13688-63-6Relevant academic research and scientific papers
An Electron Spin Resonance Study of the Effect of Group IV Substituents in Cyclopentadienyl Radicals
Barker, Philip J.,Davies, Alwyn G.,Henriquez, Roberto,Nedelec, Jean-Yves
, p. 745 - 750 (2007/10/02)
E.s.r. spectra have been recorded in solution for the substituted cyclopentadienyl radicals X3MC5H4, where X3M = Me3Si, Me2HSi, Me2ClSi, Me2FSi, Ph2ClSi, Cl3Si, Me3Ge, Bu3Ge, Ph2ClGe, and Me3Sn.The spectra can be interpreted in terms of perturbation of the orbitals ψA and ψS which are degenerate in the C5H5 radical.This allows the substituents to be placed in the following sequence regarding their electronic interactions, compared with that of hydrogen, with the ψS MO of the cyclopentadienyl ?-system: electron repelling, Me3C >> Bu3Ge Me3Ge > H; electron attracting, H 3Sn 3Si 2HSi 2ClSi 2ClGe 2FSi 2ClSi 3Si.
