A novel water-soluble luminescent complex consisting of Eu(ally-dbm)3-2Tppo and poly(N-isopropyl acrylamide)(PNIPAM)is synthesized through a series of chemical reactions.The structure of the complex is characterized b...A novel water-soluble luminescent complex consisting of Eu(ally-dbm)3-2Tppo and poly(N-isopropyl acrylamide)(PNIPAM)is synthesized through a series of chemical reactions.The structure of the complex is characterized by TGA,GPC,HNMR,and the thermal-responsive uorescence of the complex in aqueous solution is investigated.It is found that PNIPAM collapse above the lower critical solution temperature causes the coordination bond breaking,leading to weakening of the uorescence from Eu3+and enhancing of the uorescence from the ligands.When temperature decreases,the uorescence from Eu3+is found to boost up and the uorescence from ligands weakens accordingly.It is deduced from this phenomenon that the ligands recoordinate with europium ions again along with the temperature decreasing,which is further confirmed by IR measurements.This thermal-responsive uorescence is of reversibility,which can be used as molecular probes for biological imaging and collapse studying of PNIPAM.展开更多
Photoinduced reversible liquefaction and solidification of polymers enable processing and healing of polymers with light.Some azobenzene-containing polymers(azopolymers)exhibit two types of photoinduced liquefaction p...Photoinduced reversible liquefaction and solidification of polymers enable processing and healing of polymers with light.Some azobenzene-containing polymers(azopolymers)exhibit two types of photoinduced liquefaction properties:photoinduced reversible solid-to-liquid transition and directional photofluidization.For the first type,light switches the glass transition temperature(T_(g))values of azopolymers and induces reversible solid-to-liquid transitions.For the second type,polarized light guides solid azopolymers to flow along the polarization direction.Here,we compare the two types of photoliquefaction and discuss their mechanisms.Recent progresses and applications based on photoliquefaction of azopolymers are also highlighted.展开更多
基金supported by the National Natural Science Foundation of China (No.51673178,No.51273186, No.21574120,and No.11404087)the Basic Research Fund for the Central Universities (WK2060200012)+1 种基金the Science and Technological Fund of Anhui Province for Outstanding Youth (No.1608085J01)the Fundamental Research Funds for the Central Universities, China Postdoctoral Science Foundation (No.2015M571918 and No.2017T100442)
文摘A novel water-soluble luminescent complex consisting of Eu(ally-dbm)3-2Tppo and poly(N-isopropyl acrylamide)(PNIPAM)is synthesized through a series of chemical reactions.The structure of the complex is characterized by TGA,GPC,HNMR,and the thermal-responsive uorescence of the complex in aqueous solution is investigated.It is found that PNIPAM collapse above the lower critical solution temperature causes the coordination bond breaking,leading to weakening of the uorescence from Eu3+and enhancing of the uorescence from the ligands.When temperature decreases,the uorescence from Eu3+is found to boost up and the uorescence from ligands weakens accordingly.It is deduced from this phenomenon that the ligands recoordinate with europium ions again along with the temperature decreasing,which is further confirmed by IR measurements.This thermal-responsive uorescence is of reversibility,which can be used as molecular probes for biological imaging and collapse studying of PNIPAM.
基金supported by the National Natural Science Foundation of China(No.51973204)the Thousand Talents Plan and Anhui Provincial Natural Science Foundation(No.1908085MB38).
文摘Photoinduced reversible liquefaction and solidification of polymers enable processing and healing of polymers with light.Some azobenzene-containing polymers(azopolymers)exhibit two types of photoinduced liquefaction properties:photoinduced reversible solid-to-liquid transition and directional photofluidization.For the first type,light switches the glass transition temperature(T_(g))values of azopolymers and induces reversible solid-to-liquid transitions.For the second type,polarized light guides solid azopolymers to flow along the polarization direction.Here,we compare the two types of photoliquefaction and discuss their mechanisms.Recent progresses and applications based on photoliquefaction of azopolymers are also highlighted.
