The assembly of high-nuclearity lanthanide nanoclusters with favourable magnetocaloric effects suffers from a significant challenge.Herein,two outstanding examples of cage-shaped nanoclusters,namely,[Ln_(28)(IN)_(25)(...The assembly of high-nuclearity lanthanide nanoclusters with favourable magnetocaloric effects suffers from a significant challenge.Herein,two outstanding examples of cage-shaped nanoclusters,namely,[Ln_(28)(IN)_(25)(C_(2)O_(4))_(6)(HCOO)(μ_(3)-OH)_(36)(μ_(2)-OH)_(2)(H_(2)O)_(36)]·8Br·xH_(2)O(Ln=Gd and Eu;x=21,abbreviated as Gd_(28);x=17,abbreviated as Eu_(28),HIN=isonicotinic acid;H_(2)C_(2)O_(4)=oxalic acid)have been triumphantly designed and constructed under hydrothermal conditions.The crystallographic study revealed that the aesthetically pleasing triangle-shaped Gd_(12) subunit and Gd_(16) subunit built separately from four Gd_(3) units and four Gd_(4) units,respectively,are shaped into an unprecedented cage-shaped configuration.Prominently,six small and simple C_(2)O_(4)^(2-)anions generated via the in situ reaction of HIN are faultlessly anchored in the cage-shaped framework.Furthermore,the existence of abundant Gd^(Ⅲ) ions impart Gd_(28) with a captivating magnetic entropy change(−ΔS_(m)^(max)=37.5 J kg^(−1)K^(−1))at 2.0 K for ΔH=7.0 T.展开更多
A novel water-stable Tb-based metal–organic framework(Tb-MOF),namely{[Tb(CA)(OA)_(0.5)(H_(2)O)_(2)]·H_(2)O}_(n)(H_(2)CA=chelidonic acid;H_(2)OA=oxalic acid),was synthesized via a solvothermal method.Tb-MOF was s...A novel water-stable Tb-based metal–organic framework(Tb-MOF),namely{[Tb(CA)(OA)_(0.5)(H_(2)O)_(2)]·H_(2)O}_(n)(H_(2)CA=chelidonic acid;H_(2)OA=oxalic acid),was synthesized via a solvothermal method.Tb-MOF was studied for its highly sensitive detection towards nitrite,which is a hazardous chemical in water and food.As a luminescent sensor,Tb-MOF displays a linear detection range between 0 and 15.6μM,with a limit of detection of 28.25 nM.Dynamic quenching process was observed in this system and was studied in detail.A mechanism study revealed that the fluorescence response of Tb-MOF towards nitrite was due to the energy transfer from the sensitized Tb^(3+) ion to the nitrite.展开更多
基金supported by the Natural Science Foundation of China(Grant 92161109).
文摘The assembly of high-nuclearity lanthanide nanoclusters with favourable magnetocaloric effects suffers from a significant challenge.Herein,two outstanding examples of cage-shaped nanoclusters,namely,[Ln_(28)(IN)_(25)(C_(2)O_(4))_(6)(HCOO)(μ_(3)-OH)_(36)(μ_(2)-OH)_(2)(H_(2)O)_(36)]·8Br·xH_(2)O(Ln=Gd and Eu;x=21,abbreviated as Gd_(28);x=17,abbreviated as Eu_(28),HIN=isonicotinic acid;H_(2)C_(2)O_(4)=oxalic acid)have been triumphantly designed and constructed under hydrothermal conditions.The crystallographic study revealed that the aesthetically pleasing triangle-shaped Gd_(12) subunit and Gd_(16) subunit built separately from four Gd_(3) units and four Gd_(4) units,respectively,are shaped into an unprecedented cage-shaped configuration.Prominently,six small and simple C_(2)O_(4)^(2-)anions generated via the in situ reaction of HIN are faultlessly anchored in the cage-shaped framework.Furthermore,the existence of abundant Gd^(Ⅲ) ions impart Gd_(28) with a captivating magnetic entropy change(−ΔS_(m)^(max)=37.5 J kg^(−1)K^(−1))at 2.0 K for ΔH=7.0 T.
基金supported by the National Natural Science Foundation of China(grant numbers 21931004 and 21861130354)the Natural Science Foundation of Tianjin(18JCJQJC47200)+1 种基金the Fundamental Research Funds for the Central Universities,Nankai University(63201016 and 63201043)the Ministry of Education of China(grant number B12015).
文摘A novel water-stable Tb-based metal–organic framework(Tb-MOF),namely{[Tb(CA)(OA)_(0.5)(H_(2)O)_(2)]·H_(2)O}_(n)(H_(2)CA=chelidonic acid;H_(2)OA=oxalic acid),was synthesized via a solvothermal method.Tb-MOF was studied for its highly sensitive detection towards nitrite,which is a hazardous chemical in water and food.As a luminescent sensor,Tb-MOF displays a linear detection range between 0 and 15.6μM,with a limit of detection of 28.25 nM.Dynamic quenching process was observed in this system and was studied in detail.A mechanism study revealed that the fluorescence response of Tb-MOF towards nitrite was due to the energy transfer from the sensitized Tb^(3+) ion to the nitrite.
