Thiazol-2-thiolate-Bridged Binuclear Platinum(II) Complexes with High Photoluminescence Quantum Efficiencies of up to Near Unity.,Inorganic Chemistry

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Thiazol-2-thiolate-Bridged Binuclear Platinum(II) Complexes with High Photoluminescence Quantum Efficiencies of up to Near Unity.
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2020-08-31 , DOI: 10.1021/acs.inorgchem.0c01256
Maya Chaaban ₁ , Yu-Chieh Chi ₂ , Michael Worku ₃ , Chenkun Zhou ₄ , Haoran Lin ₁ , Sujin Lee ₁ , Azza Ben-Akacha ₁ , Xinsong Lin ₁ , Chen Huang _{2,

3,

5} , Biwu Ma _{1,

3,

4}

Affiliation

Binuclear platinum(II) complexes with strong Pt–Pt interactions are an interesting class of luminescent materials, of which photophysical properties could be controlled via multiple ways through organic ligands and Pt–Pt distance. While a number of binuclear platinum(II) complexes have been developed with tunable emissions, achieving high photoluminescence quantum efficiency (PLQE) remains challenging and of great interest. Here we report the synthesis and characterization of a series of binuclear 2,4-difluorophenylpyridine platinum(II) complexes bridged by thiazol-2-thiolate ligands with different bulkiness. The three complexes were found to have short Pt–Pt distances ranging from 2.916 to 2.945 Å. The strong Pt–Pt interactions lead to pronounced metal–metal-to-ligand charge transfer (MMLCT) absorptions between 450 and 500 nm, and strong ³MMLCT emissions in the orange/red region. The PLQEs of the new complexes are in the ranges of 2–31% in solution and 26–100% in solid state. These complexes also exhibit excellent stability in halogenated solvents.

中文翻译：

噻唑-2-硫醇盐桥连的双核铂（II）配合物，具有高达近统一的高光致发光量子效率。

具有强Pt–Pt相互作用的双核铂（II）配合物是一类有趣的发光材料，可以通过有机配体和Pt–Pt距离通过多种方式控制其光物理性质。虽然已经开发了许多具有可调发射的双核铂（II）配合物，但是实现高光致发光量子效率（PLQE）仍然具有挑战性，并且引起了人们的极大兴趣。在这里我们报告了由噻唑-2-硫醇盐配体桥接的具有不同体积的一系列双核2,4-二氟苯基吡啶铂（II）配合物的合成和表征。发现这三个复合物的Pt-Pt距离较短，范围为2.916至2.945Å。强大的Pt-Pt相互作用导致450-500 nm之间的明显的金属-金属-配体电荷转移（MMLCT）吸收³橙色/红色区域中的MMLCT排放。新复合物的PLQE在溶液中为2–31％，在固态为26–100％。这些配合物在卤代溶剂中也表现出优异的稳定性。

更新日期：2020-09-21

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