Variable-temperature one- and two-dimensional C-13 CP/MAS NMR studies of the dynamics of monohaptocyclopentadienyl rings of hafnium and titanium tetracyclopentadienyl in the solid state
EJ Munson, MC Douskey, SM De Paul, M Ziegeweid, L Phillips, F Separovic, MS Davies, MJ Aroney
Journal of Organometallic Chemistry | ELSEVIER SCIENCE SA | Published : 1999
Organometallic compounds with cyclopentadienyl ligands (C5H5) can undergo fluxional motion. We have studied the Group IVB transition metal complexes of the formula M(η5-C5H5)2(η 1-C5H5)2, where M = Ti and Hf, in the solid state using variable-temperature 13C CP/MAS NMR spectroscopy. We present data which indicate that intramolecular rearrangement proceeds via a sigmatropic shift. Using two-dimensional (2D) exchange NMR, we can follow the rearrangement of the single bonded cyclopentadienyl ligands. © 1999 Elsevier Science S.A. All rights reserved.