Room Temperature Tryptophan Phosphorescence of Proteins in the Composition of Biological Membranes and Solutions

Ratiometric Luminescence Detection of Copper(I) by a Resonant System Comprising Two Antenna/Lanthanide Pairs

“…A simplified Jablonski–Perrin diagram for LCCR TbEu is shown in Figure . Tryptophan and naphthalene singlet excited states (S 1 ) are located at 32,000 and 31,000 cm –1 , respectively, and their triplet excited states (T 1 ) lie at 24,100 and 21,100 cm –1 , respectively. − Due to the small energy difference between the two S 1 states, bidirectional EET is possible between them (blue arrow #1 in Figure ). Since the cation−π interaction increases ISC in the tryptophan, resulting in an enhanced T 1 population, , triplet–triplet EET between tryptophan and naphthalene (blue arrow #2) can be considered as well.…”

Lanthanide Luminescence Modulation by Cation–π Interaction in a Bioinspired Scaffold: Selective Detection of Copper(I)

“…In addition to the global ISC enhancement, the cation p interaction with Cu + and Ag + shifts the tryptophan triplet excited state emission but to ad ifferent extent. Indeed, comparison of the room temperature phosphorescence spec tra of Cu I •LCC1 La and Ag I •LCC1 La (SI) with those reported in the literature for proteins [23,24] show that Cu + and Ag + lower the energy of the excited triplet state of tryptophan by ca. 2300 cm À1 and 500 cm À1 ,respectively.…”