Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume 2022, Issue 36, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.202200534
Keywords
Density functional calculations; Luminescence; Photochromism; Platinum; Sulfur heterocycles
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Funding
- UGC by The University of Hong Kong
- Strategically Oriented Research Theme (SORT) on Functional Materials for Molecular Electronics
- Research Grants Council (RGC) General Research Fund (GRF) of the Hong Kong Special Administrative Region, P. R. China [HKU 17309220]
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A series of cyclometalated platinum(II) complexes with a dithienylethene-containing N^C and an ancillary O^O ligand have been synthesized and characterized. These complexes exhibit photochromism that can be triggered by photoexcitation and their photophysical and photochromic properties can be tuned by varying the ligands. Moreover, the complexes demonstrate fatigue resistance and thermal irreversibility, making them promising candidates for various applications.
A series of cyclometalated platinum(II) complexes with a dithienylethene-containing N<^>C and an ancillary O<^>O ligand have been synthesized and characterized. All the complexes, [Pt(thpy-DTE)(dtpd)] (1), [Pt(CF3-thpy-DTE)(dtpd)] (2) and [Pt(Me-thpy-DTE)(dtpd)] (3), exhibit photochromism that can be triggered by photoexcitation at 420 nm into the metal-to-ligand charge transfer (MLCT)/intraligand charge transfer (ILCT) band at the visible region, which is accompanied with colour changes from yellow to green, as well as the quenching of red phosphorescence originated from the emissive triplet intraligand ((IL)-I-3) excited state. The photophysical and photochromic properties can be readily tuned by varying the ligands. Moreover, the fatigue resistance and thermal irreversibility of this series of complexes have also been demonstrated by the representative complex 1 with persistence of the photochromic activity after six photoswitching cycles and a thermal decay half-live of 4.8 days even at 308 K.
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