Table 1. Quantum Yields (Φ_t-c) and Photoisomerization Rate Constants (k_iso, s^–1) of H₂L and [Ln₂L₃(DMSO)₄] Complexes in Different Solvents.

	ethanol		acetonitrile
compounds	103Φt→c	104kiso	103Φt→c	104kiso
H2L	41.1 ± 0.45	88.7 ± 5.7	22.7 ± 0.26	70.1 ± 5.3
[Eu2(L)3(DMSO)4]	7.07 ± 0.26	69.1 ± 2.3	6.82 ± 0.34	63.5 ± 3.1
[Gd2(L)3(DMSO)4]	5.80 ± 0.32	65.0 ± 3.6	4.30 ± 0.29	74.3 ± 4.1
[Tb2(L)3(DMSO)4]	6.37 ± 0.39	79.3 ± 4.2	6.16 ± 0.42	81.0 ± 5.1