Concept

Persistent carbene

Publications associées (156)

Organometallic complexes derived from alkyne-functionalized imidazolium salts

Paul Joseph Dyson, Zhaofu Fei, Dongbin Zhao

Two 1,3-dialkyne-functionalized imidazolium chlorides, 1,3-dipropynylimidazolium chloride and 1,3-dipentynylimidazolium chloride, have been prepared from the direct reaction between the appropriate chloroalkyne and (trimethylsilyl)imidazole. Replacement of ...

2004

Group 11 Metal Complexes of N-Heterocyclic Carbene Ligands: Nature of the Metal-Carbene Bond

Xile Hu

The silver, copper and gold complexes of tripodal N-heterocyclic carbene (NHC) ligand, 1,1,1-tris[(3-methylimidazol-1-yl-2-ylidene)methyl]ethane were prepd. and characterized. The silver complex of the title ligand, TIMEMe was prepd. by reaction of [H3TIME ...

2004

Cobalt complexes of nitrogen anchored tripodal N-heterocyclic carbene ligand: Coordination chemistry and reactivity study

Xile Hu

Cationic cobalt(I) tris-carbene complexe [(TIMENxyl)Co]+ (1) is synthesized by reacting Co(PPh3)3Cl with the nitrogen anchored tripodal N-heterocyclic carbene ligand tris[2-(3-xylenylimidazol-2-ylidene)ethyl]amine (TIMENxyl). Compd. 1 displays diverse reac ...

2004

Terminal Cobalt(III) Imido Complexes Supported by Tris(Carbene) Ligands: Imido Insertion into the Cobalt-Carbene Bond

Xile Hu

Highly reactive tris-carbene Co(I) complexes [(TIMENaryl)Co]Cl react with org. azides to yield monomeric Co(III) imido complexes (TIMENaryl)Co(NAr') (aryl = mes, xyl; Ar = -C6H4-CH3, -C6H4-OCH3). The cobalt-imido fragment in these complexes is elec ...

2004

Dioxygen Activation by a Low-Valent Cobalt Complex Employing a Flexible Tripodal N-Heterocyclic Carbene Ligand

Xile Hu

The novel versatile Co(I) tris-carbene complex [(TIMENxyl)Co]Cl (1) (TIMEN = (tris[2-(3-aryl-2,3-dihydro-1H-imidazol-2-ylidene)ethyl]amine)) reacts with CO, 1-electron oxidizers such as CH2Cl2, and O2 to yield the Co complexes [(TIMENxyl)Co(CO)]Cl (2), [(T ...

2004

Dual-functionalised ionic liquids: synthesis and characterisation of imidazolium salts with a nitrile-functionalised anion

Paul Joseph Dyson, Gabor Laurenczy, Zhaofu Fei, Dongbin Zhao

A series of 'dual-functionalised' ionic liquids, comprising imidazolium cations with various functionalities and the nitrile functionalised anion CH3H(BF3)CH2CN have been prepared; some exhibit very low viscosities-a highly valuable property in many a ...

2004

Unusual Ar-H/Rh-H JHH NMR Coupling in Complexes of Rhodium(III): Experimental Evidence and Theoretical Support for an h1-Arene Structure

Ursula Röthlisberger

The synthesis and structural properties of three new hydridorhodium(III) complexes are reported. Hydrogenolysis of the cyclometalated Rh dichloride complexes [RhCl2{(S,S)-benbox(Me2)}] (2a-c; benbox(Me2) = 3,5-dimethyl-2,6-bis[(4-R1-4-R2-4,5-dihydrooxazol- ...

2004

Bronsted acidic ionic liquids and their zwitterions: Synthesis, characterization and pK(a) determination

Paul Joseph Dyson, Zhaofu Fei, Dongbin Zhao

Imidazolium chlorides with one or two carboxylic acid substituent groups, 1-methyl-3-alkylcarboxylic acid imidazolium chloride, [Me{(CH2)(n)COOH}im]Cl (n=l, 3), and 1,3-dialkylcarboxylic acid imidazolium chloride, [{(CH2)(n)COOH}(2)im]Cl (n=1, 3), have bee ...

2004

Molecular structure, vibrational spectra, and hydrogen bonding of the ionic liquid 1-ethyl-3methyl-1H-imidazolium tetrafluoroborate

Paul Joseph Dyson, Ana Vidis

The IR and Raman spectra and conformations of the ionic liquid 1-ethyl-3-methyl-1H-imidazolium tetrafluoroborate, [EMIM][BF4] (6), were analyzed within the framework of scaled quantum mechanics (SQM). It was shown that SQM successfully reproduced the spect ...

2004

A Bis-Carbenealkenyl Copper(I) Complex from a Tripodal Tris-Carbene Ligand

Xile Hu

The new tris-carbene ligand [TIMEt-Bu] has been synthesized and fully characterized. Reaction of the free carbene with copper(I) salt provided an unprecedented dinuclear Cu(I)-Cu(I) complex, in which the cuprous ion is coordinated in a trigonal planar liga ...

2003

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