2026-05-08T04:17:35Z https://www.eurjchem.com/index.php/eurjchem/oai

oai:ojs.www.eurjchem.com:article/1140 2015-03-31T07:18:02Z eurjchem:ART driver

Synthesis and characterization of manganese(II), cobalt(II), nickel(II), copper(II) and zinc(II) complexes with new Schiff base derived from 6,7-dimethyl-quinoxaline-2,3(1H,4H)-dione and thiosemicarbazide Al-Jibouri, Mahmoud Najim Hasun, Saad Mohammad Schiff base Quinoxaline Benzopyrazine Thiosemicarbazone Quinoxalin-2 3-dione Transition metal complexes New transition metal complexes of quinoxaline-2,3-dione-thiosemicarbazone ligand were prepared and characterized by elemental analysis, 1H and 13C NMR spectroscopy. The ligand (LH) was obtained by the reaction of 6,7-dimethyl-quinoxaline-2,3(1H,4H)-dione with thiosemicarbazide. All the complexes are found to be monomer in nature and have tetrahedral geometry. The IR spectra data revealed that the new Schiff base behaved as monobasic tridentate ligand through deprotonation of thiol-SH group, oxygen atom of C=O of pyrazine moiety and nitrogen atom of azomethine -C=N- group. However, the molar conductivity measurements proved the neutral nature of all metal complexes in DMSO solution, as well as the magnetic moment measurements investigated the high spin properties of all complexes. Atlanta Publishing House LLC 2015-03-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/1140 10.5155/eurjchem.6.1.44-47.1140 European Journal of Chemistry; Vol. 6 No. 1 (2015): March 2015; 44-47 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/1140/pdf_1140