674316-56-4Relevant academic research and scientific papers
Triruthenium, hexaruthenium, and triosmium carbonyl derivatives of 2-amino-6-phenylpyridine
Cabeza, Javier A.,Del Rio, Ignacio,Riera, Victor,Suarez, Marta,Garcia-Granda, Santiago
, p. 1107 - 1115 (2004)
The triruthenium cluster complexes [Ru3(μ-H) (μ3-η2-HapyPh-N,N)(CO)9 ] (1) and [Ru3(μ-H)2(μ3-η3- HapyC6H4-N,N,C)2(CO)6] (2) and the hexaruthenium ones [Ru6(μ3-H)2 (μ5-η2-apyPh-N,N)(μ-CO)2 (CO)14] (3) and [Ru6(μ3-H) (μ5-η3-apyC 6H4-N,N,C) (μ-CO)3 (CO)13] (4) have been prepared from [Ru3(CO)12] and 2-amino-6-phenylpyridine (H2apyPh). Compound 1 contains a deprotonated HapyPh ligand capping a face of the metal triangle. Compound 2 contains two cyclometalated HapyC6H4 ligands, each spanning a Ru-Ru edge through the N atom of the amido fragment and chelating the remaining Ru atom through both the pyridine N atom and the C atom of the cyclometalated ring. The hexanuclear derivatives 3 and 4 have an uncommon basal edge-bridged square pyramidal metallic skeleton. The bridging ligand of 3 is a doubly deprotonated apyPh ligand which caps the metallic square through the exocyclic N atom, while is attached to the Ru atom that bridges the edge of the square pyramid through the pyridine N atom. Complex 4 is structurally related to 3 but has a cyclometalated phenyl ring. It has been established that compound 2 is formed by reaction of 1 with H2apyPh and that complex 3 is formed by reaction of 1 with [Ru3(CO)12]. While the hydrogenation of 4 gives 3, the thermolysis of 3 gives 4 among other unidentified products. The reaction of the osmium cluster [Os3(CO)10 (MeCN)2] with H2apyPh gives a 1:5 mixture of the edge-bridged decacarbonyl derivatives [Os3(μ-H)(μ- η1-HapyPh-N)(CO)10] (5) and [Os3(μ-H) (μ-η2-HapyPh-N,N)(CO)10] (6). Both compounds give the face-capped nonacarbonyl derivative [Os3(μ-H)- (μ3-η2-HapyPh-N,N) (CO)9] (7) upon irradiation with UV light. Curiously, while complexes 5 and 7 are stable in refluxing toluene, the thermolysis of 6 gives a mixture of 5, 7, and the cyclometalated dihydride [Os3(μ-H)2(μ- η3-HapyC6H4-N,N,C)(CO)9] (8).
