“…In a paper from 1960 describing the synthesis and chemical properties of (Me 2 N) 3 PBH 3 its high stability even to steam is attributed to stabilisation of the B-H bonds by interaction with empty d orbitals at phosphorus. 13 If such an interaction took place, one should expect a compressed P-B-H angle, and indeed the in plane P-B-H angle is only 100.9Њ (the other two 109.1) according to the calculations (note that the crystal structure values are different, but their significance can be doubted). This value is similar to those of H 3 P-BH 3 [103.6(2)Њ] and MeH 2 P-BH 3 [102.9(6) and 104.2(10)Њ].…”