A tripodal heptadentate Schiff base as an active ligand for atom transfer radical polymerization,Polymer Chemistry

当前位置： X-MOL 学术 › Polym. Chem. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

A tripodal heptadentate Schiff base as an active ligand for atom transfer radical polymerization
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020-09-09 , DOI: 10.1039/d0py01022g
Xiaoling Xu _{1,

2,

3,

4,

5} , Chunyang Bao _{1,

2,

3,

4,

5} , Mei Hong _{1,

2,

3,

4,

5} , Die Li _{1,

2,

3,

4,

5} , Qiang Zhang _{1,

2,

3,

4,

5}

Affiliation

The use of a tripodal heptadentate Schiff base, tris[N-(2-pyridylmethyl)-2-iminoethyl]amine (Py₃Tren), as an active ligand for atom transfer radical polymerization (ATRP) is reported. The coordination between Py₃Tren and CuBr₂ in solution is investigated by electrospray ionization mass spectrometry, which reveals the generation of a tripod claw-shaped complex by using equimolar quantities of CuBr₂ and Py₃Tren. Electrochemical studies of CuBr₂/Py₃Tren complexes demonstrate more negative redox potentials and higher activities compared with those of bidentate CuBr₂/N-ethyl-2-pyridylmethanimine (PyEthyl) complexes. Subsequently, CuBr/Py₃Tren is employed as a catalyst for the normal ATRP of methyl methacrylate (MMA). Well-defined poly(MMA) with controlled molecular weight and narrow polydispersity could be synthesized with high conversions and fast rates even at ambient temperature (30 °C). Activators regenerated by electron transfer (ARGET) ATRP and supplemental activators and reducing agents (SARA) ATRP of acrylate monomers using Py₃Tren as the ligand are also performed to reduce the amounts of metal catalysts for polymerizations.

中文翻译：

三脚架七齿席夫碱作为原子转移自由基聚合的活性配体

据报道，使用三脚架七齿席夫碱，三[ N-（2-吡啶基甲基）-2-亚氨基乙基]胺（Py ₃ Tren）作为原子转移自由基聚合（ATRP）的活性配体。通过电喷雾电离质谱法研究了溶液中Py ₃ Tren与CuBr ₂的配位，揭示了通过使用等摩尔量的CuBr ₂和Py ₃ Tren生成三脚形爪状复合物。CuBr ₂ / Py ₃ Tren配合物的电化学研究表明，与二齿CuBr ₂ / N相比，负氧化还原电位更高，活性更高-乙基-2-吡啶基甲亚胺（PyEthyl）配合物。随后，将CuBr / Py ₃ Tren用作甲基丙烯酸甲酯（MMA）常规ATRP的催化剂。即使在环境温度（30°C）下，也可以以高的转化率和较快的速率合成分子量可控且多分散度窄的定义明确的聚（MMA）。还进行了通过电子转移（ARGET）ATRP再生的活化剂以及使用Py ₃ Tren作为配体的丙烯酸酯单体的补充活化剂和还原剂（SARA）ATRP的再生，以减少用于聚合反应的金属催化剂的量。

更新日期：2020-10-13

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11