Room-Temperature Phosphorescence and Efficient Singlet Oxygen Production by Cyclometalated Pt(II) Complexes with Aromatic Alkynyl Ligands

Ariadna Lázaro, Carla Cunha, Ramon Bosque, João Pina, Jas S. Ward, Khai Nghi Truong, Kari Rissanen, João Carlos Lima, Margarita Crespo, J. Sérgio Seixas De Melo, Laura Rodríguez

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5 Citations (Scopus)

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 RCCH 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.

Original languageEnglish
Pages (from-to)8220-8230
Number of pages11
JournalInorganic Chemistry
Volume59
Issue number12
DOIs
Publication statusPublished - 15 Jun 2020

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