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Lanthanide-Functionalized Metal–Organic Framework Hybrid Systems To Create Multiple Luminescent Centers for Chemical Sensing
Accounts of Chemical Research ( IF 18.3 ) Pub Date : 2017-10-06 00:00:00 , DOI: 10.1021/acs.accounts.7b00387
Bing Yan 1
Affiliation  

Metal–organic frameworks (MOFs) possess an important advantage over other candidate classes for chemosensory materials because of their exceptional structural tunability and properties. Luminescent sensing using MOFs is a simple, intuitive, and convenient method to recognize species, but the method has limitations, such as insufficient chemical selectivity and signal loss. MOFs contain versatile building blocks (linkers or ligands) with special chemical reactivity, and postsynthetic modification (PSM) provides an opportunity to exploit and expand their unique properties. The linkers in most MOFs contain aromatic subunits that can readily display luminescence after ultraviolet or visible (typically blue) excitation, and this is the main luminescent nature of most MOFs. The introduction of photoactive lanthanide ions (Ln3+) into the MOF hosts may produce new luminescent signals at different positions from that of the MOF linker, but this depends on the intramolecular energy transfer (antenna effect) from the MOF (linkers) to the Ln3+ ions. Controlling the Ln3+ content in MOF hybrids may create multiple luminescent centers. The nature of the unique luminescent centers may cause different responses to sensing species (i.e., ratiometric sensing), which may provide a new opportunity for luminescence research with applications to chemical sensing.

中文翻译:

镧系元素官能化的金属-有机骨架混合系统可创建多个化学感应发光中心

金属-有机骨架(MOF)由于其出色的结构可调性和性能,比其他候选类别的化学感应材料具有重要优势。使用MOF进行发光感测是一种识别物种的简单,直观且方便的方法,但该方法具有局限性,例如化学选择性不足和信号丢失。MOF包含具有特殊化学反应性的通用结构单元(连接基或配体),而后合成修饰(PSM)为开发和扩展其独特性能提供了机会。大多数MOF中的连接基均包含芳族亚基,这些基团在紫外线或可见光(通常为蓝色)激发后很容易显示出发光,这是大多数MOF的主要发光性质。光敏镧系离子(Ln 3+进入MOF的宿主可能会在与MOF接头不同的位置产生新的发光信号,但这取决于从MOF(接头)到Ln 3+离子的分子内能量转移(天线效应)。控制MOF杂化物中Ln 3+的含量可能会产生多个发光中心。独特的发光中心的性质可能会导致对传感物种(即比率传感)的不同响应,这可能为在化学传感中应用的发光研究提供新的机会。
更新日期:2017-10-06
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