Crystal and molecular structures of diaqua(nitrilotriacetato)aluminium(III) and di-µ-hydroxo-bis(nitrilotriacetato)dialuminate(III) dianion
Abstract
The crystal structures of [Al(nta)(H2O)2]·(CH3)2CO·H2O (1) and [Al(H2O)2][Al2(nta)2(µ-OH)2]-OH·3H2O (2)(nta = nitrilotriacetate) were determined by X-ray crystallography and refined to R= 0.043 [(1)] and 0.045 [(2)]. In both cases the ligating behaviour of nta3– is uncomplicated, i.e. quadridentate and non-bridging, and the geometry around AlIII is distorted octahedral, owing to the geometric requirements of the nta3– ligand. Compound (2) contains dimeric groups in which two Al–nta moieties are joined by two OH bridges; the Al ⋯ Al distance is equal to 2.842(2)Å. Both crystal lattices are stabilized by significant intermolecular hydrogen bonds.