Precision Synthesis of n-Type 蟺-Conjugated Polymers in Catalyst-Transfer Condensation Polymerization

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• 作者：Tsutomu Yokozawa ; Yutaka Nanashima ; Yoshihiro Ohta
• 刊名：ACS Macro Letters
• 出版年：2012
• 出版时间：July 17, 2012
• 年：2012
• 卷：1
• 期：7
• 页码：862-866
• 全文大小：271K
• 年卷期：v.1,no.7(July 17, 2012)
• ISSN：2161-1653

文摘

Recent developments in catalyst-transfer condensation polymerization, which proceeds in a chain-growth polymerization manner, have made it possible to synthesize well-defined 蟺-conjugated polymers with controlled molecular weight and low polydispersity, as well as block copolymers and gradient copolymers. However, catalyst-transfer condensation polymerization has been limited to the polymerization of donor monomers (such as thiophene) for the synthesis of p-type 蟺-conjugated polymers. Here, we highlight several recent advances in catalyst-transfer condensation polymerization leading to n-type 蟺-conjugated polymers. The Kumada鈥揟amao coupling polymerization of Grignard pyridine monomers yields well-defined poly(pyridine-3,5-diyl) and poly(pyridine-2,5-diyl) with a broad molecular weight distribution. Monomers consisting of strong acceptor and weak donor moieties also undergo catalyst-transfer polymerization; well-defined poly(fluorene benzothiaziazole) was obtained by Suzuki鈥揗iyaura coupling polymerization and poly(bithiophene naphthalene diimide) was obtained by an unusual Ni-catalyzed coupling polymerization of an anion radical generated from a bromothiophene naphathalene diimide bromothiophene monomer and activated zinc.