Priyadarshani Nilusha, Liang Yannan, Suriboot Jakkrit, Bazzi Hassan S, Bergbreiter David E
Department of Chemistry, Texas A&M University, College Station, Texas, 77842-3012, United States.
Department of Chemistry, Texas A&M University at Qatar, P.O. Box 23874, Doha, Qatar.
ACS Macro Lett. 2013 Jul 16;2(7):571-574. doi: 10.1021/mz400232y. Epub 2013 Jun 11.
Polyisobutylene (PIB)-bound ruthenium bipyridine [Ru(PIB-bpy)] metal complexes were prepared from PIB ligands formed by alkylation of 4,4'-dimethylbipyridine with polyisobutylene bromide. The product Ru(PIB-bpy)Cl complexes with at least one PIB ligand per bipyridine unit function as soluble recyclable photoredox catalysts in free radical polymerization of acrylate monomers under visible light irradiation at 25 °C with ethyl 2-bromoisobutyrate as the initiator in the presence of diisopropylethylamine. The polyacrylate products contained only about 1 ppm Ru contamination. This PIB-bound catalyst was recyclable and showed about 50-fold less Ru leaching as compared to Ru leaching in a polymerization catalyzed by the low molecular weight Ru catalyst, Ru(bpy)(PF).
聚异丁烯（PIB）键合的钌联吡啶[Ru(PIB-bpy)]金属配合物由4,4'-二甲基联吡啶与聚异丁烯溴进行烷基化反应形成的PIB配体制备而成。产物Ru(PIB-bpy)Cl配合物中每个联吡啶单元至少含有一个PIB配体，在25℃可见光照射下，以2-溴异丁酸乙酯为引发剂，在二异丙基乙胺存在的条件下，可作为可溶解的可回收光氧化还原催化剂用于丙烯酸酯单体的自由基聚合反应。聚丙烯酸酯产物中仅含有约1 ppm的Ru杂质。这种PIB键合的催化剂可回收利用，与低分子量Ru催化剂Ru(bpy)(PF)催化的聚合反应相比，其Ru浸出量减少了约50倍。
