A near-infrared (NIR) light induced controlled cationic polymerization is presented here. The halide abstraction reaction between the cyclopentadienyl iron dicarbonyl dimer (Fe₂(Cp)₂(CO)₄) and an organic halide is utilized to generate initial radicals or cations under mild conditions, which can be further combined with both radical and cationic reversible addition–fragmentation chain transfer (RAFT) polymerization. Well-defined poly(vinyl ether)s and polyacrylates are prepared successfully under NIR light by this method. The excellent penetration ability of NIR light through thick barriers has been verified by polymerization in the presence of an A4 paper. In addition, iron-based radical polymerization has been used for three-dimensional (3D) printing to fabricate materials with different thicknesses.

中文翻译：

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铁配合物催化近红外光诱导的阳离子和自由基RAFT聚合

本文介绍了近红外（NIR）光诱导的受控阳离子聚合。环戊二烯基铁二羰基二聚体（Fe ₂（Cp）₂（CO）₄），然后在温和的条件下利用有机卤化物生成初始自由基或阳离子，然后将其与自由基和阳离子可逆加成-断裂链转移（RAFT）聚合进一步结合。通过这种方法，可以在近红外光下成功地制备出定义明确的聚乙烯醚和聚丙烯酸酯。通过在A4纸的存在下进行聚合，已验证了NIR光通过厚壁垒的出色穿透能力。此外，铁基自由基聚合已用于三维（3D）打印，以制造具有不同厚度的材料。