【作者】 鹿洁； 郭永先； 于丽；

【Author】 Jie lu;Yongxian Guo;Li Yu;Key Laboratory of Colloid and Interface Chemistry,Shandong University,Ministry of Education;

【机构】 山东大学； 山东大学胶体与界面化学教育部重点实验室；

【摘要】 智能材料由于在药物释放、传感器、探针以及记忆存储材料等领域具有良好的应用前景而受到了广泛关注,但是目前构筑具有多重刺激响应的智能材料依然富有挑战性。本文通过离子自组装策略,采用阳离子表面活性剂C₂H₅-azobenzene-OC₆H₁₂-N+（CH₃）₃Br^-（ETAB）与多金属氧酸盐在水溶液中制备了超分子纳米结构。通过核磁共振波谱、傅里叶变换红外光谱、小角X射线散射和紫外可见吸收光谱等技术探究了其组装机理及对外界刺激的响应。发现ETAB与Keggin构型的磷钨酸对紫外光有明显的响应,主要原因是ETAB分子在紫外光照下由反式结构变成顺式结构;而含稀土Eu的多金属氧酸盐（Eu-POM）和ETAB构筑的超分子材料不仅对紫外光有响应,同时还对pH和Cu²⁺有响应,后两种响应是由于分别形成了氢键和配位键所导致。基于该超分子材料的多重刺激响应的性质,有望在紫外光检测、光学存储和化学传感器等领域有一定的应用。更多还原

【Abstract】 in the fields of drug delivery,sensors,probes and memory storage devices,etc.However,so far fabrication of multi-stimuli responsive materials still presents some challenges.Here we demonstrated supramolecular materials fabricated by a cationic surfactant,4-ethyl-4′-（trimethylaminohexyloxy） azobenzene bromide（ETAB）,and anionic polyoxometalates（POM）,based on an ionic self-assembly（ISA） strategy.The mechanism of assembly and the response of external stimuli were investigated by NMR,Fourier transform infrared（FTIR）,small angle X-ray scattering（SAXS） and UV/vis techniques.Supramolecular materials prepared in aqueous solution by ETAB and Keggin type polyoxometalate（POM） show obvious response to UV irradiation,due to the transformation of ETAB from trans-to cis-isomers after exposure to UV light.In comparison to ETAB/POM,as-prepared supramolecular materials by using Eu-containing polyoxometalate（Eu-POM） and ETAB,were not only found to have excellent responsive properties to UV light,but also exhibit responses to solution pH and additional Cu²⁺.Strong hydrogen-bond among Eu-POM,H⁺,and H₂O and coordination interaction between Cu²⁺ and Oc were confirmed to be responsible for the latter two responses.The supramolecular materials with multiple stimuli responses have potentials in some fields,e.g.UV detection,sensor and optical storage.更多还原