Self-assembled heterometallic complexes showing enhanced two-photon absorption and their distribution in living cells

Heterometallic binuclear Ru-Pt and trinuclear Zn-Pt complexes were prepared via self-assembly by attaching Pt II -tpy (tpy = 2,2′:6′,2′′-terpyridine) onto the Ru II -tpy and Zn II -bis(tpy) moiety. The visible absorption bands for Ru-Pt complexes are primarily due to Ru II → tpy MLCT transitions wit...

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Veröffentlicht in:New journal of chemistry 2021-03, Vol.45 (11), p.4994-51
Hauptverfasser: Jiang, Qin, Yang, Xinda, Xiang, Pan, Dudek, Marta, Matczyszyn, Katarzyna, Samoc, Marek, Tian, Xiaohe, Zhang, Qiong, Luo, Yuhui, Wang, Daqi, Shi, Pengfei
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Sprache:eng
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Zusammenfassung:Heterometallic binuclear Ru-Pt and trinuclear Zn-Pt complexes were prepared via self-assembly by attaching Pt II -tpy (tpy = 2,2′:6′,2′′-terpyridine) onto the Ru II -tpy and Zn II -bis(tpy) moiety. The visible absorption bands for Ru-Pt complexes are primarily due to Ru II → tpy MLCT transitions with some overlap from Pt II → tpy MLCT, while no MLCT transition is observed for the Zn-Pt complex. The emission intensity of the Ru-Pt complexes was improved relative to the mononuclear Ru II precursor; however, the emission of Zn-Pt was decreased when compared with strongly emissive Zn II -bis(tpy). Z-scan results revealed relatively high two-photon absorption (TPA) cross sections σ 2 , with maximal values of 962 GM for Ru-Pt and 200 GM for Zn-Pt. All the heterometallic complexes were proved to localize preferably into lysosomes by confocal fluorescence imaging results, which also showed improved cell-free 1 O 2 quantum yield compared to their mononuclear precursor. Heterometallic complexes were prepared via self-assembly, showing enhanced TPA ability and preferable localization into lysosomes.
ISSN:1144-0546
1369-9261
DOI:10.1039/d0nj05219a