80027-50-5Relevant academic research and scientific papers
Beitraege zur Chemie des Bors, 119. Darstellung und Struktur von Trisaminen
Noeth, Heinrich,Staudigl, Rudolf,Storch, Wolfgang
, p. 3024 - 3043 (2007/10/02)
NMR data of trisamines, N3, prepared by two different routes, indicate chemically equivalent RS groups in solution.The rather weak screening at boron and nitrogen agrees with the competition of three boron atoms for the lone pair of electrons at nitrogen, e.g. weak BN-?-bonding. - The equivalence of the RS groups is lost in the solid state.One (RS)2B group in each of the compounds 1 - 4 is strongly twisted against the B3N plane, and following the series 1, 2, 4 and 3 the other two orient themselves more and more coplanarily to this plane.Accordingly, a relatively long BN bond (147 - 148 pm) is observed besides two shorter BN bonds (143 - 145 pm) in each of these compounds.This is experimental evidence for the dependence of the B - N distance from ?-bond order and its angular dependence.In addition, the structures of the 1,3,2-dithiaborolan, the 1,3,2-benzodithiaborol, and the 1,3,2-dithiaborolene ring systems have been ascertained.Only the latter two posses planar rings. - Mass spectrometric fragmentation of the trisamines proceeds with preferential retention of BN bonding.For instance, the molecular ion of 2 breaks apart by three successive eliminations of ethylene with formation of the radical cation of NB3S6+ (12), derived from a hitherto unknown tricyclic system.
