1-silatranes and their complexes with CuCl2

Article abstract of DOI:10.1016/0022-328X(89)85309-4

1-silatranes, NH2(CH2)2NH(CH2)n-Si(OCH2CH2)3N- (I, n=1; III, n=3) and their paramagnetic complexes with CuCl2 (2:1) (III and IV) have been synthesized.Relevant 1H and 13C NMR data reveal, that the molecule I in the series of silatranes has the weakest transannular Si<-N bond.The pattern of the signals and the value of the g-factor in the ESR spectra of complexes III and IV in the crystalline state and in MeOH or DMSO solution points to distortion of the chelate planes and to conformational inhomogeneity.The fragmentation of complexes III and IV in Xe⁰ fast atom bombardment (FAB) mass spectra indicates that the Si<-N bond in their molecules is stronger than those in the initial silatranes I and II.