A small bimetallic Ag3Cu2 nanocluster with dual emissions within and against Kasha's rule,Nanoscale

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A small bimetallic Ag3Cu2 nanocluster with dual emissions within and against Kasha's rule
Nanoscale ( IF 5.8 ) Pub Date : 2020/03/09 , DOI: 10.1039/d0nr00471e
Rajini Anumula _{1,

2,

3,

4,

5} , Pin Xiao _{6,

7,

8,

9,

10} , Chaonan Cui _{1,

2,

3,

4,

5} , Haiming Wu _{1,

2,

3,

4,

5} , Ganglong Cui _{6,

7,

8,

9,

10} , Wei-Hai Fang _{6,

7,

8,

9,

10} , Zhixun Luo _{1,

2,

3,

4,

5} , Jiannian Yao _{1,

2,

3,

4,

5}

Affiliation

Single crystals of a small bimetallic Ag₃Cu₂ nanocluster protected by six ligands of 2,4-dimethylbenzene thiol are synthesized by a one-pot procedure of wet chemistry. This Ag₃Cu₂ nanocluster bears a trigonal bipyramid metallic core with two copper atoms located on both sides of a triangular Ag₃. Interestingly, the six Cu–Ag side edges of the trigonal bipyramid are fully protected by the six ligands giving rise to reinforced stability and high chemical purity. More interestingly, this Ag₃Cu₂ cluster shows strong dual fluorescence emissions in both ultraviolet visible (UV-vis) and near infrared (NIR) regions. Theoretical calculations reproduce the absorption and fluorescence spectra where the NIR emission at 824 nm is assigned to the S₁ → S₀ transition, while the simultaneous emission in the visible band is due to the radiation of highly excited states and is against Kasha's rule.

中文翻译：

一种小型双金属Ag3Cu2纳米簇，在Kasha规则之内并违反该规则具有双重发射

通过湿化学的一锅法合成了由6,2,4-二甲基苯硫醇的配体保护的小的双金属Ag ₃ Cu ₂纳米簇的单晶。该Ag ₃ Cu ₂纳米团簇具有三角形的双锥体金属核，在三角形的Ag _3的两侧具有两个铜原子。有趣的是，三角形双锥体的六个Cu-Ag侧边缘被六个配体完全保护，从而增强了稳定性并提高了化学纯度。更有趣的是，这种Ag ₃ Cu ₂团簇在紫外可见（UV-vis）和近红外（NIR）区域均显示出强大的双重荧光发射。理论计算重现了吸收光谱和荧光光谱，其中在824 nm处的近红外发射被分配给S ₁ →S ₀跃迁，而可见光波段中的同时发射是由于高激发态的辐射引起的，并且违反了卡沙定律。

更新日期：2020-04-09

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