TY - JOUR

T1 - Luminescence and Generation of Reactive Oxygen Species in Solution by Ta6Br12 Clusters

AU - Hernández, Jhon Sebastián

AU - Atienzar, Pedro

AU - Shamshurin, Maxim

AU - Benassi, Enrico

AU - Sokolov, Maxim N.

AU - Feliz, Marta

PY - 2024/12/15

Y1 - 2024/12/15

N2 - An intrinsic metal cluster NIR-II emission of the {Ta6Br12}2+ aqua/hydroxocomplexes was determined in aqueous solutions under inert atmosphere. The photoluminescence (PL) is enhanced in D2O, and the lifetime scale expands from nanoseconds to microseconds. Possible cluster emission transitions have been assigned and analyzed from a computational perspective. In the presence of O2, the cluster compound kept its robustness but showed partial quenching of the PL. Stern-Volmer and laser-flash photolysis studies confirmed that quenching is mainly associated with O2 diffusion. Laser-flash photolysis experiments showed that singlet oxygen (1O2) was not detected under measurement conditions. Generation of peroxide and superoxide radical species after irradiation in D2O was confirmed by using luminol as a probe, whereas no hydroxide radical species were detected as evidenced by the emission of the 3-coumarin carboxylic acid (3-CCA) molecular sensor.

AB - An intrinsic metal cluster NIR-II emission of the {Ta6Br12}2+ aqua/hydroxocomplexes was determined in aqueous solutions under inert atmosphere. The photoluminescence (PL) is enhanced in D2O, and the lifetime scale expands from nanoseconds to microseconds. Possible cluster emission transitions have been assigned and analyzed from a computational perspective. In the presence of O2, the cluster compound kept its robustness but showed partial quenching of the PL. Stern-Volmer and laser-flash photolysis studies confirmed that quenching is mainly associated with O2 diffusion. Laser-flash photolysis experiments showed that singlet oxygen (1O2) was not detected under measurement conditions. Generation of peroxide and superoxide radical species after irradiation in D2O was confirmed by using luminol as a probe, whereas no hydroxide radical species were detected as evidenced by the emission of the 3-coumarin carboxylic acid (3-CCA) molecular sensor.

KW - Reactive Oxygen Species (ROS)

KW - Tantalum cluster

KW - luminescence

KW - quantum chemical calculations

UR - https://www.mendeley.com/catalogue/3964df36-2ca2-3d62-a977-5e07e82a6914/

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85214453830&origin=inward&txGid=754dd86603f85d33c536a7e2aa781df1

U2 - 10.1002/chem.202403384

DO - 10.1002/chem.202403384

M3 - Article

C2 - 39676056

SP - e202403384

JO - Chemistry - A European Journal

JF - Chemistry - A European Journal

SN - 0947-6539

ER -