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Ichiro Fujita, Takanori Yazaki, Yasuo Torii, Hiroshi Kobayashi, Electronic Absorption Spectra of Tris(2,2′-bipyridine)- and Tris(1,10-phenanthroline) Complexes of Vanadium(II) and Chromium(II), Bulletin of the Chemical Society of Japan, Volume 45, Issue 7, July 1972, Pages 2156–2161, https://doi.org/10.1246/bcsj.45.2156
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Abstract
Electronic absorption spectra of tris(2,2′-bipyridine) complexes of vanadium(II) and chromium(II) were measured. When methyl groups are introduced into the coordinating bipyridine, (d, d*) transitions in the central metal, (π, π*) transitions in the coordinating ligand, and “metal to ligand” charge-transfer transitions show their respective characteristic shifts. Thus the visible and near-infrared bands of tris(2,2′-bipyridine) complexes of vanadium(II) and chromium(II) are assigned to “metal to ligand” charge-transfer transitions as well as the visible bands of tris(2,2′-bipyridine)iron(II). A comparison between the corresponding bands of tris(2,2′-bipyridine) complexes and tris (1,10-phenathroline) complexes also verifies the assignment.
