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Synthesis of Chromium(II) Complexes Based on Zwitterion Structure for Ethylene Tetramerization
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | 이분열 | - |
| dc.contributor.author | 이동환 | - |
| dc.date.accessioned | 2018-11-08T08:16:16Z | - |
| dc.date.available | 2018-11-08T08:16:16Z | - |
| dc.date.issued | 2016-02 | - |
| dc.identifier.other | 21556 | - |
| dc.identifier.uri | https://dspace.ajou.ac.kr/handle/2018.oak/12110 | - |
| dc.description | 학위논문(석사)--아주대학교 일반대학원 :분자과학기술학과,2016. 2 | - |
| dc.description.tableofcontents | 1. Introduction 1 2. Results and Discussion 2 2.1 Ligand Synthesis 2 2.2 Metalation Reaction 5 2.3 X-ray Crystallographic Studies 7 2.4 Ethylene Oligomerization Studies 12 3. Conclusions 12 4. Experimental Section 13 4.1 General remarks 13 4.2 Synthesis of ligands and complexes 13 4.3 Typical procedure for ethylene oligomerzation 19 4.4 X-ray Crystallography 19 5. Acknowledgements 21 6. Reference 21 7. Supporting information 25 | - |
| dc.language.iso | eng | - |
| dc.publisher | The Graduate School, Ajou University | - |
| dc.rights | 아주대학교 논문은 저작권에 의해 보호받습니다. | - |
| dc.title | Synthesis of Chromium(II) Complexes Based on Zwitterion Structure for Ethylene Tetramerization | - |
| dc.title.alternative | Synthesis of Chromium(II) Complexes Based on Zwitterion Structure for Ethylene Tetramerization | - |
| dc.type | Thesis | - |
| dc.contributor.affiliation | 아주대학교 일반대학원 | - |
| dc.contributor.alternativeName | Lee Dong Hwan | - |
| dc.contributor.department | 일반대학원 분자과학기술학과 | - |
| dc.date.awarded | 2016. 2 | - |
| dc.description.degree | Master | - |
| dc.identifier.localId | 739450 | - |
| dc.identifier.url | http://dcoll.ajou.ac.kr:9080/dcollection/jsp/common/DcLoOrgPer.jsp?sItemId=000000021556 | - |
| dc.subject.keyword | chromium | - |
| dc.subject.keyword | tetramerization | - |
| dc.subject.keyword | oligomerization | - |
| dc.subject.keyword | zwitterion | - |
| dc.subject.keyword | polyolefin | - |
| dc.description.alternativeAbstract | We previously explored about Philips trimerization system and elucidated the zwitterion-type η5-pyrrole Cr(II) complexes. Herein, we report a series of zwitterion-type Cr(II) complexes to investigate ethylene oligomerization activity. Lithium bis(phosphino)aluminate (4, [Et2Al(PPh2)2]Li(THF); 5, [Et2Al(PCy2)2] Li(THF)2), lithium bis(amino)aluminate (6, [Et2Al(NC4H8)2]Li(THF); 7, [Et2Al(NiPr2)2]Li; 8, [iBu2Al(NiPr2)2]Li), and potassium bis(phosphino)borate ligands (11, [(C6F5)2B(PPh2)2]K; 12, [(C6F5)2B(PCy2)2]K) were prepared. Reaction of 4-6 with CrCl3(THF)3 did not provide any discrete chromium complexes, but the reaction of 5-6 with CrCl2(THF) yielded zwitterion-type Cr(II) complexes (13, [Et2Al(PCy2)2]2Cr(II); 14, [Et2Al(NC4H8)2]2Cr(II)). Reaction of THF-free 7-8 with CrCl3(THF)3 resulted in the formation of Cl-bridged Cr(II) dimer complexes {[Et(Cl)Al(NiPr2)2]Cr(II)- 2-Cl}2 (15) and {[iBu(Cl)Al(NiPr2)2]Cr(II)- 2-Cl}2 (16). A similar Cl-bridged Cr(II) dimer complex {[(C6F5)2B(PCy2)2]Cr(II)-μ2-Cl}2 (17) was also obtained by reacting the borate ligand 12 with CrCl2(THF). The structures of 13-17 were elucidated by X-ray crystallography. None of the prepared zwitterion-type Cr(II) complexes 13-17 exhibited any activity after activation with MAO, supporting catalytic cycle involving Cr(I/III) oxidation states in ethylene oligomerization. | - |
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