Abstract
Thermolysis of [Ru3(CO)9(μ3-NOMe)(μ3-η2PhC2Ph)] (1) with two equivalents of [Cp*Co(CO)2] in THF afforded four new clusters, brown [Ru5-(CO)8(μ-CO)3(η5-C5Me5)(μ5-N)(μ4-η2-Ph-C2Ph)] (2), green [Ru3Co2(CO)7(μ3-CO)(η5-C5Me5)2(μ3-NH){μ4-η8-C6H4-C(H)C(Ph)}] (3), orange [Ru3(CO)7(μ-η6-C5Me4CH2){μ-η3-PhC2(Ph)C(O)N-(OMe)}] (4) and pale yellow [Ru2-(CO)6{μ-η3-PhC2(Ph)C(O)N(OMe)}] (5). Cluster 2 is a pentaruthenium μ5-nitrido complex, in which the five metal atoms are arranged in a novel "spiked" square-planar metal skeleton with a quadruply bridging alkyne ligand. The μ5-nitrido N atom exhibits an unusually low frequency chemical shift in its15N NMR spectrum. Cluster 3 contains a triangular Ru2Co-imido moiety linked to a ruthenium - cobaltocene through the μ4-η8-C6H4C(H)C(Ph) ligand. Clusters 4 and 5 are both metallapyrrolidone complexes, in which interaction of diphenylacetylene with CO and the NOMe nitrene moiety were observed. In 4, one methyl group of the Cp* ring is activated and interacts with a ruthenium atom. The "distorted" Ru3Co butterfly nitrido complex [Ru3Co(CO)5(η5-C5Me5)(μ4-N)(μ3-η2-PhC2Ph)(μ-I)2I] (6) was isolated from the reaction of 1 with [Cp*Co(CO)I2] heated under reflux in THF, in which a Ru-Ru wing edge is missing. Two bridging and one terminal iodides were found to be placed along the two Ru-Ru wing edges and at a hinge Ru atom, respectively. The redox properties of the selected compounds in this study were investigated by using cyclic voltammetry and controlled potential coulometry.15N magnetic resonance spectroscopy studies were also performed on these clusters.
Original language | English |
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Pages (from-to) | 258-271 |
Number of pages | 14 |
Journal | Chemistry - A European Journal |
Volume | 7 |
Issue number | 1 |
DOIs | |
Publication status | Published - 5 Jan 2001 |
Externally published | Yes |
Keywords
- Cluster compounds
- Cobalt
- N ligands
- Nmr spectroscopy
- Ruthenium
ASJC Scopus subject areas
- General Chemistry