叠氮二异丁基铝的构造及其缔合-解离平衡研究

Studies of Construction and Equilib rium of Association-dissociation for Diisobutylaluminum Azide

叠氮二异丁基铝DBAA是一个新合成的化合物。通过相对分子质量的测定、氢核磁共振谱和铝核磁共振谱的测定确定了DBAA三聚体的分子构造在溶液中研究了DBAA的三聚体和单量体之间的缔合解离平衡。这个平衡受溶剂性质、温度的影响。借助铝核磁共振谱和相对分子质量的测定计算了DBAA三聚体的解离平衡常数、解离焓和解离熵等热力学数据。

The organoaluminum azide compounds are widely used. These compounds are azidating agents, and these are the materials from which the namometer AIN are prepared and are also the energetic materials for which are always used in national defense industry and in space technology. The diisobutyl aluminum azide (DBAA) as an new compound have been prepared recently, and has not been reported in the literature yet. The molecular weight of DBAA are determined with cryoscopic method. The H-1 NMR spectra are also determined at different temperatures. The molecular construction of (1), the trimmer of DBAA, is decided that is a hexatomic ring of Al and N according to the above-mentioned determinations. For the equilibrium of association-diassociation i.e., trimmermonomer) of DBAA in benzene or toluene has been established by cryoscopic molecular-weight determination and H-1 NMR spectrum recorded at different temperatures: (DBAA)(3) reversible arrow 3DBAA The thermodynamic data( K-d, DeltaH(d) and DeltaS(d)) of the (DBAA) 3 dissociation have been calculated from these observed values of Al-27 NMR at different temperatures and molecular-weight determination. These data from different methods are consistent.