Abstract: | The electronic absorption spectra of aqueous solutions containing copper(II) ion and N, N′-bis(carbamoylmethyl)trimethylenediamine(L-1, 3, 1) at 25.0 ± 0.1°C and 0.10 mol L?1 NaClO4, were measured as a function of pH. The absorption maxima and the molar absorptivities of [Cu(L-l, 3, l)]2+, [Cu(H.1L-1, 3, 1)]+, and [Cu(H-2L-l, 3, l)] were calculated from these spectra. A comparison of the spectral parameters of these complexes with those of the copper(lI)-diaminodiamide complexes containing 6, 5, 6-and 6, 6, 6-membered ring systems indicates that the chelate ring size has significant effects on these spectral parameters. |