F. Ogliaro et al., A DFT investigation of the molecular and electronic structures of 19-electron transition-metal sandwich complexes, NEW J CHEM, 24(5), 2000, pp. 257-259
DFT calculations indicate that the 19-electron transition-metal complexes [
M(C5R5)(C6R6')] (R, R' = H, Me) have a metal-centered SOMO, a rather flexib
le molecular structure and that in their ground state the arene ring does n
ot always adopt a perfect eta(6) coordination mode.