New fluorochromic materials that reversibly change their emission properties in response to their environment are of interest for the development of sensors and light‐emitting materials. A new design of Eu‐containing polymer hydrogels showing fast self‐healing and tunable fluorochromic properties in response to five different stimuli, including pH, temperature, metal ions, sonication, and force, is reported. The polymer hydrogels are fabricated using Eu–iminodiacetate (IDA) coordination in a hydrophilic poly(N,N‐dimethylacrylamide) matrix. Dynamic metal–ligand coordination allows reversible formation and disruption of hydrogel networks under various stimuli which makes hydrogels self‐healable and injectable. Such hydrogels show interesting switchable ON/OFF luminescence along with the sol–gel transition through the reversible formation and dissociation of Eu–IDA complexes upon various stimuli. It is demonstrated that Eu‐containing hydrogels display fast and reversible mechanochromic response as well in hydrogels having interpenetrating polymer network. Those multistimuli responsive fluorochromic hydrogels illustrate a new pathway to make smart optical materials, particularly for biological sensors where multistimuli response is required.

中文翻译：

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Eu-亚氨基二乙酸酯的动态配位控制聚合物水凝胶对多种刺激的荧光致变色反应

响应于环境可逆地改变其发射特性的新型氟铬材料对于传感器和发光材料的开发很重要。报道了一种新的含Eu聚合物水凝胶的设计，该凝胶在响应五种不同的刺激（包括pH值，温度，金属离子，超声处理和作用力）时显示出快速的自愈和可调节的荧光致变色特性。聚合物水凝胶是在亲水性聚（N，N）中使用Eu-亚氨基二乙酸酯（IDA）配位制备的‐二甲基丙烯酰胺）基质。动态的金属-配体配位允许在各种刺激下可逆地形成和破坏水凝胶网络，从而使水凝胶可自我修复和注射。这种水凝胶在各种刺激下通过可逆的Eu-IDA复合物的形成和解离显示出有趣的可切换ON / OFF发光以及溶胶-凝胶转变。已证明含Eu的水凝胶在具有互穿聚合物网络的水凝胶中也显示出快速且可逆的机械变色响应。那些对多刺激响应的荧光变色水凝胶说明了制造智能光学材料的新途径，特别是对于需要多刺激响应的生物传感器而言。