The development of nonconventional luminescent heterochain polymers with unique structures and attractive stimuli-responsive degradation properties has gained great attention in recent years. In this work, a series of nonconventional luminescent heterochain polymers with diverse structures, excellent solubility, and high relative molecular weights (M_w up to 89,000 g/mol) were facilely synthesized in good yields (up to 90%) using a novel one-pot four-component polymerization tool in air at room temperature within merely 1 h. The presence of abundant C═N bonds in both the backbones and side pendants of these poly(N-sulfonylamidine)s endowed them with excellent hydrolytic degradability under acidic conditions at room temperature. The polymer could be further transformed into a well-defined poly(N-sulfonylamide) structure within 10 h. Benefiting from the heteroatom-rich characteristics, the prepared polyamidines and polyamides exhibited bright solid-state fluorescence despite the absence of conventional luminophores with large π-conjugation or the influence of aggregation-caused quenching units. The polymer solid powders generally showed excitation-dependent fluorescence due to the clusterization-triggered emission mechanism. Furthermore, the nonconventional luminescent polymer films exhibited obvious and reversible fluorescence changes in response to acid vapors, which makes them potential fluorescent sensing materials for the detection or early warning of the leakage of volatile acids.

中文翻译：

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一锅法四组分合成具有非常规发光功能的酸响应性可降解杂链聚合物


近年来，具有独特结构和有吸引力的刺激响应降解性能的非常规发光杂链聚合物的开发引起了人们的广泛关注。在这项工作中，我们以良好的收率（高达90%）轻松合成了一系列结构多样、溶解性优异、相对分子量高（M _w 高达 89,000 g/mol）的非常规发光杂链聚合物。 ）在室温空气中使用新型一锅四组分聚合工具仅需 1 小时即可完成。这些聚(N-磺酰脒)的主链和侧链中存在丰富的C=N键，赋予它们在室温酸性条件下优异的水解降解性。该聚合物可以在10小时内进一步转化为明确的聚(N-磺酰胺)结构。得益于富含杂原子的特性，所制备的聚脒和聚酰胺尽管不存在具有大π共轭的常规发光团或聚集引起的猝灭单元的影响，但仍表现出明亮的固态荧光。由于簇化触发的发射机制，聚合物固体粉末通常表现出激发依赖性荧光。此外，非常规发光聚合物薄膜响应酸蒸气表现出明显且可逆的荧光变化，这使得它们成为用于检测或预警挥发性酸泄漏的潜在荧光传感材料。