Thermal control over phosphorescence or thermally activated delayed fluorescence in a metal-organic framework

By integrating a tailor-made donor-acceptor (D-A) ligand in a metal-organic framework (MOF), a material with unprecedented features emerges. The ligand combines a pair of cyano groups as acceptors with four sulfanylphenyls as donors, which expose each a carboxylic acid as coordination sites. Upon tr...

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Bibliographic Details
Published in:Chemical science (Cambridge) 2024-06, Vol.15 (23), p.895-8912
Main Authors: Sun, Huili, Zhang, Qiangsheng, Meng, Liuli, Wang, Zhonghao, Fan, Yanan, Mayor, Marcel, Pan, Mei, Su, Cheng-Yong
Format: Article
Language:English
Subjects:
Ammonia
Carboxylic acids
Chemistry
Cyano groups
Emission
Ligands
Metal-organic frameworks
Near infrared radiation
Phosphorescence
Photon absorption
Photons
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Summary:By integrating a tailor-made donor-acceptor (D-A) ligand in a metal-organic framework (MOF), a material with unprecedented features emerges. The ligand combines a pair of cyano groups as acceptors with four sulfanylphenyls as donors, which expose each a carboxylic acid as coordination sites. Upon treatment with zinc nitrate in a solvothermal synthesis, the MOF is obtained. The new material combines temperature-assisted reverse intersystem crossing (RISC) and intersystem crossing (ISC). As these two mechanisms are active in different temperature windows, thermal switching between their characteristic emission wavelengths is observed for this material. The two mechanisms can be activated by both, one-photon absorption (OPA) and two-photon absorption (TPA) resulting in a large excitement window ranging from ultraviolet (UV) over visible light (VL) to near infrared (NIR). Furthermore, the emission features of the material are pH sensitive, such that its application potential is demonstrated in a first ammonia sensor. By integrating a tailor-made donor-acceptor (D-A) ligand in a metal-organic framework (MOF), a material with unprecedented features emerges.
ISSN:2041-6520
2041-6539
DOI:10.1039/d4sc02030h