Catalytic performance of tridentate versus bidentate Co(ii) complexes supported by Schiff base ligands in vinyl addition polymerization of norbornene

Kyeonghun Kim, Saira Nayab, Yerim Cho, Hyewon Jung, Hyeonuk Yeo, Hyosun Lee, Sang Ho Lee

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

A series of Co(ii) complexes supported by Schiff base ligands, LA-LC, where LA, LB, and LC are (E)-3-methoxy-N-(quinolin-2-ylmethylene)propan-1-amine, (E)-N1,N1-dimethyl-N2-(pyridin-2-ylmethylene)ethane-1,2-diamine, and (E)-N1,N1-dimethyl-N2-(thiophen-2-ylmethylene)ethane-1,2-diamine, respectively, were designed and synthesized. Structural studies revealed a distorted trigonal bipyramidal geometry for [LBCoCl2] and a distorted tetrahedral geometry for [LCCoCl2]. After activation with modified methyl aluminoxane (MMAO), all the Co(ii) complexes catalyzed the polymerization of norbornene (NB) to yield vinyl-type polynorbornenes (PNBs) with activities of up to 4.69 × 104 gPNB mol Co−1 h−1 at 25 °C. High-molecular-weight (Mn of up to 1.71 × 105 g mol−1) soluble PNBs with moderate molecular-weight distributions (MWD) were obtained. The activity of the Co(ii)/MMAO catalytic system is influenced by the steric hindrance and electronic properties of the ligands.

Original languageEnglish
Pages (from-to)35896-35904
Number of pages9
JournalRSC Advances
Volume12
Issue number55
DOIs
StatePublished - 21 Dec 2022

Fingerprint

Dive into the research topics of 'Catalytic performance of tridentate versus bidentate Co(ii) complexes supported by Schiff base ligands in vinyl addition polymerization of norbornene'. Together they form a unique fingerprint.

Cite this