Living Radical Polymerization of Acrylates Mediated by 1,3-Bis(2-pyridylimino)isoindolatocobalt(II) Complexes: Monitoring the Chain Growth at the Metal
作者:Björn K. Langlotz、Julio Lloret Fillol、Jürgen H. Gross、Hubert Wadepohl、Lutz H. Gade
DOI:10.1002/chem.200801373
日期:2008.11.17
for cobalt(II)-mediated radical polymerization is reported which is based on 1,3-bis(2-pyridylimino)isoindolate (bpi) as ancillary ligand. The modular synthesis of the bis(pyridylimino)isoindoles (bpiH) employed in this work is based on the condensation of 2-aminopyridines with phthalodinitriles. Reaction of the bpiH protio-ligands with a twofold excess of cobalt(II) acetate or cobalt(II) acetylacetonate
报道了一种新型的钴(II)介导的自由基聚合介体,它以1,3-双(2-吡啶基氨基)异吲哚酸酯(bpi)为辅助配体。在这项工作中使用的双(吡啶基吡啶基)异吲哚(bpiH)的模块合成是基于2-氨基吡啶与邻苯二腈的缩合反应。bpiH蛋白配体与两倍过量的乙酸钴(II)或乙酰丙酮钴(II)在甲醇中的反应生成[Co(bpi)(OAc)],其结晶为配位聚合物,以及一系列[Co(acac) )(bpi)(MeOH)],它们是单核八面体络合物。在高真空下将[Co(acac)(bpi)(MeOH)]化合物加热至100℃后,除去配位甲醇,得到五配位配合物[Co(acac)(bpi)]。通过使用一摩尔当量的相对短暂的自由基源2,2'-偶氮二(4-甲氧基-2,4-二甲基戊腈)(V-70)作为引发剂(单体),研究了丙烯酸甲酯在60摄氏度下的聚合反应/ catalyst / V-70:600:1:1)。乙酰胺配合物的低溶