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The properties of the lowest excited triplet state (T 1 ) of 2',3',5'-tri-O-acetyl-4-thiouridine (TU) and its 5-halogeno substituted derivatives (XTU, X = F, Cl, Br and I) in CCl 4 solutions are presented. Steady-state and pulsed techniques were used to characterize the T 1 state of TU and XTU in terms of the phosphorescence quantum yields (φ p0 ), intrinsic lifetimes...