Targeted Construction of Light-Harvesting Metal-Organic Frameworks Featuring Efficient Host-Guest Energy Transfer
Targeted Construction of Light-Harvesting Metal-Organic Frameworks Featuring Efficient Host-Guest Energy Transfer
复制标题
有针对性地构建具有高效主客体能量转移功能的光捕获金属有机框架
DOI：
10.1021/acsami.7b17755
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发表时间：
2018
影响因子：
9.5
通讯作者：
Chen Long
中科院分区：
文献类型：
--
作者：
Zhao Xiaoyu;Song Xiaoyu;Li Yang;Chang Ze;Chen Long
金属有机骨架(MOF)是一种很有前途的能量转移材料捕光平台。然而，有针对性地构建具有理想的光物理性质和孔结构的MOF仍然是一个挑战。因此，选择1，1，2，2-tetrakis(4-(pyridin-4-yl)phenyl)ethene(Tppe)作为构筑捕光MOF的配基，是因为其具有高发射性和刚性的主链，有利于MOF的捕光性能。根据不同的金属中心(锌离子和镉离子)和不同的羧酸盐基团，得到了三种MOF(MOFs1-3)。MOF的完整结构表征有助于阐明该体系的结构调整原理。三种MOF都表现出很强的tppe起源的光致发光，量子产率高达47.6%。荧光量子产率和时间分辨荧光研究表明，该体系具有显著的能量转移效率(最高可达96%)。这些结果清楚地表明，TPPE-MOF可能是一种很有前途的捕光材料。
Metal–organic frameworks (MOFs) have emerged as promising light-harvesting platforms for energy-transfer materials. However, the targeted construction of MOFs with desirable photophysical properties and pore structures is still a challenge. Herein, 1,1,2,2-tetrakis(4-(pyridin-4-yl)phenyl)ethene (tppe) is selected as the ligand for the construction of light-harvesting MOFs due to its highly emissive and rigid backbone, which could benefit the light-harvesting performance of the MOFs. Three MOFs (MOFs1–3) were obtained on the basis of different metal centers (Zn2+and Cd2+) and carboxylate building blocks. The complete structure characterization of the MOFs helps the illustration of the principles for structure tuning of this system. All three MOFs exhibit strong tppe-originated photoluminescence emission, with quantum yields as high as 47.6%. The fluorescence quantum yield and time-resolved fluorescence studies reveal that a remarkable energy-transfer efficiency (up to 96%) was achieved in this system. These results clearly indicate tppe-MOFs could be promising light-harvesting materials.