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Photochromic and photomodulated luminescence properties of two metal–viologen complexes constructed by a tetracarboxylate-anchored bipyridinium-based ligand

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Abstract

In this study, two metal–viologen complexes, formulated as [Cd1.5(H2L)0.5(Cl)3(CH3OH)]n (1) and [Eu2(L)(NO3)4(HOCH2CH2OH)2]n (2), were constructed by a tetracarboxylate anchored bipyridinium-based ligand 1,1′-bis(3,5-dicarboxybenzyl)-4,4′-bipyridinium dichloride (H4L·Cl2). Single-crystal X-ray analyses revealed that complex 1 featured a 2D-layered structure, while complex 2 showed a 1D “ladder-like” chain structure. The difference in the central metal ions, anions, solvent molecules, deprotonation degree of the tetracarboxylate ligand, coordination modes and conformations of the ligand have a great influence on the final structure. As expected, incorporation of the viologen moiety to the frameworks led to the predefined photochromism: when samples 1 and 2 were exposed to UV-visible light, a reversible color change from light yellow to blue/dark blue occurred. Moreover, complex 2 exhibited the characteristic emission of Eu(III) ion in the visible region, and it also displayed an interesting reversible tunable photo-induced luminescence switching behavior: under the irradiation of UV-vis light, the luminescence emission intensity of complex 2 gradually decreased and reached 15% of the starting value after 8 min. These results may not only help to further understand the structure–photoresponse relationships of viologen-based MOFs, but also help to guide the design and synthesis of luminescent materials with photo-modulated switching ability.

Graphical abstract: Photochromic and photomodulated luminescence properties of two metal–viologen complexes constructed by a tetracarboxylate-anchored bipyridinium-based ligand

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Publication details

The article was received on 09 Aug 2018, accepted on 31 Aug 2018 and first published on 03 Sep 2018


Article type: Paper
DOI: 10.1039/C8CE01335G
Citation: CrystEngComm, 2018, Advance Article
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    Photochromic and photomodulated luminescence properties of two metal–viologen complexes constructed by a tetracarboxylate-anchored bipyridinium-based ligand

    L. Li, H. Li, T. Li, L. Quan, J. Xu, F. Li and S. Zang, CrystEngComm, 2018, Advance Article , DOI: 10.1039/C8CE01335G

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