TRANSITION-METAL COMPLEXES OF N-(2-BENZAMIDE)PYRIDINE-2'-CARBOXAMIDE,A POTENTIALLY TRIDENTATE LIGAND CONTAINING ONE SECONDARY AND ONE PRIMARY AMIDE GROUP - PREPARATION AND CHARACTERIZATION IN THE SOLID-STATE

The synthesis of N-(2-benzamide)pyridine-2'-carboxamide (LH(2)) is rep orted along with its employment as a ligand. The new complexes [MCl(2) (LH(2))(2)].DMF (M = Co, Ni), [Cu2Cl4(LH(2))(2)].DMF, [CuCl2(LH(2))(2) ], [Co(OH)(LH)](n).nH(2)O, [M(2)(OH)(2)(H2O)(x)(LH)(2)](M = Ni, Cu; x= 4,2), [M(LH)(2)].xH(2)O (M = Ni, Cu; x = 0,1), [Ni(H2O)(2)(LH)(2)].H2 O, and [CuCl(LH)](n), where DMF = N,N-dimethylformamide, have been iso lated. The complexes were characterized by elemental analyses, conduct ivity measurements, x-ray powder patterns, thermal methods, variable-t emperature magnetic susceptibilities, and spectroscopic (IR and far-IR , ligand field, ESR) studies. A variety of stereochemistries is assign ed for the complexes in the solid state. The neutral ligand acts as a bidentate chelating agent with ligated atoms being the ring nitrogen a nd the secondary amide oxygen; the LH(-) ion behaves as a bidentate ch elating N-ring, N-secondary amide or as a tridentate N-ring, N-seconda ry amide , O-primary amide ligand depending mainly on the reaction con ditions.