Citation: YIN Lu, LIANG Cheng, CHEN Ke-Xian, ZHAO Chen-Xuan, YAO Jia, Li Hao-Ran. Synthesis, Characterization, Spectroscopic Properties, and Luminescence Quenching Mechanism of a Pt(II) Complex Decorated with a π-Conjugated TEMPO-Terpyridine Ligand System[J]. Acta Physico-Chimica Sinica, ;2017, 33(7): 1390-1398. doi: 10.3866/PKU.WHXB201704111 shu

Synthesis, Characterization, Spectroscopic Properties, and Luminescence Quenching Mechanism of a Pt(II) Complex Decorated with a π-Conjugated TEMPO-Terpyridine Ligand System

YIN Lu ^1, ,
LIANG Cheng ² ,
CHEN Ke-Xian ³ ,
ZHAO Chen-Xuan ¹ ,
YAO Jia ¹ ,
Li Hao-Ran ^1,2

1.
ZJU-NHU United R & D Center, Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China;
2.
College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, P. R. China;
3.
School of Food Science and Biotechnology, Zhejiang Gongshang University Hangzhou, Hangzhou 310018, P. R. China

Received Date: 11 January 2017
Revised Date: 17 March 2017

Fund Project: The project was supported by the National Natural Science Foundation of China (21573196, J1210042), Program for Zhejiang Leading Team of S&T Innovation (2011R50007), National High Technology Research and Development Program of China (863) (SS2015AA020601), and Fundamental Research Funds of the Central Universities, China.

A novel Pt(II)-based metallointercalator terpyridine complex linked with a 2,2,6,6-tetramethyl-1-piperidinyl N-oxide (TEMPO) derivative was prepared by a reaction between 4'-TEMPO-terpyridine (L) and a Pt(II) salt. This complex presented unusual luminescence quenching owing to the effect of the stable nitroxide radical. The crystal structure of[Pt(terpy-TEMPO)Cl]Cl·H₂O·CH₃OH (terpy=2,2':6',2"-terpyridine) was elucidated by X-ray crystallography. Additionally, the effect of TEMPO on the photophysical properties of[Pt(terpy-TEMPO)Cl] Cl·H₂O·CH₃OH was investigated by UV-Vis, fluorescence emission, and electron paramagnetic resonance (EPR) spectroscopy. Data from the absorption and luminescence properties (298 K) of the[Pt(terpy-TEMPO)Cl]⁺ complex indicated the presence of two groups of typical bands:an intense band B with distinct vibronic structures (270-350 nm, ε>10⁴ dm³·mol^-1·cm^-1) and a less intense band A (370-450 nm, ε~10³ dm³·mol^-1·cm^-1). These two bands are generally assigned to ligand-to-ligand charge transfer (LLCT) and metal-to-ligand charge transfer (MLCT) excited states, respectively. Furthermore, efficient photoluminescent quenching behavior was observed in the emission spectra of this complex system. Quantum calculations of the molecular energy gaps and bands were performed by Gaussian 09 software. The calculated results verified that TEMPO greatly affects the energy gaps between the highest occupied molecular orbital and the lowest unoccupied molecular orbital. Thus, the relationship between efficient photoquenching and molecular structure was theoretically interpreted. EPR results indicated that when TEMPO is attached to a macrocyclic terpyridine platinum complex, e.g.,[Pt(terpy)Cl]⁺, the terpyridine platinum complex does not affect the hyperfine coupling constant (A value) and g factor (g values) but the rotation and relaxation times of the TEMPO radical.
- Terpyridine Pt(II) complex,
- Nitroxide radical,
- Synthesis,
- Photoluminescence,
- Electron paramagnetic resonance
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