Teng Ji, Falong Yan, Yang Zhang, Qun Lu, Kaige Gao
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引用次数: 0
摘要
报道了两种新型一维（1D）卤化铅弹性晶体[Pb2Br4(DMA)2]n (1) （DMA = n， n -二甲基乙酰胺）和[Pb2Br4(DMF)2]n (2) （DMF = n， n -二甲基甲酰胺）。化合物1和2均具有中性一维双金属轴链结构。化合物1的弯曲应变为1.36%，高于所有已报道的一维单金属轴链配位聚合物，表明一维双金属轴链聚合物具有优越的弹性性能。化合物1在200 K以下表现出较强的红-近红外（NIR）荧光发射，发射峰位于700 nm处，半峰全宽为200 nm，表明化合物1具有较强的电子-声子耦合。化合物1的大Stokes位移和宽fwhm可能归因于其优异的弹性，因为这种弹性允许分子的自捕获激子状态经历更大的结构扭曲。研究表明，一维有机卤化铅弹性晶体在高效近红外发光二极管、超连续光源和柔性近红外光波导等领域具有广阔的应用前景。
One-Dimensional Organic Lead Bromide Elastic Crystals with Strong Electron–Phonon Coupling
Two novel one-dimensional (1D) lead halide elastic crystals, [Pb2Br4(DMA)2]n (1) (DMA = N,N-dimethylacetamide) and [Pb2Br4(DMF)2]n (2) (DMF = N,N-dimethylformamide), were reported. Both compounds 1 and 2 feature a neutral 1D bimetallic axis chain structure. The bending strain of compound 1 is 1.36%, higher than those of all reported 1D single-metal axis chain coordinate polymers, indicating the superior elastic properties of the 1D bimetallic axis chain polymers. Compound 1 exhibits strong red-to-near-infrared (NIR) fluorescence emission below 200 K, with an emission peak at 700 nm and a full width at half maximum (fwhm) of 200 nm, indicating strong electron–phonon coupling in compound 1. The large Stokes shift and broad fwhm of compound 1 may be attributed to its excellent elasticity, as this elasticity allows the molecule’s self-trapped exciton state to undergo greater structural distortion. It is suggested that 1D organic lead halide elastic crystals could be promising candidates for emerging applications in efficient NIR light-emitting diodes, supercontinuum sources, and flexible NIR optical waveguides.
期刊介绍：
The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.
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