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Two Photochromic Complexes Assembled by a Nonphotochromic Ligand: Photogenerated Radical Enhanced Room-Temperature Phosphorescence
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2020-12-22 , DOI: 10.1021/acs.inorgchem.0c02463 Wu-Ji Wei 1 , Ying Mu 1 , Li Wei 1 , Ji-Xiang Hu 1 , Guo-Ming Wang 1
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2020-12-22 , DOI: 10.1021/acs.inorgchem.0c02463 Wu-Ji Wei 1 , Ying Mu 1 , Li Wei 1 , Ji-Xiang Hu 1 , Guo-Ming Wang 1
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Stimulating tunable room-temperature phosphorescence (RTP) is still a challenge in photochromic systems, which is vital for multifunctional coordination materials. Herein, we synthesized two new photochromic chain complexes through self-assembly of the nonphotochromic 1,3,5-tris(4-pyridyl)benzene ligand, diphosphonate, and Ln(III) ions (1 for Ln(III) = Dy and 2 for Ln(III) = Gd). Both compounds showed fast photoresponses with the color turning from yellow to dark gray with a reversible decoloration by heating or storage in the dark. The electron transfer photochromic behavior with the generated stable radicals was further confirmed by the room-temperature UV–vis and electron paramagnetic resonance spectra. Furthermore, via tuning the generation and disappearance of stable radicals, reversible room-temperature fluorescence and phosphorescence for both compounds were switched by light irradiation and a thermal treatment, with an enhanced intensity for RTP and a decrease in fluorescence during the duration of Xe-lamp light irradiation. This work provides a new strategy that photogenerated radicals could promote and enhance RTP properties in functional materials.
中文翻译：
由非光致变色配体组装的两个光致变色配合物：光生自由基增强的室温磷光
在光致变色系统中，激发可调谐的室温磷光（RTP）仍然是一个挑战，这对于多功能配位材料而言至关重要。在此，我们通过自组装的nonphotochromic 1,3,5-三（4-吡啶基）苯配体，二膦酸盐和Ln（III）离子（合成了两个新的光致变色链复合1为LN（III）= Dy和2对于Ln（III）= Gd）。两种化合物均显示出快速的光响应，其颜色从黄色变为深灰色，通过在黑暗中加热或储存可逆脱色。室温下的UV-vis和电子顺磁共振光谱进一步证实了具有稳定自由基的电子转移光致变色行为。此外，通过调节稳定基团的产生和消失，两种化合物的可逆室温荧光和磷光通过光照射和热处理进行切换，从而增强了RTP的强度，并在Xe-lamp期间降低了荧光光照射。这项工作提供了一种新的策略，即光生自由基可以促进和增强功能材料中的RTP特性。
更新日期：2021-01-04
中文翻译：
由非光致变色配体组装的两个光致变色配合物：光生自由基增强的室温磷光
在光致变色系统中，激发可调谐的室温磷光（RTP）仍然是一个挑战，这对于多功能配位材料而言至关重要。在此，我们通过自组装的nonphotochromic 1,3,5-三（4-吡啶基）苯配体，二膦酸盐和Ln（III）离子（合成了两个新的光致变色链复合1为LN（III）= Dy和2对于Ln（III）= Gd）。两种化合物均显示出快速的光响应，其颜色从黄色变为深灰色，通过在黑暗中加热或储存可逆脱色。室温下的UV-vis和电子顺磁共振光谱进一步证实了具有稳定自由基的电子转移光致变色行为。此外，通过调节稳定基团的产生和消失，两种化合物的可逆室温荧光和磷光通过光照射和热处理进行切换，从而增强了RTP的强度，并在Xe-lamp期间降低了荧光光照射。这项工作提供了一种新的策略，即光生自由基可以促进和增强功能材料中的RTP特性。
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