 22 (5) ◽  
pp. 891 ◽  
Author(s):  
CG Barraclough ◽  
RL Martin ◽  
IM Stewart
Keyword(s):  
Transition Metal Complexes ◽  
Nickel Complexes ◽  
Bidentate Ligand ◽  
Mixed Complex ◽  
Normal Coordinate ◽  
Experimental Conditions ◽  
Divalent Nickel ◽  
Related Series ◽  
Infrared Absorption Spectra ◽  
Cobalt And Nickel

The synthesis and properties of some cobalt(II) and nickel(II) complexes of dithioacetylacetone and diselenoacetylacetone are described. Unlike the corresponding acetylacetonates, the cobalt and nickel complexes are square-coordinated monomers with ground states of spin S = 1/2 and S = 0, respectively. For divalent nickel, the isolation of a mixed complex containing one monothioacetylacetonate and one dithioacetylacetonate bidentate ligand completes the NiS2O2, NiS3O, NiS4 series of diamagnetic monomers. � A tentative mechanism is proposed for the course of the reaction which leads to these compounds under the experimental conditions first formulated by Martin and Stewart. The infrared absorption spectra have been assigned on the basis of a normal coordinate analysis taken in conjunction with the unusually favourable circumstances offered by a closely related series of square-coordinated monomers [Cu(acac)2], [Co(SacSac)2], [Ni(SeacSeac)2].

Synthesis and Photochemical Properties of Re(I) Tricarbonyl Complexes Bound to Thione and Thiazole-2-ylidene Ligands

2020 ◽  
Author(s):  
Matthew Stout ◽  
Brian Skelton ◽  
Alexandre N. Sobolev ◽  
Paolo Raiteri ◽  
Massimiliano Massi ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Ligand Exchange ◽  
Ligand Substitution ◽  
Bidentate Ligand ◽  
The Other ◽  
Ligand Exchange Reaction ◽  
Multiple Products ◽  
Ligand Charge Transfer ◽  
Photochemical Properties

<p>Three Re(I) tricarbonyl complexes, with general formulation Re(N^L)(CO)<sub>3</sub>X (where N^L is a bidentate ligand containing a pyridine functionalized in the position 2 with a thione or a thiazol-2-ylidene group and X is either chloro or bromo) were synthesized and their reactivity explored in terms of solvent-dependent ligand substitution, both in the ground and excited states. When dissolved in acetonitrile, the complexes bound to the thione ligand underwent ligand exchange with the solvent resulting in the formation of Re(NCMe)<sub>2</sub>(CO)<sub>3</sub>X. The exchange was found to be reversible, and the starting complex was reformed upon removal of the solvent. On the other hand, the complexes appeared inert in dichloromethane or acetone. Conversely, the complex bound to the thiazole-2-ylidene ligand did not display any ligand exchange reaction in the dark, but underwent photoactivated ligand substitution when excited to its lowest metal-to-ligand charge transfer manifold. Photolysis of this complex in acetonitrile generated multiple products, including Re(I) tricarbonyl and dicarbonyl solvato-complexes as well as free thiazole-2-ylidene ligand.</p>

Spatiotemporal Control of Amide Radicals During Photocatalysis

2020 ◽  
Author(s):  
Shogo Mori ◽  
Takahiro Aoki ◽  
Kaliyamoorthy Selvam ◽  
Shunichi Fukuzumi ◽  
Jieun Jung ◽  
...  
Keyword(s):  
Organic Synthesis ◽  
Nickel Complex ◽  
Nickel Complexes ◽  
Semiconductor Material ◽  
Radical Reactions ◽  
Substitution Reactions ◽  
Carbon Neutrality ◽  
Spatiotemporal Control ◽  
Scalable Production ◽  
Salt Waste

Despite the continuing popularity of radical reactions in organic synthesis, much remains to be explored in this area. Herein, we describe how spatiotemporal control can be exerted over the formation and reactivity of divergent exchangeable formamide radicals using nickel complexes with a semiconductor material (TiO<sub>2</sub>) under irradiation from near-UV–Vis light. Depending on the bipyridine ligand used and the quantity of the nickel complex that is hybridized on or nonhydridized over the TiO<sub>2</sub> surface, these radicals selectively undergo substitution reactions at the carbon center of carbon–bromine bonds that proceed via three different pathways. As the scalable production of formamides from CO<sub>2</sub> does not produce salt waste, these methods could add a new dimension to the search for carbon neutrality through the indirect incorporation of CO<sub>2</sub> into organic frameworks.

A Solvent-Dependent and Electrochemically Controlled Self-Assembling/Disassembling System

2003 ◽  
Vol 68 (9) ◽  
pp. 1647-1662 ◽  
Author(s):  
Valeria Amendola ◽  
Massimo Boiocchi ◽  
Yuri Diaz Fernandez ◽  
Carlo Mangano ◽  
Piersandro Pallavicini
Keyword(s):  
Equilibrium Mixture ◽  
Bidentate Ligand ◽  
Molecular Structures ◽  
The Self ◽  
Molar Ratio ◽  
Crystal And Molecular Structures ◽  
Self Assembling ◽  
Irreversible Oxidation ◽  
Irreversible Reduction ◽  
Metal Ligand

The bis-bidentate ligand R,S-1,2-diphenyl-N,N'-bis(2-quinolinemethylidene)ethane-1,2-diamine (ligand 4), containing two (iminomethyl)quinoline moieties separated by a cis-1,2-diphenylethylene spacer, forms stable complexes with both CuI and CuII. With CuII, the monomeric 1:1 complex [CuII(4)]2+ is obtained both in CH3CN and CH2Cl2. With CuI and overall 1:1 metal/ligand molar ratio, an equilibrium mixture is obtained in CH3CN, consisting of [CuI(4)2]+, [CuI2(4)2]2+ and [CuI2(4)(CH3CN)4]2+. The preponderant species is the two-metal one-ligand "open" complex [CuI2(4)(CH3CN)4]2+, in which each Cu+ cation is coordinated in a tetrahedral fashion by one (iminomethyl)quinoline unit and by two CH3CN molecules. Precipitation from the equilibrium mixture yields only crystals of [CuI2(4)(CH3CN)4](ClO4)2·2CH3CN, whose crystal and molecular structures have been determined. On the other hand, in the poorly coordinating CH2Cl2 solvent, only the dimeric helical [CuI2(4)2]2+ complex is obtained, when the overall metal/ligand 1:1 molar ratio is chosen. Addition of large quantities of acetonitrile to solutions of [CuI2(4)2]2+ in dichlorometane results in the formation of [CuI2(4)(CH3CN)4]2+, i.e. in the solvent-driven disassembling of the CuI helicate. While electrochemistry in CH3CN is poorly defined due to the presence of more than one CuI species, cyclic voltammetry experiments carried out in CH2Cl2 revealed a well defined behavior, with irreversible oxidation of [CuI2(4)2]2+ and irreversible reduction of [CuII(4)]2+ taking place at separate potentials (∆E ≈ 700 mV). Irreversibility and separation of the redox events are due to the self-assembling and disassembling processes following the reduction and oxidation, respectively.

Synthesis of unsaturated amines from butadiene and allylamines in presence of palladium and nickel complexes

1978 ◽  
Vol 27 (6) ◽  
pp. 1230-1232 ◽  
Author(s):  
U. M. Dzhemilev ◽  
F. A. Selimov ◽  
A. Z. Yakupova ◽  
G. A. Tolstikov
Keyword(s):  
Nickel Complexes
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