Thiazol-2-thiolate-Bridged Binuclear Platinum(II) Complexes with High Photoluminescence Quantum Efficiencies of up to Near Unity
Thiazol-2-thiolate-Bridged Binuclear Platinum(II) Complexes with High Photoluminescence Quantum Efficiencies of up to Near Unity
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DOI：
10.1021/acs.inorgchem.0c01256
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发表时间：
2020-09-21
影响因子：
4.6
通讯作者：
Ma, Biwu
中科院分区：
文献类型：
--
作者：
Chaaban, Maya;Chi, Yu-Chieh;Ma, Biwu
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，其物理性质可以通过有机配体和Pt-Pt距离通过多种方式进行调控。虽然已经开发了许多具有可调谐发射的双核铂（II）配合物，但实现高光致发光量子效率（PLQE）仍然具有挑战性并且引起极大兴趣。在这里，我们报告了一系列的双核2，4-二氟苯基吡啶铂（II）配合物的噻唑-2-硫醇配体具有不同的体积桥接的合成和表征。这三种配合物的Pt-Pt距离都很短，在2.916 ~ 2.945之间。强的Pt-Pt相互作用导致在450和500 nm之间的明显的金属-金属-配体电荷转移（MMLCT）吸收和在橙子/红色区域的强（MMLCT）-M-3发射。新配合物的PLQE在溶液中为2-31%，在固态中为26-100%。这些配合物在卤化溶剂中也表现出优异的稳定性。
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 A. The strong Pt-Pt interactions lead to pronounced metal-metal-to-ligand charge transfer (MMLCT) absorptions between 450 and 500 nm, and strong (MMLCT)-M-3 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.