Core Excitation Spectroscopy of Stable Cyclic Diamino Carbenes, Silylenes and Germylenes
John F. Lehmanna , Stephen G. Urquhartb , Laura
Ennisa , Adam P. Hitchcocka++ , Ken Hatanoc
Shilpi Guptac and Michael K. Denk c
a. Department of Chemistry, McMaster University, Hamilton, ON, Canada,
b. Department of Physics, North Carolina State University, Raleigh, NC, USA, 27696-7518
c. Department of Chemistry, University of Toronto, Mississauga, ON, Canada, L5L 1C6
Inner shell electron energy loss spectra, supported by ab initio calculations, are used to explore the origin and relative stability of a series of cyclic, saturated and unsaturated divalent diaminocarbenes, diaminosilylenes and diaminogermylenes. The dominant stabilization comes from delocalization over the N-E(II)-N fragment in all three species, combined with steric stabilization by t-butyl substituents.