title: 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.
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.
authors: 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.
authors: Yongchen
authors: Y
authors: Hu
authors: Kenneth Hoi-Yiu
authors: KH
authors: Chan
authors: Clive Yik-Sham
authors: CY
authors: Chung
authors: Vivian Wing-Wah
authors: VW
authors: Yam