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elements are of interest bacause of their magnetic properties.1,2 The synthesis and structural properites of trinuclear linear complexes based in Schiff base ligands have been the subject of considerable interest in our laboratories.3–5 We reported here a new hetero metallic trinuclearcomplex,[Ni2Co(NO2)2(C17H16N2O2)2C3H7(NO)2]. To synthesize the complex; to a solution of N,N′bis(salicylidene)-1,3-propandiamine 0.282 g (0.001 mol) in 50 ml hot methanol, 10 ml, 20% ammonia was added. After mixing this solution, a solution of 0.238 g (0.001 mol) NiCl2·6H2O in 30 ml hot water was added. After 2 h, light-green nickel complex was filtered and dried at 125 – 130 ̊C for 3 – 4 h in an oven. From this complex 0.339 g (0.001 mol) was then dissolved in 50 ml hot dimethylformamide. A solution of 0.119 g (0.0005 mol) CoCl2·6H2O in 20 ml of hot methanol and a solution of 0.069 g NaNO2 (0.001 mol) in 10 ml of hot water were added. The resulting mixture was set aside for 2 – 3 d. The precipitated crystals were filtered and dried in air. The structure was solved using the program SIMPEL, while for full matrix refinement the program LSFM was used; both were incorporated in the MolEN package. All non-H atoms were refined with anisotropic displacement parameters. The H atoms were placed geometrically 0.95 Å from their parent C atoms with UISO(H)=1.3Ueq(C). A riding model was subsequently used for all H atoms. The unit cell contains two molecules of the heterotrinuclear complex. The coordination around the central Co ion as well as the terminal Ni ions are distorted octahedral (Fig. 2). The Co-Ni pairs are each triply bridged, involving the O atoms of the ligand and O and N atoms of a nitrite group. The central Co ion occupying the inversion center at (0 0 0) has six O atoms as nearest neighbors: two from each ligand and one from each bridging nitrite group. Inversion related terminal Ni ions are coordinated by the two O and two N atoms of a ligand and one N atom from a nitrite and O atom from a dimethylformamide. The DMF and nitrite groups are mutually trans about the Ni ion. The coordination in the title compound is very similar to those observed in the literature cited above.

Crystal Structure of Trinuclear Complex, Bis[µ,N/N′-bis(salicylidene)-1,3-propanediaminato(dimethylformamide)-(µ-initrito-N)nickel(II)]cobalt(II)