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Misawa N, Suzuki Y, Saha S, Koga N, Nagaoka M. Theoretical Elucidation of the Effect of Counteranions on the Olefin Polymerization Activity of (Pyridylamido)Hf(IV) Catalyst by QM and REMD Studies: MeB(C6F5)3– versus B(C6F5)4–. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00698] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nana Misawa
- Graduate School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Yuichi Suzuki
- Graduate School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Soumen Saha
- Graduate School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
- Core Research for Evolutional Science and Technology, Japan Science and Technology Agency (JST-CREST), Honmachi, Kawaguchi 332-0012, Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University Katsura, Kyoto 615-8520, Japan
| | - Nobuaki Koga
- Graduate School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
- Core Research for Evolutional Science and Technology, Japan Science and Technology Agency (JST-CREST), Honmachi, Kawaguchi 332-0012, Japan
- Future Value Creation Research Center, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Masataka Nagaoka
- Graduate School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
- Core Research for Evolutional Science and Technology, Japan Science and Technology Agency (JST-CREST), Honmachi, Kawaguchi 332-0012, Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University Katsura, Kyoto 615-8520, Japan
- Future Value Creation Research Center, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
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Orimoto Y, Shirane S, Aoki Y. Extent of structural change during the reaction and its relationship to isoselectivity in polypropylene polymerization with ansa-zirconocene/borate catalyst: A computational study. J Comput Chem 2019; 40:2622-2635. [PMID: 31396976 DOI: 10.1002/jcc.26040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 07/17/2019] [Accepted: 07/20/2019] [Indexed: 11/07/2022]
Abstract
The mechanism of isotactic polypropylene (iPP) polymerization with an (R,R)-ansa-zirconocene/borate catalyst system was analyzed using quantum chemistry (QC) calculations by focusing on the extent of structural change during monomer insertion. The activation energy for migratory insertion, Ea , was compared for four possible reaction paths with regard to monomer coordination, that is, 1,2-re, 1,2-si, 2,1-si, and 2,1-re, until the seventh monomer insertion step, explicitly including a borate anion cocatalyst. This indicated that the 1,2-re path was most favorable, except for the first step, which favored 1,2-si. As far as the first step, the product of 1,2-si is a conformational isomer to that of the 1,2-re path, and the exceptional favorability of 1,2-si does not affect the isoselectivity. These results support previous studies, except that our results address the unexplored seventh insertion step with a borate anion cocatalyst by QC calculations. The isoselectivity correlated with the extent of structural change in the whole system during the reaction. It was proved from our detail analysis that the advantage of 1,2-re with a small Ea is attributed to its smaller structural changes due to low steric repulsion in the system compared with other paths. Conversely, larger repulsion in the systems involved in other paths results in larger structural changes to minimize the structural strain. However, the relaxation appears insufficient due to structural restriction of the enforced four-membered ring transition state structure. A borate anion cocatalyst broke the C2 symmetry of the electronic structures of zirconocene, resulting in an odd-even Ea frequency for the monomer insertion. Molecular orbital analysis demonstrated that the d-π orbital overlaps can explain the approach direction of the olefin coordination and the bent structure of zirconocene, providing a different viewpoint from previous studies. The potential for catalyst control was discussed based on our results. © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- Yuuichi Orimoto
- Department of Material Sciences, Faculty of Engineering Sciences, Kyushu University, 6-1 Kasuga-Park, Fukuoka, 816-8580, Japan
| | - Satoru Shirane
- Department of Molecular and Material Sciences, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga-Park, Fukuoka, 816-8580, Japan
| | - Yuriko Aoki
- Department of Material Sciences, Faculty of Engineering Sciences, Kyushu University, 6-1 Kasuga-Park, Fukuoka, 816-8580, Japan.,Japan Science and Technology Agency, CREST, 4-1-8 Hon-chou, Kawaguchi, Saitama, 332-0012, Japan
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Saha S, Takayanagi M, Matsumoto K, Sankaran SK, Tanaka Y, Koga N, Nagaoka M. Probing the Most Stable Isomer of Zirconium Bis(phenoxy-imine) Cation: A Computational Investigation. J Phys Chem A 2018; 122:2198-2208. [PMID: 29394059 DOI: 10.1021/acs.jpca.7b10999] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The possibility of coexistence of multiple isomers for zirconium bis(phenoxy-imine) catalyst has been systematically studied by computational approaches. The energetics among the five different isomers of neutral Zr-catalyst have been assessed quantum mechanically. The results suggest that isomer cis-N/trans-O/cis-Me is the most stable among the five isomers in accordance with the general observations of these kinds of phenoxy-imine catalyst. However, for the polymerization reaction, the active species is known to be the cationic form of the Zr-catalyst. The Zr-cation can exist in three different isomers, viz., cis-N/trans-O (A), cis-N/cis-O (B), and trans-N/cis-O (C), and the presence of flexible ligands makes the modeling considerably challenging to determine the most preferable isomers. For the efficient modeling, altogether 80 different structures for each of the three cationic isomers have been generated by using molecular dynamics simulations, and subsequently, the quantum mechanical optimization of these structures has been performed to obtain the most preferable conformation for each isomer. The existing probability derived from the obtained free energy values suggests that isomer C is comparable with isomer A. Even more, isomer A of the cation can be present in two different conformations, where the orientation of side groups is altered at the imine nitrogen atoms. The transition state calculations also confirm that the Zr-cation can exist as a mixture of three structures, "up-down" and "down-down" orientations of the isomers A along with isomer C's "up-up" orientation. However, by varying the substituents at imine nitrogen atoms, one could modulate multimodal to unimodal polymerization behavior of the Zr-catalysts. We believe that this study should provide a starting point for theoretically exploring the mechanistic pathway of the complicated polymerization reactions.
