摘要
XPS studies on the structure of three important members of heteronitro-tricyclic compounds have been reported by the present authors before. Experimental results have confirmed the existence of N→B, N→Si and N→Ti dative bonds in these compounds respectively. And the affection of different substituents and carbonyl groups in the molecular ring for these dative bonds has also been investigated and the EHMO (extended Huckel Molecular Orbital) theoretical calculation for silatrane
