Journal
NEW JOURNAL OF CHEMISTRY
Volume 45, Issue 11, Pages 4994-5001Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nj05219a
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Funding
- Natural Science Foundation of China [21602003, 51432001, 51672002, 21871003]
- Lianyungang Natural Science Foundation [CG1517]
- Lianyungang petrel project
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Opening Foundation of Jiangsu Key Laboratory of Functional Control of Advanced Materials [jsklfctam201808]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX18_2611]
- National Science Centre (Poland) [DEC- 2019/35/B/ST4/03280, DEC-2016/22/M/ST4/00275]
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Heterometallic Ru-Pt and Zn-Pt complexes were prepared by self-assembly, exhibiting different absorption and emission characteristics. Ru-Pt complexes showed enhanced emission intensity while Zn-Pt complexes had decreased emission compared to their mononuclear precursors. Additionally, both Ru-Pt and Zn-Pt complexes demonstrated high two-photon absorption cross sections.
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 sigma(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 O-1(2) quantum yield compared to their mononuclear precursor.
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