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

Yongchen Hu; Kenneth Hoi-Yiu Chan; Clive Yik-Sham Chung; Vivian Wing-Wah Yam

doi:10.1039/c1dt10741k

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

Dalton Trans. 2011 Dec 7;40(45):12228-34. doi: 10.1039/c1dt10741k. Epub 2011 Aug 30.

Authors

Yongchen Hu¹, Kenneth Hoi-Yiu Chan, Clive Yik-Sham Chung, Vivian Wing-Wah Yam

Affiliation

¹ 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.

PMID: 21879082
DOI: 10.1039/c1dt10741k

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.