Reversible thermo-responsive luminescent metallo-supramolecular triblock copolymers based on platinum(II) terpyridyl chromophores with unusual aggregation behaviour and red-near-infrared (NIR) emission upon heating |
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| Authors: | Hu Yongchen Chan Kenneth Hoi-Yiu Chung Clive Yik-Sham Yam Vivian Wing-Wah |
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| Institution: | Institute of Molecular Functional Materials (Areas of Excellence Scheme, University Grants Committee, Hong Kong) and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, PR China. |
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| Abstract: | Two platinum(II) terpyridyl-based metallo-supramolecular triblock copolymers, ClPt(tpy)PEO-PPO-PEO(tpy)PtCl](OTf)(2) (1) and (Ph-C≡C)Pt(tpy)PEO-PPO-PEO(tpy)Pt(C≡C-Ph)](OTf)(2) (2), have been synthesized and characterized. The two complexes were found to aggregate with PtPt and/or π-π interactions at high temperature, which have not been reported so far, as revealed by UV/Vis absorption, emission and (1)H NMR study. This is due to the formation of spherical micelles driven by the PEO-PPO-PEO copolymers at temperatures above the critical micelle temperature, which was confirmed by TEM and DLS. The red-near-infrared (NIR) emission of the complexes can be switched on and off by at least ten cycles of heating and cooling, suggesting that the micellization was highly reversible. |
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