Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 143, Issue 28, Pages 10659-10667Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.1c04200
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Funding
- National Natural Science Foundation of China [21871297, 21503284, 21725304, 11774125]
- Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials [2019B121205002]
- General Research Fund (GRF) grant from the Research Grants Council of the Hong Kong Special Administrative Region, People's Republic of China [HKU17306219]
- CAS-Croucher Funding Scheme for Joint Laboratory on Molecular Functional Materials for Electronics, Switching and Sensing
- Innovation Technology Commission to the State Key Laboratory of Synthetic Chemistry, The University of Hong Kong
- Sun Yat-Sen University
- Hangzhou Normal University
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The research successfully modulated the color, solubility, luminescence properties, and self-assembly behaviors of dinuclear cyclometalated platinum(II) complexes by introducing alkoxy chains of different lengths. The study also revealed the emission origins in different excited states and the response of luminescence properties to external pressure changes.
In this work, through the introduction of different lengths of alkoxy chains to the dinuclear cyclometalated platinum(II) complexes, the apparent color, solubility, luminescence properties, and self-assembly behaviors have been remarkably modulated. In the solid state, the luminescence properties have been found to arise from emission origins that switch between the (MMLCT)-M-3 excited state in the red solids and the 3IL excited state in the yellow state, depending on the alkoxy chain lengths. The luminescence of the yellow solids is found to show obvious bathochromic shifts under mechanical grinding and decreased intensity under controllable hydrostatic pressure. However, the emission of the red solids exhibits both a bathochromic shift and reduced intensity due to the isotropic compression-induced shortening of the Pt center dot center dot center dot Pt and pi-pi distances. By combining the data obtained from X-ray diffraction (XRD), infrared (IR), and X-ray single crystal structure, a better understanding of the relationship between molecular aggregation and photophysical properties has been realized, suggesting that the length of the alkoxy chains plays an important role in governing the supramolecular assemblies.
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