Tetra-kis(quinolin-8-olato-κN,O)hafnium(IV) toluene disolvate.

In the title compound, [Hf(C(9)H(6)NO)(4)]·2C(7)H(8), the hafnium metal centre is coordinated by four N,O-donating bidentate quinolin-8-olate ligands arranged to give a square-anti-prismatic coordination polyhedron with a slightly distorted dodeca-hedral geometry. The average Hf-O and Hf-N distances are 2.096†(3) and 2.398†(3)†à , respectively, and the average O-Hf-N bite angle is 70.99†(11)°. The crystal packing is controlled by π-π inter-actions between quinoline ligands of neighbouring mol-ecules and hydrogen-bonding inter-actions. The inter-planar distances vary between 3.138†(1) and 3.208†(2)†à , while the centroid-centroid distances range from 3.576†(1) to 4.074†(1)†à .