Five complexes ([Cu(tpc)] 2+ 1, [Cu(tpa)] 2+ 2, [Co(tpa)] 2+ 3, [Fe(tpa)] 2+ 4 and [Mn(tpa)] 2+ 5) (tpc = N, N’, N" tris[(2 pyridyl)methyl] 1,4,7 triaza cyclononane(L1) and tpa = tris[2 ((2 pyridyl)methyl imino)ethyl]amine(L2)) were synthesized and characterized. The crystal structures of 1, 3 and 4 were determined by X ray crystallography. Electrochemical investigations over two cupric complexes reveal that 2 has a less negative redox potential than that of 1. Electronic spectra of 2, 3, 4 and 5 show that the distinction in metal ion results in a shift of the ligand based π*←π transition.
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