Synthesis and Characterization of Novel Tetradentate Macrocycle Ligand Type N4 (1,5,8,12 - Tetraazacyclotetradecan – 6,7,13,14 -tetraone)and Its Complexes With Co(II), Ni(II), Cu(II) and Zn(II). DJHR 2022, 1 (39). https://doi.org/10.57592/djhr.v1i39.2182.