Chromic materials with multi-stimuli responses have received tremendous attention from industry and academia for their potential applications in smart windows,data storage,military camouflage,molecular switches,modula...Chromic materials with multi-stimuli responses have received tremendous attention from industry and academia for their potential applications in smart windows,data storage,military camouflage,molecular switches,modulators,etc.To develop multi-stimuli-responsive color-changing materials with high sensi-tivity and high stability,a polyoxometalate-based copper-viologen framework,formulated as Cu_(2)(H_(2)O)_(2)(L)_(2)[PW_(12)O_(40)][OH^(-)]·2H_(2)O(HNU-97,H_(2)L^(2+)=1,10-(1,4-phenylenebis(methylene))bis(4-carboxypyridinium)),was prepared by a mild one-step self-assembly strategy.Structural analysis shows that HNU-97 presents a supramolecular structure formed by a one-dimensional copper-viologen frame-work and polyoxometalates through rich hydrogen bonds,anion-πinteractions,etc.Discoloration studies show that HNU-97 exhibits reversible and rapid response characteristics to various external stimuli,such as 10 s to UV radiation,5 min to heating,and 5 min to ammonium/amine vapors.This mechanism re-veals that different external excitation sources lead to different preferential transfer directions of electrons,resulting in different discoloration phenomena.To construct stimuli-chromic materials with good mechanical properties,we successfully introduced HNU-97 into the poly(vinyl alcohol)(PVA)/glycerol(Gly)hydrogel to obtain a composite HNU-97@PVA/Gly.Remarkably,HNU-97@PVA/Gly combines the merits of each component and can achieve signifi-cant response discoloration behavior under both UV irradiation and ammonia atmosphere.This work will provide an idea for the construction of multiple stimuli-responsive materials.展开更多
基金supported by Hainan Provincial Natural Science Foundation of China(No.524MS027)the Scientific Research Support Project of Colleges and Universities in Hainan Province(No.Hnky2024-12)+3 种基金the Innovational Fund for Scientific and Technological Personnel of Hainan Province(No.KJRC2023D32)the Research Start-up Fund of Hainan University,China(No.KYQD(ZR)23039)the National Natural Science Foundation of China(No.22361017)the Innovation Platform for Academicians of Hainan Province,and the Specific Research Fund of the Innovation Platform for Academicians of Hainan Province(No.YSPTZX202321).
文摘Chromic materials with multi-stimuli responses have received tremendous attention from industry and academia for their potential applications in smart windows,data storage,military camouflage,molecular switches,modulators,etc.To develop multi-stimuli-responsive color-changing materials with high sensi-tivity and high stability,a polyoxometalate-based copper-viologen framework,formulated as Cu_(2)(H_(2)O)_(2)(L)_(2)[PW_(12)O_(40)][OH^(-)]·2H_(2)O(HNU-97,H_(2)L^(2+)=1,10-(1,4-phenylenebis(methylene))bis(4-carboxypyridinium)),was prepared by a mild one-step self-assembly strategy.Structural analysis shows that HNU-97 presents a supramolecular structure formed by a one-dimensional copper-viologen frame-work and polyoxometalates through rich hydrogen bonds,anion-πinteractions,etc.Discoloration studies show that HNU-97 exhibits reversible and rapid response characteristics to various external stimuli,such as 10 s to UV radiation,5 min to heating,and 5 min to ammonium/amine vapors.This mechanism re-veals that different external excitation sources lead to different preferential transfer directions of electrons,resulting in different discoloration phenomena.To construct stimuli-chromic materials with good mechanical properties,we successfully introduced HNU-97 into the poly(vinyl alcohol)(PVA)/glycerol(Gly)hydrogel to obtain a composite HNU-97@PVA/Gly.Remarkably,HNU-97@PVA/Gly combines the merits of each component and can achieve signifi-cant response discoloration behavior under both UV irradiation and ammonia atmosphere.This work will provide an idea for the construction of multiple stimuli-responsive materials.
