Abstract
The triplet-triplet (T-T) absorption spectra and the T-T absorption decay kinetics are measured for solutions of 9-anthracenecarboxylic acid (ACA) and its complexes with metal ions (Cd3+ and Ln3+=Y3+, La3+, Ce3+, Eu3+, Gd3+, and Tb3+) in dimethylsulfoxide (DMSO) by the methods of flashlamp and laser pulse photolysis. The rate constants kT of intracomplex quenching of the triplet state are measured for ACA complexes with ions Gd3+, Ce3+, Tb3+, and Eu3+. Larger values of kT in complexes of ACA with paramagnetic ions Ce3+, Tb3+, and Eu3+, which have low-lying energy levels, compared to the values of kT for complexes with other ligands (pyrene-3-sulfonate, pyrene-1,3,6,8-tetrasulfonate, and benzo[ghi]perylene-1,2-dicarboxylate) were explained by the lower energy of the triplet state of ACA (14400 cm−1). For a complex with a paramagnetic ion Gd3+, which has no low-lying energy levels, the value of kT is close to that measured by us earlier for the inner-sphere complex of pyrene-1,3,6,8-tetrasulfonate with the same ion. These results confirm our earlier assumption about the inner-sphere complexing of ACA with Ln3+ ions in DMSO.
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