Dinuclear Benzene Linker Bis(pyrazolyl)amine Cobalt(II) Complexes and their Application as Selective Ethylene Dimerization Catalysts

IF 2 4区 化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR
Francis K. Migwi, George S. Nyamato, Stephen O. Ojwach
{"title":"Dinuclear Benzene Linker Bis(pyrazolyl)amine Cobalt(II) Complexes and their Application as Selective Ethylene Dimerization Catalysts","authors":"Francis K. Migwi,&nbsp;George S. Nyamato,&nbsp;Stephen O. Ojwach","doi":"10.1002/ejic.202500204","DOIUrl":null,"url":null,"abstract":"<p>Reactions of synthons <i>N</i>,<i>N′</i>-(1,4-phenylenebis(methylene))bis(2-(1<i> H</i>-pyrazol-1-yl)ethan-1-amine) (<b>L1)</b>, <i>N</i>,<i>N</i>′-(1,4-phenylenebis(methylene))bis(2-(3,5-dimethyl-1<i> H</i>-pyrazol-1-yl)ethan-1-amine) (<b>L2)</b>, <i>N</i>,<i>N</i>′-(1,4-phenylenebis(methylene))bis(2-(3,5-di-<i>tert</i>-butyl-1<i> H</i>-pyrazol-1-yl)ethan-1-amine) (<b>L3)</b>, and <i>N</i>,<i>N</i>′-(1,3-phenylenebis(methylene))bis(2-(3,5-dimethyl-1<i> H</i>-pyrazol-1-yl)ethan-1-amine) (<b>L4)</b> with CoCl<sub>2</sub> produce the dinuclear cobalt(II) complexes [Co<sub>2</sub>(<b>L1</b>)Cl<sub>4</sub>] (<b>Co1</b>), [Co<sub>2</sub>(<b>L2</b>)Cl<sub>4</sub>] (<b>Co2</b>), [Co<sub>2</sub>(<b>L3</b>)Cl<sub>4</sub>] (<b>Co3</b>), and [Co<sub>2</sub>(<b>L4</b>)Cl<sub>4</sub>] (<b>Co4</b>), respectively. These new complexes are characterized using fourier transform-infra red and ultra-violet (UV)–Visible spectroscopies, elemental analysis, and single crystal X-ray crystallography diffraction for complexes <b>Co2</b> and <b>Co3</b>. The molecular structures of <b>Co2</b> and <b>Co3</b> confirm the formation of the dinuclear cobalt species. Activation of the precatalysts <b>Co1</b>–<b>Co4</b> with either EtAlCl<sub>2</sub> or Me<sub>3</sub>Al, affords active (up to 5.26 × 10<sup>5</sup> g·mol<sup>−1</sup>Co h<sup>−1</sup>) and selective ethylene dimerization (&gt;98%) catalysts. The steric parameters of the coordinated ligands, as dictated by the substituents on the pyrazolyl ring, largely controll both the activity and regioselectivity of the resultant catalysts.</p>","PeriodicalId":38,"journal":{"name":"European Journal of Inorganic Chemistry","volume":"28 22","pages":""},"PeriodicalIF":2.0000,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/ejic.202500204","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"European Journal of Inorganic Chemistry","FirstCategoryId":"1","ListUrlMain":"https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/ejic.202500204","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0

Abstract

Reactions of synthons N,N′-(1,4-phenylenebis(methylene))bis(2-(1 H-pyrazol-1-yl)ethan-1-amine) (L1), N,N′-(1,4-phenylenebis(methylene))bis(2-(3,5-dimethyl-1 H-pyrazol-1-yl)ethan-1-amine) (L2), N,N′-(1,4-phenylenebis(methylene))bis(2-(3,5-di-tert-butyl-1 H-pyrazol-1-yl)ethan-1-amine) (L3), and N,N′-(1,3-phenylenebis(methylene))bis(2-(3,5-dimethyl-1 H-pyrazol-1-yl)ethan-1-amine) (L4) with CoCl2 produce the dinuclear cobalt(II) complexes [Co2(L1)Cl4] (Co1), [Co2(L2)Cl4] (Co2), [Co2(L3)Cl4] (Co3), and [Co2(L4)Cl4] (Co4), respectively. These new complexes are characterized using fourier transform-infra red and ultra-violet (UV)–Visible spectroscopies, elemental analysis, and single crystal X-ray crystallography diffraction for complexes Co2 and Co3. The molecular structures of Co2 and Co3 confirm the formation of the dinuclear cobalt species. Activation of the precatalysts Co1Co4 with either EtAlCl2 or Me3Al, affords active (up to 5.26 × 105 g·mol−1Co h−1) and selective ethylene dimerization (>98%) catalysts. The steric parameters of the coordinated ligands, as dictated by the substituents on the pyrazolyl ring, largely controll both the activity and regioselectivity of the resultant catalysts.

Abstract Image

Abstract Image

Abstract Image

双(吡唑基)胺钴(II)配合物及其作为选择性乙烯二聚化催化剂的应用
反应合成纤维的N, N ' - (1, 4-phenylenebis(亚甲基)二(2 - (1 H-pyrazol-1-yl) ethan-1-amine) (L1), N, N ' - (1, 4-phenylenebis(亚甲基)二(2 - (3,5-dimethyl-1 H-pyrazol-1-yl) ethan-1-amine) (L2), N, N ' - (1, 4-phenylenebis(亚甲基)二(2 - (3,5-di-tert-butyl-1 H-pyrazol-1-yl) ethan-1-amine) (L3)和N, N ' - (1, 3-phenylenebis(亚甲基)二(2 - (3,5-dimethyl-1 H-pyrazol-1-yl) ethan-1-amine) (L4) CoCl2产生双核的钴(II)配合物(二氧化碳(L1) Cl4] (Co1), (L2) Cl4][二氧化碳(Co2),(二氧化碳(L3) Cl4](二氧化碳),和[Co2(L4)Cl4] (Co4)。利用傅里叶变换-红外和紫外-可见光谱、元素分析和单晶x射线衍射对这些新的配合物Co2和Co3进行了表征。Co2和Co3的分子结构证实了双核钴的形成。用EtAlCl2或Me3Al活化预催化剂Co1-Co4,可获得活性(高达5.26 × 105 g·mol−1Co h−1)和选择性乙烯二聚(98%)催化剂。配位体的空间参数由吡唑基环上的取代基决定,在很大程度上控制了所合成催化剂的活性和区域选择性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
European Journal of Inorganic Chemistry
European Journal of Inorganic Chemistry 化学-无机化学与核化学
CiteScore
4.30
自引率
4.30%
发文量
419
审稿时长
1.3 months
期刊介绍: The European Journal of Inorganic Chemistry (2019 ISI Impact Factor: 2.529) publishes Full Papers, Communications, and Minireviews from the entire spectrum of inorganic, organometallic, bioinorganic, and solid-state chemistry. It is published on behalf of Chemistry Europe, an association of 16 European chemical societies. The following journals have been merged to form the two leading journals, European Journal of Inorganic Chemistry and European Journal of Organic Chemistry: Chemische Berichte Bulletin des Sociétés Chimiques Belges Bulletin de la Société Chimique de France Gazzetta Chimica Italiana Recueil des Travaux Chimiques des Pays-Bas Anales de Química Chimika Chronika Revista Portuguesa de Química ACH—Models in Chemistry Polish Journal of Chemistry The European Journal of Inorganic Chemistry continues to keep you up-to-date with important inorganic chemistry research results.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信