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12 Eclética Química Journal, vol. 45, n. 3, 2020, 12-27 ISSN: 1678-4618 DOI: 10.26850/1678-4618eqj.v45.3.2020.p12-27 Complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with ligand formed by condensation reaction of isatin with glutamic acid Wiesława Ferenc , Dariusz Osypiuk, Jan Sarzyński, Halina Głuchowska Maria Curie-Skłodowska University, Institute of Chemical Sciences, Faculty of Chemistry, Department of General and Coordination Chemistry and Crystallography, 20-031 Lublin, Poland