Abstract
Lone pair ionization energies for 1,5-dichalcogenocanes containing endocyclic 3,7-R2Si groups and the parent 1,5-dichalcogenocanes, estimated from the TCNE charge-transfer wavelength maxima, are in good agreement with ionization energies directly obtained from photoelectron spectroscopy. These data indicate the occurrence of substantial intra-annular interaction between the chalcogen atoms and silyl groups, consistent with the well-known β -effect of silicon and the novel β-disilyl effect, when R (in R 2 Si) is Me 3 Si.
Acknowledgments
The authors gratefully acknowledge support of this work by the donors of the Petroleum Research Fund administered by the American Chemical Society (EB, RSG), the National Science Foundation (CHE-9906566, CHE-0342660, CHE-0450505, CHE-0744578, EB; CHE-0201555, CHE-0455575, RSG), and NCS through a super-computing grant (EL). This work was done, in part, at the Center for Gas-Phase Electron Spectroscopy, The University of Arizona.
Notes
a Solvent is CH2Cl2
b reacts with TCNE.