AlH3(NR3)2 - Alane bis(amine)
Al has 3 valence electrons plus 1 for each Al-H and 2 for each Al-N dative bond
Total = 10 electrons, five pairs
Structure trigonal bipyramid, class AX5
Point group D3h
In accord with Bent's rule, the more electronegative substituent (NR3)