Alternating copolymerization of carbon dioxide and propylene oxide by single-component cobalt salen complexes with various axial group

✍ Scribed by Binyuan Liu; Xin Zhao; Hongfei Guo; Yanhao Gao; Min Yang; Xianhong Wang

• Book ID: 104088011
• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 368 KB
• Volume: 50
• Category: Article
• ISSN: 0032-3861
• DOI: 10.1016/j.polymer.2009.08.034

✦ Synopsis

A series of single-component cobalt salen complexes, N,N 0 -bis(salicylidene)-1,2phenylenediamino cobaltIII X (X ¼ Cl (1a), Br (1b), NO3 (1c), CF3COO (1d), BF4 (1e), and N3 (1f)) (SalphCoX), were prepared for alternating copolymerization of carbon dioxide and propylene oxide(PO) under mild condition. The axial anion X group of the SalenphCoX played important role in tailoring the catalytic activity, polymeric/ cyclic carbonate selectivity, as well as stereochemistry of carbonate unit sequence in the polymer chain. SalenphCoX with an electron-withdrawing axial X group (complex 1c) was an ideal catalyst for the copolymerization of CO2 and PO to selectively produce polycarbonate with w99% carbonate linkage and over 81% head-to-tail structure.