The crystal structure of a binuclear copper(II) complex, μ-formato-1kO:2kO'-μ-2,2'-[1,3-(2-hydroxypropanediyl-1:2k 2 O)bis(nitrilomethylidyne)]diphenolato(3-)-1k 3 N,O:2k 2 N',O'-dicopper(II), [Cu 2 (L-sal)(HCOO)], H 3 (L-sal)=N,N'-bis(salicylidene)1,3-diamino-2-propanol, was determined by X-ray diffraction. The title compound is ferromagnetic as a result of the roof-shaped structure of the Cu 2 O(OCO) core (-2J=-94 cm -1 ). The Cu...Cu distance is 3.260 (1) A and the Cu-O-Cu bond angle is 115.2 (2) o