Aromaticity of an Unsaturated N-Heterocyclic Stannylene (HCRN)2SnIIAs Studied by Optical Spectra and Quantum Chemistry. Comparison in the Series (HCRN)2EII, E = C, Si, Ge, Sn (R =t-Bu or Dip)статья
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Аннотация:The degree of π-electron delocalization in a series of unsaturated N-heterocyclic compounds containing divalent group-14 atoms, (HCRN)2EII (E = C, Si, Ge, Sn), has been estimated by applying different experimental and theoretical criteria (vibrational and UV−vis spectroscopy, nucleus-independent chemical shifts, and isomerization stabilization energies). All of the methods used confirmed the aromaticity of these heterocyclic molecules involving six π electrons, and most of the methods indicated that the aromaticity increases in going from the silylene to the stannylene.