Abstract
Exploring the discrete complexes with multi-step coloration is still a challenge in the field of electron transfer photochromic materials. Herein, we synthesized a series of dinuclear Ln-diphosphonate compounds[Ln=Dy(1); Gd(2); Tb(3); Y(4)] with a remarkably and reversibly photoactive coloration phenomenon. These compounds showed two-step coloration behavior, which were the first discrete architectures in the reported electron transfer photochromic complexes. This two-step coloration phenomenon was originated from the large distortion of H3-TPT acceptors, which in turn reduced the π-conjugation of electron acceptors and slowed the decay process of electron transfer. The photogenerated stable doublet radicals originated from electron transfer from diphosphonate donor to polypyridine acceptor in these complexes were detected by UV-Vis and electron spin resonance(ESR) spectra. Furthermore, the photogenerated radicals were estimated by direct current magnetic susceptibilities and variable temperature ESR spectra, suggesting the doublet radicals in the dinuclear structure for all the compounds. This work revealed a series of discrete phosphonate-based systems with a multi-step coloration process, providing a new pathway for designing multicolor photochromic materials with potential photoswitching or other applications.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Nos.21901133, 91856124, 22035003, 91961114, 21871039) and China National Postdoctoral Program for Innovative Talents(No. BX20180147).
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Hu, JX., Zhang, Q., Xia, B. et al. Photo Switchable Two-step Photochromism in a Series of Ln-Phosphonate(Ln=Dy, Gd, Tb, Y) Dinuclear Complexes. Chem. Res. Chin. Univ. 38, 58–66 (2022). https://doi.org/10.1007/s40242-021-1373-2
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DOI: https://doi.org/10.1007/s40242-021-1373-2