Abstract
The proton NMR spectra of Si-substituted silatranes, a new class of biologically active compounds, measured in the presence of Co 2+, Ni 2+ and Eu 3+ ions are examined. These silatranes coordinate with Co 2+ and Ni 2+ through a nitrogen atom and with Eu 3+ through an oxygen atom mainly without transition to the exo-form. The electronic structure of nitrogen in silatranes is the same as that of pyrrol nitrogen. This suggests that in silatranes a nitrogen lone pair and oxygen lone pairs form common electron system analogous, for example, to the π-system of unsaturated cycles.
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