Researchers from China have designed coordination frameworks which exhibit varing levels of luminescence when exposed to air of different humidities.
The porous terbium-based metal organic framework reversibly absorbs/desorbs water molecules into its structure. When additonal water molecules are coordinated to the framework, the compound emits a bright green colour (easily detectable by the naked eye) – the result of a reduced O-H vibrational quenching in the complex.
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Luminescent humidity sensors based on porous Ln3+-MOFs
Yang Yu, Jiang-Ping Ma and Yu-Bin Dong
