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Six-membered-ring N-heterocyclic carbenes having only one N atom (NHC 1N-R6 carbenes) can be easily prepared by simple deprotonation of readily available N-methylpyridinium-type cations with K[N(SiMe 3) 2]. They have been trapped in solution with [Ru 3(CO) 12] to give novel triruthenium clusters that contain orthometalated NHC 1N-R6 carbene ligands in a face-capping coordination mode. Four NHC 1N-R6-derived compounds of general formula [Ru 3(μ-H)(μ 3-κ 2 C 2, C 3-L)(CO) 9] (L = N-methylpyrid-3-yl-2-ylidene ( 1; from N-methylpyridinium), N-methyl-6-picolin-3-yl-2-ylidene ( 2; from N-methyl-2-picolinium), N-methyl-4-picolin-3-yl-2-ylidene ( 3; from N-methyl-4-picolinium), and N-methylquinolin-3-yl-2-ylidene ( 4; from N-methylquinolinium)) have been isolated and characterized. The mechanism of the reaction that leads to compound 1 from N-methylpyrid-2-ylidene and [Ru 3(CO) 12], as a case study, has been modeled using DFT calculations.
The high basicity of the NHC 1N-R6 carbenes, the close proximity of a carbene ligand ortho-C−H bond to a cluster metal atom, and the irreversibility of the CO elimination steps trigger the orthometalation of the NHC 1N-R6 carbenes and the subsequent face-capping coordination of the metalated ligands. Corel Cocut Pro X4 Full With Licence Key Avast. The N-methyl-4-picolinium salts of two polynuclear carbonyl dianions, the previously known [Ru 6(μ 3-CO) 2(μ-CO) 2(CO) 14] 2− ( 5 2−) and the novel [Ru 5(μ 4-O)(μ-CO) 2(μ 3-CO) 2(CO) 10] 2− ( 6 2−), have also been isolated from [Ru 3(CO) 12] and N-methyl-4-picolin-2-ylidene in the presence of adventitious moisture. The pentanuclear dianion 6 2− contains a μ 4-oxo ligand in a hitherto unknown square face-capping coordination mode. Learn more about these metrics Article Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days. The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online.
We give some details for the reader's convenience. Let M( ) denote the set of all nonzero, multiplicative, continuous linear forms:. Each ∈ M( ) satisfies that ‖ ‖ = 1, and furthermore is positive, that is, ( ) ≥ 0 whenever ≥0. Since is multiplicative and nonzero.
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