pπ— d π conjugation effects have been estimated by measuring the long range fluorine—proton coupling constants in organometallic Group IV derivatives of fluoro- and pentafluoro-benzene.doi:10.1016/S0022-328X(00)88120-6J.-P. Bremond
The values obtained for σ(SiMe 3) have evidenced large transannular effects and pπ-dπ contribution to the carbon-silicon bond when Z is a strong electron donor.doi:10.1016/S0022-328X(00)86048-9J.M. AngelelliJ.C. MaireY VIGNOLLET...
Correlations which are valid for non-organometallic C 6F 5Y compounds do not apply, thus revealing the particular nature of the C 6F 5 M bond.doi:10.1016/S0022-328X(00)92741-4J.C. MaireY. LimouzinElsevier B.V.Journal of Organometallic Chemistry...
The variation of the benzenoid bands in the series clearly indicates that p π d π effect is important when X is an electron releasing group.doi:10.1016/S0022-328X(00)88954-8Y LimouzinElsevier B.V.Journal of Organometallic Chemistry