We developed linear and zigzag-type polymers consisting of fused-boron ketoiminates having not only efficient emission in multiple states, such as in solution and film, but also stimuli-responsive luminochromic properties. In the previous research, we found that highly efficient multi-state luminescence can be obtained through modification of the aggregation-induced emission-active boron complexes by introducing a ring fusion. Based on this result, we designed alternating copolymers containing these fused-boron ketoiminates as a monomer unit. In particular, by changing the connection point at the boron complex, the shape of the polymer chain was varied to modulate the degree of molecular interactions. The obtained polymers exhibited intense emission in both solution and film states. Interestingly, we found that one of the linear polymers presented thermochromic luminescence in solution. From the series of mechanistic analyses, it was proposed that assembly should play an important role in their stimuli-responsive luminescence color changes. Moreover, a mechanochromic luminescence property was also observed from the zigzag-type polymer in the solid state. The luminochromic behavior could originate from changes in the morphology of the conjugated polymers after grinding.

中文翻译：

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刺激响应的光致变色聚合物，由多态发射熔融稠合的酮亚胺化硼组成

我们开发了由熔融硼酮亚胺盐组成的线性和Z字形聚合物，不仅具有在溶液和薄膜等多种状态下的有效发射，而且还具有刺激响应性的光致变色特性。在先前的研究中，我们发现可以通过引入环融合来修饰聚集诱导的发射活性硼配合物来获得高效的多态发光。基于此结果，我们设计了包含这些熔融硼酮亚胺盐作为单体单元的交替共聚物。特别是，通过改变硼配合物的连接点，可以改变聚合物链的形状以调节分子相互作用的程度。所获得的聚合物在溶液和薄膜状态下均表现出强烈的发射。有趣的是 我们发现一种线性聚合物在溶液中呈现热致变色发光。从一系列的机械分析中，提出组装应在其刺激响应发光颜色变化中起重要作用。此外，还从固态的之字形聚合物观察到了机械致变色发光性能。光致变色行为可能源自研磨后共轭聚合物的形态变化。