Synthesis, characterization, and crystal structure of new four-coordinated cobalt(II) complexes containing phenanthroline derivatives

چکیده مقاله

Two new tetrahedral Co(II) complexes, [Co(dmphen)Cl₂)] (1) and [Co(ph₂dmphen)Cl₂]₂·CHCl₃ (2), (where dmphen = 2,9-dimethyl-1,10-phenanthroline, or neocuproine and ph₂dmphen = 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, or bathoneocuproine) were synthesized and characterized by elemental analysis, and by IR, UV-visible and ¹H NMR spectroscopy. Single-crystal X-ray diffraction study of the two compounds revealed analogous tetrahedral arrangements of the ligands around the cobalt(II) ion. Measurement of magnetic susceptibility (χ = 2.31 × 10^-5 and 6.96 × 10^-6) of 1 and 2 by ¹H NMR spectroscopy (Evans method) revealed their magnetic moments were 4.32 and 4.29 BM, respectively, which also suggests tetrahedral coordination in the two complexes, with S = 3/2. © 2013 Springer Science+Business Media Dordrecht.