文摘
The equilibrium structures of 1,4,7,10-tetraazatetracyclo[5.5.1.04,13.010,13]tridecane and tetrakis(dimethylamino)methane were calculated at the HF/6-31G** ab initio level of theory and found to show a spiro-connection of two U- and W-shaped arrangements of the nitrogen lone pairs with D2 and D2d symmetry, respectively. The NMR 1H and 13C chemical shifts have been analyzed with ab initio continuous set of gauge transformations (CSGT) calculations performed with the B3LYP/6-311+G(2d,p) hybrid functional model. The He(I) photoelectron spectra were measured and interpreted by means of ab initio outer valence Green function (OVGF) calculations, which give an overall consistent reproduction of the energies and splittings of the n(N) bands.