Two d-f heterodinuclear cryptates Eu(Ⅲ)-M(Ⅱ)(M=Zn 2+, Ni 2+) were synthesized and characterized by elemental analysis, IR and ES-MS. The fluorescence properties of the cyptates in acetonitrile solution show that inc...Two d-f heterodinuclear cryptates Eu(Ⅲ)-M(Ⅱ)(M=Zn 2+, Ni 2+) were synthesized and characterized by elemental analysis, IR and ES-MS. The fluorescence properties of the cyptates in acetonitrile solution show that inclusion of Zn 2+ in the mononuclear europium(Ⅲ) cryptate increases the energy transfer between cryptand and europium(Ⅲ) ion, while the inclusion of Ni 2+ in the cavity quenches the fluorescence of Eu(Ⅲ) cryptate.展开更多
Emission tunable d-f transition lanthanide complexes have wide applications in many fields such as lighting and photoredox catalysis.Compared with Ce(Ⅲ)and Eu(Ⅱ)complexes,which have achieved near-unity photoluminesc...Emission tunable d-f transition lanthanide complexes have wide applications in many fields such as lighting and photoredox catalysis.Compared with Ce(Ⅲ)and Eu(Ⅱ)complexes,which have achieved near-unity photoluminescence quantum yields(PLQYs),Yb(Ⅱ)complexes still suffer from low reported PLQYs not exceeding 10%.In this work,two luminescent Yb(Ⅱ)-containing azacryptates YbI_(2)-N8M6(N8M6=4,7,13,16,21,24-hexamethyl-1,4,7,10,13,16,21,24-octaazabicyclo[8.8.8]hexacosane)and YbI2-N8E6(N8E6=4,7,13,16,21,24-hexaethyl-1,4,7,10,13,16,21,24-octaazabicyclo[8.8.8]hexacosane)were synthesized and characterized.YbI2-N8M6 in solid powder exhibits blue emission with a maximum emission wavelength(λm)of 464 nm and a PLQY of 76%,while YbI_(2)-N8E6 in solid powder exhibits green emission with a λ_(m) of 537 nm and a PLQY up to93%.Moreover,YbI_(2)-N8M6 exhibits mechanochromic property,showing an emission color change from deep-blue to cyan under mechanical grinding.These results will inspire the studies about luminescent Yb(Ⅱ)complexes and their further applications.展开更多
文摘Two d-f heterodinuclear cryptates Eu(Ⅲ)-M(Ⅱ)(M=Zn 2+, Ni 2+) were synthesized and characterized by elemental analysis, IR and ES-MS. The fluorescence properties of the cyptates in acetonitrile solution show that inclusion of Zn 2+ in the mononuclear europium(Ⅲ) cryptate increases the energy transfer between cryptand and europium(Ⅲ) ion, while the inclusion of Ni 2+ in the cavity quenches the fluorescence of Eu(Ⅲ) cryptate.
基金supported by the National Natural Science Foundation of China(22071003,92156016,21621061)the National Key R&D Program of China(2021YFB3501800)Beijing Natural Science Foundation(2202015)。
文摘Emission tunable d-f transition lanthanide complexes have wide applications in many fields such as lighting and photoredox catalysis.Compared with Ce(Ⅲ)and Eu(Ⅱ)complexes,which have achieved near-unity photoluminescence quantum yields(PLQYs),Yb(Ⅱ)complexes still suffer from low reported PLQYs not exceeding 10%.In this work,two luminescent Yb(Ⅱ)-containing azacryptates YbI_(2)-N8M6(N8M6=4,7,13,16,21,24-hexamethyl-1,4,7,10,13,16,21,24-octaazabicyclo[8.8.8]hexacosane)and YbI2-N8E6(N8E6=4,7,13,16,21,24-hexaethyl-1,4,7,10,13,16,21,24-octaazabicyclo[8.8.8]hexacosane)were synthesized and characterized.YbI2-N8M6 in solid powder exhibits blue emission with a maximum emission wavelength(λm)of 464 nm and a PLQY of 76%,while YbI_(2)-N8E6 in solid powder exhibits green emission with a λ_(m) of 537 nm and a PLQY up to93%.Moreover,YbI_(2)-N8M6 exhibits mechanochromic property,showing an emission color change from deep-blue to cyan under mechanical grinding.These results will inspire the studies about luminescent Yb(Ⅱ)complexes and their further applications.
