| Popis: |
Two complexes Ru 2 (CO) 6 L that arise from thermal reactions of monoazadienes ( E )-CH 3 C(H)C(H)C(H)NR ( 1 ); (R = t−C 4 H 9 , i−C 3 H 7 , c− C 6 H 11 ) with Ru 3 (CO) 12 are reported. The bonding of the six-electron donating organic fragments in the complexes Ru 2 (CO) 6 {σ-N,μ 2 -η 3 -CH 2 CC(H)C(H)NC 4 H 9 −t } ( 4a ) and Ru 2 (CO) 6 {C 2 H 5 CC(H) NC 4 H 9 −t } ( 5a ) is described on the basis of their X-ray single crystal structure determinations. In compound 4a the organic ligand is σ-N,μ 2 -η 3 -coordinated and contains a distorted η 3 -allyl fragment bridging the two Ru(CO) 3 moieties. Compound 5a features a μ 2 -η 3 -azaallyl dianion which bridges the Ru centres in the Ru 2 (CO) 6 core. Possible pathways for the formation of 4a and 5a , involving dehydrogenation and a 1,2-H shift, respectively, are discussed. |
