A thiophenic alkynylplatinum(II) terpyridyl complex: synthesis and photophysical properties

Abstract

A new thiophenic alkynylplatinum(II) terpyridyl complex [tBuArC≡CPt(tpy)]PF₆ (tpy = 2,2′:6′,2″-terpyridine; Ar = [(MeC₄H₂S)(C≡C)]₂C₆H₂) has been synthesized in five steps in 45% total yield. The photophysical properties were studied by steady-state spectroscopy and transient spectroscopy and obvious metal-metal interactions and π-π stacking were found in a series of solvents. Concentration dependent emission data show that the complex exhibited aggregation-induced fluorescence enhancement at low concentrations while aggregation-induced fluorescence quenching at high concentrations. The complex displayed biexponential decays with lifetimes in the range of nanoseconds in dilute dichloromethane and acetonitrile solutions.

Graphical Abstract

Keywords:

• Alkynylplatinum(II)
• synthesis
• luminescence
• aggregation

Acknowledgements

The authors wish to thank Prof. Wei Xiong, Dr. Hao Ding at Chongqing University of Science and Technology and Dr. Jing Zeng at Southwest Medical University for their helpful discussions. The authors thank the anonymous reviewers for their valuable comments and suggestions to improve the paper.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China under Grant number 21801031 and the Natural Science Foundation Project of Chongqing under Grant numbers cstc2019jcyj-msxmX0404 and cstc2020jcyj-msxmX0670.