[Al-3(mu(3)-O)(mu-O2CCF3)(6)(THF)(3)][(Me3Si)(3)CAl( OC(O)CF3)(3)]-C7H8 is the first characterized mu3-oxo-trinuclear basic carboxylate of aluminum closing the gap of isomorphism with the transition metal analogues. The system is an excellent case study for the electronic structure approached by DFT-B3LYP calculations. The actual system proves that the oxo-trinuclear pattern is stabilized by the chemical hardness of oxygen donors and by highly symmetric intramolecular packing of the ligands.