Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1264, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molstruc.2022.133238
Keywords
Palladium(II) complexes; Square planar geometry; Vinyl-addition polymerization; Poly(norbornene); Syndiotactic poly(methyl methacrylate)
Categories
Funding
- National Research Foundation (NRF) of South Korea - Ministry of Education, Science, and Technology (MEST) [2019R1A2C1088654, 2020R1A6A3A0110019412]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20011123]
- Korea Evaluation Institute of Indus-trial Technology (KEIT)
- Ministry of Trade, Industry & Energy (MOTIE, Republic of Korea)
- MSIP
- POSTECH
- Korea Evaluation Institute of Industrial Technology (KEIT) [20011123] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A series of Pd(II) complexes bearing N,N-bidentate aminomethylpyridine and aminomethylquinoline derivatives were synthesized and characterized. The complexes showed significant catalytic activities towards the addition polymerization of norbornene and methyl methacrylate in the presence of modified methylaluminoxane (MMAO). Complex 3 with quinoline/piperidine functionalities exhibited the highest catalytic activity and produced high molecular weight polymers.
A series of Pd(II) complexes, 1-4 bearing N,N-bidentate aminomethylpyridine and aminomethylquinoline derivatives were synthesized and characterized. Single crystal X-ray diffraction analysis demonstrated that tetra-coordinated Pd(II) complexes adopted distorted square planar geometries around the metal center. In the presence of modified methylaluminoxane (MMAO) as a co-catalyst, Pd(II) complexes 1-4 exhibited significant activities (up to 43.2 x 10(5) g(PNB) mol Pd-1 h(-1)) towards the addition polymerization of norbornene (NB) at 25 degrees C. Insoluble poly(norbornene) (PNB) was obtained by all the tested catalytic systems, i.e., 1-4/MMAO. The catalytic capabilities of synthesized Pd(II) complexes were also tested towards methyl methacrylate (MMA) in the presence of modified methyl aluminoxane MMAO. Complex 3 with quinoline/piperidine functionalities showed the highest catalytic activity of 8.83 x 10(4) g(PMMA) mol Pd-1 h(-1) at 60 degrees C and resulted in high molecular weight PMMA (M-w = 2.16 x 10(6) g mol(-1)). All the complexes yielded syndiotactic poly(methyl methacrylate) (PMMA) (rr = 0.70). Notably, the steric bulk and electronic properties of the ligand framework affect their activities towards NB and MMA polymerizations, whereas, for PMMA, the stereoselectivities remained unaffected. (C) 2022 Elsevier B.V. All rights reserved.
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