作者:Taisuke Ono、Keiji Shimoda、Masami Tsubota、Satoshi Hino、Ken-ichi Kojima、Takayuki Ichikawa、Yoshitsugu Kojima
DOI:10.1016/j.jallcom.2010.07.006
日期:2010.9
Metal aluminum amides M[Al(NH2)(4)](x) (M = K, Mg, and Ca; x = 1 and 2) were synthesized along with previously reported LiAl(NH2)(4) and NaAl(NH2)(4) by ball milling technique under liquid NH3. The profiles of synchrotron radiation X-ray diffraction suggest that KAI(NH2)(4), Mg[Al(NH2)(4)](2) and Ca[Al(NH2)(4)](2) have been indexed with single phases, which have never been reported so far. Combination of both FT-IR and Al-27 MAS/3QMAS nuclear magnetic resonance suggest that they all have an anion complex unit [Al(NH2)(4)](-) as a basic component, indicating successful synthesis of the metal aluminum amides. Thermogravimetry-differential thermal analysis coupled with mass spectroscopy showed the release of NH3 below the temperatures of 140 degrees C during the thermal decomposition and a NH3 desorption peak temperature (T-des) decreased with the increasing atomic number. Additionally, a relationship between Al-27 isotropic chemical shift and T-des was discussed. The present study gives an useful information that the thermal stability of the anion complex [Al(NH2)(4)](-) can be controlled by a cation M. (C) 2010 Elsevier B.V. All rights reserved.