METHOD FOR PREPARING AN AMMINE METAL BOROHYDRIDE

摘要

Method for preparing an ammine metal borohydride of formula:         AxM(BH4)x+m(NH3)nwherein:A is an alkali metal,M is a metal different from an alkali metal,0 ≤ x ≤ 2,n > 0, andm > 0,the method comprising- a nucleophilic addition reaction, implemented in liquid ammonia NH3, of a metal hydride of formula AxMHx+m and a borane complex of formula L•BH3, L being a solvent forming a complex with a borane compound BH3, such as to obtain a metal borohydride complex of formula AxM(BH4)x+mLn, and- a displacement reaction between the metal borohydride complex and liquid ammonia to obtain the ammine metal borohydride.