Multifunctional Self-Assembled Macrocycles with Enhanced Emission and Reversible Photochromic Behavior
Multifunctional Self-Assembled Macrocycles with Enhanced Emission and Reversible Photochromic Behavior
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DOI：
10.1021/acs.inorgchem.9b00039
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发表时间：
2019-03-18
影响因子：
4.6
通讯作者：
Mukherjee, Partha Sarathi
中科院分区：
文献类型：
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作者：
Bhattacharyya, Soumalya;Chowdhury, Aniket;Mukherjee, Partha Sarathi
报道了一系列自组装功能Pt（II）分子六边形（M1-M3）。阻碍子M1和M2分别采用聚集诱导的发射和光致变色结构单元设计，而大环M3是双官能的，包含两种结构单元。阻碍子M1和M3被发现继承了增强的发射与聚集体的形成，这是探索使用紫外-可见和荧光光谱。与其结构单元相比，大环M3的增强的发射是由金属配体配位和纳米聚集体的形成驱动的，如从SEM、DLS和TEM分析中显而易见的。两个大环（M2和M3）也被发现是光致变色的，由于螺吡喃的存在下，在分子骨架。由于螺吡喃的质子化去质子化平衡，这些大环化合物（M2和M3）表现出可逆的酸致变色行为。大环M3代表了自组装Pt（II）结构的第一个实例，其具有聚集诱导发射（AIE）、光致变色和酸致变色性质的多功能。与起始结构单元相比，这种新一代大环（M3）还显示出配位驱动的增强发射和光诱导的颜色变化行为。我们目前的方法是将多种功能整合到一个单一的自组装结构中，与通过配位自组装的起始构建块相比，具有增强的功能性，这是值得注意的，并且具有开发多功能材料的巨大潜力。
A series of self-assembled functional Pt(II) molecular hexagons (M1-M3) is reported. Hexagons M1 and M2 were designed employing aggregation induced emissive and photochromic building blocks, respectively, while macro cycle M3 is a bifunctional, containing both the kinds of building units. Hexagons M1 and M3 were found to inherit the enhanced emission with aggregate formation which was explored using UV-vis and fluorescence spectroscopy. The enhanced emission of macrocycle M3 compared to that of its building units was driven both by metal ligand coordination and formation of nanoaggregates as evident from SEM, DLS and TEM analyses. Two of the macrocycles (M2 and M3) were also found to be photochromic due to the presence of spiropyran in the molecular backbone. Due to the virtue of protonation deprotonation equilibrium of the spiropyran, these macrocycles (M2 and M3) showed reversible acidochromic behavior. Macrocycle M3 represents the first example of a self-assembled Pt(II) architecture which is multifunctional with aggregation-induced emission (AIE), photochromic, and acidochromic properties. This new generation macrocycle (M3) also showed coordination-driven enhanced emission and light-induced color change behavior compared to the starting building blocks. Our present approach of incorporating multiple functions into a single self-assembled structure with enhanced functionality compared to the starting building blocks via coordination self-assembly is noteworthy and has huge potential for the development of multifunctional materials.