Hexaammine complexes synthesis

The H3NAIX3 molecules have been studied in the gas phase by IR/Raman spectroscopy.24 NCA yields Al—N force constants of 1.50N cm-1 (X = C1) and 1.45 N cm-1 (X = Br). The analyses of spectra were supported by ab initio MO calculations which were also extended to H3NAIF3, a molecule which has eluded synthesis. The ammonia adduct of alane (A1H3) is unknown. A hexaammine A1(BH4)3-6NH3 is the product of excess ammonia on KA1(BH4)4.25 It is believed to contain the cation A1(NH3)1+ and it is possible that this species is also present in some of the complexes A1X3(NH3) , noted above, but structural investigation is required. 

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