Abstract
Two new tetrahedral Co(II) complexes, Co(dmphen)Cl-2) (1) and
Co(ph(2)dmphen)Cl-2(2)center dot CHCl3 (2), (where dmphen =
2,9-dimethyl-1,10-phenanthroline, or neocuproine and ph(2)dmphen =
2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, or bathoneocuproine) were
synthesized and characterized by elemental analysis, and by IR,
UV-visible and H-1 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 (chi = 2.31 x 10(-5) and 6.96 x 10(-6)) of 1 and 2 by H-1
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.
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