A novel Eu(III)metal–organic framework(MOF)featuring 3-fold interpenetration shows multi-responsive behaviors owing to the combination of charge transfer,electron transfer,and energy transfer between different ingred...A novel Eu(III)metal–organic framework(MOF)featuring 3-fold interpenetration shows multi-responsive behaviors owing to the combination of charge transfer,electron transfer,and energy transfer between different ingredients(the electron-deficient tris(pyridinium)triazine(tpt)chromophore,the electron-rich naphthalene chromophore,the Eu(III)luminophore,and the vip anion).The interframework naphthalene-to-tpt charge transfer dictated by framework interpenetration serves to sensitize the Eu(III)emission through energy transfer.The photoinduced host–vip electron transfer from the intrinsic chloride vip to tpt leads to photochromism and photoquenching of photoluminescence.The spontaneous host–vip electron transfer from extrinsic amine/ammonia to tpt allow chromic and luminescent response to ammonia and amines with size selectivity.Furthermore,the photogenerated phase shows sensitive color change and luminescence turn-on upon exposure to O2.The multi-responsive properties offer the appeal for optical switching and sensing use.The qualitative and quantitative gaseous sensing of ammonia and O2 has been demonstrated with portable and reusable MOF–polymer membranes.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.21971069 and 21773070).
文摘A novel Eu(III)metal–organic framework(MOF)featuring 3-fold interpenetration shows multi-responsive behaviors owing to the combination of charge transfer,electron transfer,and energy transfer between different ingredients(the electron-deficient tris(pyridinium)triazine(tpt)chromophore,the electron-rich naphthalene chromophore,the Eu(III)luminophore,and the vip anion).The interframework naphthalene-to-tpt charge transfer dictated by framework interpenetration serves to sensitize the Eu(III)emission through energy transfer.The photoinduced host–vip electron transfer from the intrinsic chloride vip to tpt leads to photochromism and photoquenching of photoluminescence.The spontaneous host–vip electron transfer from extrinsic amine/ammonia to tpt allow chromic and luminescent response to ammonia and amines with size selectivity.Furthermore,the photogenerated phase shows sensitive color change and luminescence turn-on upon exposure to O2.The multi-responsive properties offer the appeal for optical switching and sensing use.The qualitative and quantitative gaseous sensing of ammonia and O2 has been demonstrated with portable and reusable MOF–polymer membranes.
