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Title: Room-Temperature Phosphorescence and Efficient Singlet Oxygen Production by Cyclometalated Pt(II) Complexes with Aromatic Alkynyl Ligands
Authors: Lázaro, Ariadna
Cunha, Carla
Bosque, Ramon
Pina, João 
Ward, Jas S
Truong, Khai-Nghi
Rissanen, Kari
Lima, João Carlos 
Crespo, Margarita
Melo, J. Sérgio Seixas de 
Rodríguez, Laura
Issue Date: 15-Jun-2020
Publisher: ACS Publications
Project: UID/QUI/50006/2013 Associated Laboratory for Green Chemistry - Clean Technologies and Processes 
info:eu-repo/grantAgreement/EC/FP7/284464/EU/The Integrated Initiative of European Laser Research Infrastructures III 
Serial title, monograph or event: Inorganic Chemistry
Volume: 59
Issue: 12
Abstract: The synthesis of five novel cyclometalated platinum(II) compounds containing five different alkynyl-chromophores was achieved by the reaction of the previously synthesized Pt-Cl cyclometalated compound (1) with the corresponding RC≡CH by a Sonogashira reaction. It was observed that the spectral and photophysical characteristics of the cyclometalated platinum(II) complexes (Pt-Ar) are essentially associated with the platinum-cyclometalated unit. Room-temperature emission of the Pt-Ar complexes was attributed to phosphorescence in agreement with DFT calculations. Broad nanosecond (ns)-transient absorption spectra were observed with decays approximately identical to those obtained from the emission of the triplet state. From the femtosecond-transient absorption (fs-TA) data, two main excited-state decay components were identified: one in the order of a few picoseconds was assigned to fast intersystem crossing to populate the triplet excited-state and the second (hundreds of ns) was associated with the decay of the transient triplet state. In general, efficient singlet oxygen photosensitization quantum yields were observed from the triplet state of these complexes.
ISSN: 0020-1669
DOI: 10.1021/acs.inorgchem.0c00577
Rights: embargoedAccess
Appears in Collections:I&D CQC - Artigos em Revistas Internacionais

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