Graphical Abstract: A reaction of iron and barium nitrate with ammonium salicylate in the mixture of solvents leads to the formation of the new homotrinuclear complex, [Fe3O(SalH)7(H2O)2]∙(DMAA)2(MeOH)(THF)1,5(H2O)2,6. Single-crystal X-ray study shows that the titled complex with the moiety {Fe3O} belongs to the well-known group of μ3-oxohomotrinuclear carboxylates. The IR and MS studies are in accordance with x-ray data. Thermal behaviour of the complex was studied.