Song Chao-Yu, Chai Dong-Feng, Zhang Rui-Ren, Liu Hong, Qiu Yun-Feng, Guo Hua-Dong, Gao Guang-Gang
Department of Chemistry, College of Pharmacy, Jiamusi University, Jiamusi 154004, China.
Dalton Trans. 2015 Mar 7;44(9):3997-4002. doi: 10.1039/c4dt03826f.
A new silver(I)-alkynyl cluster with a Eu(W5O18)2 polyoxoanionic core of [Ag42{Eu(W5O18)2}((t)BuC≡C)28Cl4] [OH]·H2O (1) has been designed and synthesized. The Eu(W5O18)2 polyoxoanion acts as a template to induce the formation of the surrounding 42-core Ag(I) cage. Due to the hydrophobic silver(I)-alkynyl shell, 1 features an unusual fluorescence enhancement as compared to the precursor of the Eu(W5O18)2 polyoxoanionic core. Interestingly, the silver ions in the shell silver(I)-alkynyl cage can only be reduced to silver atoms by irradiation with high energy UV light (2 kW). Upon high UV irradiation, fluorescence quenching of 1 has been observed. Moreover, the solution fluorescence of 1 can be modulated by addition of S(2-) ions into the system, which also leads to the fluorescence quenching phenomenon. The successful synthesis of 1 demonstrates a new route to the detection of high energy UV irradiation or S(2-) ions by elaborate design of fluorescence quenching of silver(I)-alkynyl clusters.
一种新型的含银（I）-炔基簇合物[Ag42{Eu(W5O18)2}((t)BuC≡C)28Cl4][OH]·H2O（1）已被设计并合成，其具有Eu(W5O18)2多金属氧酸盐阴离子核。Eu(W5O18)2多金属氧酸盐阴离子作为模板诱导形成周围的42核银（I）笼。由于疏水的银（I）-炔基壳层，与Eu(W5O18)2多金属氧酸盐阴离子核的前体相比，1具有不寻常的荧光增强。有趣的是，壳层银（I）-炔基笼中的银离子只有通过高能紫外光（2千瓦）照射才能还原为银原子。在高紫外光照射下，观察到1的荧光猝灭。此外，向体系中加入S(2-)离子可调节1的溶液荧光，这也导致荧光猝灭现象。1的成功合成展示了一种通过精心设计银（I）-炔基簇合物的荧光猝灭来检测高能紫外光照射或S(2-)离子的新途径。
