Abstract
Treatment of [(PPh 3) 2N][Ru 6C(Co) 15(C 3H 5)] in hot methanol gave crystals in the triclinic space group P 1 ( 2), which is a solid-state isomer of the same compound as previously obtained from CH 2Cl 2-methanol at −20°C in the monoclinic space group P2 1/ a ( 1). In solutions, 1 and 2 have the same IR and variable-temperature 1H and 13C NMR spectra. In the solid state, the carbonyl stereochemistries are different: 1 possesses one bridging and one semi-bridging carbonyl ligand, while 2 has a single bridging carbonyl ligand. Taking the carbonyl bridge as standard, the μ, η 3-allyl group occupies the same edge of the Ru-octahedron in both isomers, but its position in 2 is shifted significantly from that of 1, so that the three carbon atoms of the allyl group are on the same side of the equatorial plane which contains that edge.
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