Mercurycyclopentadienyl derivatives aer not always fluxional

Cyclopentadienyl derivatives of mercury have been proven to behave in a nonfluxional manner through three observation results. These findings show that the 13C{1H} CP MAS MAS, particularly for the eta1 bound C atoms, shifts are very similar to those in solution. Moreover, none of the chemical shifts for 1H, 13C{1H} and 29Si{1H} solution state were highly temperature dependent. Also, the nJ(13C-199Hg) couplings constantly stayed within the range +30 to -38 degree centigrades. The results show that a single Si substitutent for mercury cyclopentadienyl derivatives allows a suitable electronically unique shite within the cyclopentadienyl ligand.