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 |
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Hauptverfasser: | , , , , , , , , , , |
Format: | Artikel |
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. |
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ISSN: | 1144-0546 1369-9261 |
DOI: | 10.1039/d0nj05219a |