Late transition metal complexes bearing nitrogen-containing ligands have many applications in biotechnology or industrial catalysis. In this thesis, we react two nitrogen-containing tridentate ligands with some late transition metal salts to yield complexes (1)-(18). Besides spectroscopic characterization, complexes (3), (5)-(7), (8), (10), (12)-(16) yielded crystal structures analyzed using X-ray single crystal diffraction. From crystal structure of complexes (3), (5)- (7), we concluded that the reaction of ligand and Cu(£L£L) salts always gave the CuLX2 products. In Ni series, structures of different coordination types were obtained by using different crystal-growing methods. Crystals obtained using diffusion method take on the form of MLX2 while different structures of complexes (8), (10) were obtained using double layer method. Judging from the result of ESI-Mass analyses, complexes (8) and (10) were both of the dimeric form[NiL1Cl(£g-Cl)]2. However complex (10) was shown by X-ray single crystal to be [NiL 2(H2O)2 Cl]Cl. This could be the hydration product from [NiL1Cl(£g-Cl)]2.