A tris-bidentate complex of AlIII with unusually narrow 27Al nuclear magnetic resonance. Evidence for some distortion of bond direction near aluminium

Abstract

The ²⁷Al n.m.r. resonance of the tris-bidentate complex Al(S₂CNMe₂)₃ is unusually narrow and cannot be accounted for by the crystallographic geometry of its structure. The electron density near aluminium cannot therefore coincide with the crystallographic bond directions. It is also proposed that some bond bending occurs in similar complexes of oxoligands, using the ratio of the linewidths of the octahedral and tetrahedral aluminium atoms in the aluminium isopropoxide tetramer as a measure of relative electric-field gradients.