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Affiliation(s)
- Soumen Saha
- Graduate School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan.,Core Research for Evolutional Science and Technology, Japan Science and Technology Agency , Honmachi, Kawaguchi 332-0012, Japan
| | - Masayoshi Takayanagi
- Graduate School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan.,Core Research for Evolutional Science and Technology, Japan Science and Technology Agency , Honmachi, Kawaguchi 332-0012, Japan.,The Center for Data Science Education and Research, Shiga University , 1-1-1, Banba, Hikone 522-8522, Japan
| | - Kentaro Matsumoto
- Graduate School of Information Science, Nagoya University , Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Sandhya Karakkadparambil Sankaran
- Core Research for Evolutional Science and Technology, Japan Science and Technology Agency , Honmachi, Kawaguchi 332-0012, Japan.,Graduate School of Information Science, Nagoya University , Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Yuichi Tanaka
- Graduate School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan.,Core Research for Evolutional Science and Technology, Japan Science and Technology Agency , Honmachi, Kawaguchi 332-0012, Japan
| | - Nobuaki Koga
- Graduate School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan.,Core Research for Evolutional Science and Technology, Japan Science and Technology Agency , Honmachi, Kawaguchi 332-0012, Japan
| | - Masataka Nagaoka
- Graduate School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan.,Core Research for Evolutional Science and Technology, Japan Science and Technology Agency , Honmachi, Kawaguchi 332-0012, Japan.,Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University Katsura , Kyoto 615-8520, Japan
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Matsumoto K, Takayanagi M, Sankaran SK, Koga N, Nagaoka M. Role of the Counteranion in the Reaction Mechanism of Propylene Polymerization Catalyzed by a (Pyridylamido)hafnium(IV) Complex. Organometallics 2018. [DOI: 10.1021/acs.organomet.7b00767] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- K. Matsumoto
- Graduate
School of Information Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - M. Takayanagi
- Graduate
School of Information Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
- The
Center for Data Science Education and Research, Shiga University, 1-1-1
Banba, Hikone, Shiga 522-8522, Japan
- Core
Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Honmachi, Kawaguchi 332-0012, Japan
| | - S. K. Sankaran
- Graduate
School of Information Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
- Core
Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Honmachi, Kawaguchi 332-0012, Japan
| | - N. Koga
- Core
Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Honmachi, Kawaguchi 332-0012, Japan
- Graduate
School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - M. Nagaoka
- Core
Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Honmachi, Kawaguchi 332-0012, Japan
- Graduate
School of Informatics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
- Elements
Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyodai
Katsura, Kyoto 615-8520, Japan
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Ishii A, Ikuma K, Nakata N, Nakamura K, Kuribayashi H, Takaoki K. Zirconium and Hafnium Complexes with Cycloheptane- or Cyclononane-Fused [OSSO]-Type Bis(phenolato) Ligands: Synthesis, Structure, and Highly Active 1-Hexene Polymerization and Ring-Size Effects of Fused Cycloalkanes on the Activity. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00586] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Akihiko Ishii
- Department
of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan
| | - Keita Ikuma
- Department
of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan
| | - Norio Nakata
- Department
of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan
| | - Kazuaki Nakamura
- Department
of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan
| | - Hiroshi Kuribayashi
- Petrochemical
Research Laboratory, Sumitomo Chemical Co., Ltd., 2-1 Kitasode, Sodegaura, Chiba 299-0295, Japan
| | - Kazuo Takaoki
- Petrochemical
Research Laboratory, Sumitomo Chemical Co., Ltd., 2-1 Kitasode, Sodegaura, Chiba 299-0295, Japan
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6
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Matsumoto K, Sandhya KS, Takayanagi M, Koga N, Nagaoka M. An Active Site Opening Mechanism in a (Pyridylamide)hafnium(IV) Ion Pair Catalyst: An Associative Mechanism. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00804] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kentaro Matsumoto
- Graduate
School of Information Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Karakkadparambil Sankaran Sandhya
- Graduate
School of Information Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
- Core
Research for Evolutional Science and Technology, Japan Science and Technology Agency,
Honmachi, Kawaguchi 332-0012, Japan
| | - Masayoshi Takayanagi
- Graduate
School of Information Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
- Core
Research for Evolutional Science and Technology, Japan Science and Technology Agency,
Honmachi, Kawaguchi 332-0012, Japan
| | - Nobuaki Koga
- Graduate
School of Information Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
- Core
Research for Evolutional Science and Technology, Japan Science and Technology Agency,
Honmachi, Kawaguchi 332-0012, Japan
| | - Masataka Nagaoka
- Graduate
School of Information Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
- Core
Research for Evolutional Science and Technology, Japan Science and Technology Agency,
Honmachi, Kawaguchi 332-0012, Japan
- Elements
Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University Katsura, Kyoto 615-8520, Japan
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