2007 Fiscal Year Final Research Report Summary
Synthesis of Group 4 Post-Metallocene Complexes for Activation of Small Molecules
| Project/Area Number |
17350031
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic chemistry
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| Research Institution | The Institute of Physical and Chemical Research (2007)
Institute for Molecular Science (2005-2006) |
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Principal Investigator |
TSUKASA Matsuo The Institute of Physical and Chemical Research, Functional Elemento-Organic Chemistry, Deputy Unit Leader (90312800)
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| Project Period (FY) |
2005 – 2007
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| Keywords | post-metallocene / titanium / zirconium / phenoxide ligand / activation of small molecules / carbon monoxide / carbon dioxide / dinitrogen molecule |
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| Research Abstract |
A variety of group 4 metal complexes incorporating multidentate phenoxide ligands have been synthesized and their molecular structures have been confirmed by X-ray crystallography. The electronic and steric properties, and chelating effect of the new donating system have been examined for the construction of highly reactive metal species. We have succeeded in activation of small molecules such as dihydrogen, dinitrogen, carbon monoxide, and carbon dioxide by using the early transition metal complexes having multidentate phenoxide ligands. For example, the zirconium complexes supported by the anisole-bridged bis (phenoxide) ligands serve as an easily recycled auxiliary for converting H_2 and CO into allene and hexamethyldisiloxane under mild conditions. Hydrogenolysis of the zirconium benzyl complexes followed by treatment with CO led to formation of oxo-bridged complexes and allene. Deoxygenation of the resulting oxo-bridged complexes with trimethylsilyltrifluoromethanesulfonate and trimethylsilyl chloride and subsequent treatment with benzylmagnesium chloride re-formed the starting benzyl complexes. We have also shown that CO_2 is catalytically converted into methane and siloxanes via bis (silyl)acetals with a mixture of a zirconium alkyl phenoxide complex and B (C_6F_5)_3. Our method for catalytic reduction of CO_2 offers some significant advantages, since it proceeds under mild conditions and permits complete reduction of CO_2 to CH_4. Another curious aspect of this system is the formation of functional siloxane materials from CO_2 and hydrosilanes in chemical CO_2 fixation. We have also found that exposure of a solution of the niobium hydride complex supported by a tripodal triaryloxide ligand with N_2 gas resulted in the formation of nitride complex and H_2 with concomitant cleavage of the dinitrogen triple bond. The nitride ligands undergo alkylation with MeI in a stepwise fashion, resulting in formation of a bis (imide) complex via a nitride imide complex.
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[Presentation] 三脚型アリールオキシドを配位子とするニオブ(IV) 錯体の合成と反応2007
Author(s)
Fumio Akagi, Tsukasa Matsuo, Hiroyuki Kawaguchi
Organizer
The 57th Symposium on Coordination Chemistry of Japan
Place of Presentation
Nagoya Institute of Technology(Nagoya)
Year and Date
2007-09-25
Description
「研究成果報告書概要(欧文)」より
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[Presentation] フェノキシドーチオフェノキシド混合型二座配位子を用いた4族遷移金属錯体の合成2007
Author(s)
Tomohide Fukawa, Tsukasa Matsuo, Hiroyuki Kawaguchi
Organizer
The 57th Symposium on Coordination Chemistry of Japan
Place of Presentation
Nagoya Institute of Technology(Nagoya)
Year and Date
2007-09-25
Description
「研究成果報告書概要(欧文)」より
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[Presentation] かさ高いフェノキシド配位子を有するジウコニウム錯体の合成2007
Author(s)
Takahito Watanabe, Tsukasa Matsuo, Hiroyuki Kawaguchi
Organizer
The 87th Spring Meeting of Chemical Society of Japan
Place of Presentation
Kansai University(Senriyama)
Year and Date
2007-03-25
Description
「研究成果報告書概要(欧文)」より
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[Presentation] フェノキシドーチオフェノキシド混合型2座配位子を用いたチタン錯体の合成2007
Author(s)
Tomohide Fukawa, Tsukasa Matsuo, Hiroyuki Kawaguchi
Organizer
The 87th Spring Meeting of Chemical Society of Japan
Place of Presentation
Kansai University(Senriyama)
Year and Date
2007-03-25
Description
「研究成果報告書概要(欧文)」より
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[Presentation] NS2をドナーセットとする鉄錯体の合成と反応2007
Author(s)
Hidekazu Arii, Tsukasa Matsuo, Hiroyuki Kawaguchi
Organizer
The 87th Spring Meeting of Chemical Society of Japan
Place of Presentation
Kansai University(Senriyama)
Year and Date
2007-03-25
Description
「研究成果報告書概要(欧文)」より
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[Presentation] アニソール-フェノキシド混合型三座配位子を有する4族遷移金属錯体の合成2006
Author(s)
Tsukasa Matsuo, Hiroyuki Kawaguchi
Organizer
The 57th Symposium on Coordination Chemistry of Japan
Place of Presentation
Hiroshima University(Higashihiroshima)
Year and Date
2006-09-17
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 三脚型多座アリールオキシドを配位子とするニオ錯体の合成と反応2006
Author(s)
Fumio Akagi, Tsukasa Matsuo, Hiroyuki Kawaguchi
Organizer
The 57th Symposium on Coordination Chemistry of Japan
Place of Presentation
Hiroshima University(Higashihiroshima)
Year and Date
2006-09-17
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 三脚座トリ(オキシフェニル) メタン配位子を有するニオブ錯体の合成と反応2006
Author(s)
Fumio Akagi, Tsukasa Matsuo, Hiroyuki Kawaguchi
Organizer
The 86th Spring Meeting of Chemical Society of Japan
Place of Presentation
Nihon University(Funahashi)
Year and Date
2006-03-27
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 三脚座フェノキシド配位子を有するタングステン錯体の合成と構造2006
Author(s)
Mitsuharu Fujita, Fumio Akagi, Tsukasa Matsuo, Hiroyuki Kawaguchi
Organizer
The 86th Spring Meeting of Chemical Society of Japan
Place of Presentation
Nihon University(Funahashi)
Year and Date
2006-03-27
Description
「研究成果報告書概要(欧文)」より
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[Presentation] フェノキシド基を基盤とする三座配位子を用いた5族金属錯体の合成2006
Author(s)
Takahito Watanabe, Tsukasa matsuo, Hiroyuki Kawaguchi
Organizer
The 86th Spring Meeting of Chemical Society of Japan
Place of Presentation
Nihon University(Funahashi)
Year and Date
2006-03-27
Description
「研究成果報告書概要(欧文)」より
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[Presentation] かさ高いフェノキシド配位子を有する前周期遷移金属錯体の合成と構造2005
Author(s)
Motoki Takuma, Tsukasa Matsuo, Hiroyuki Kawaguchi
Organizer
The 57th Symposium on Coordination Chemistry of Japan
Place of Presentation
朱鷺メッセ(Niigata)
Year and Date
2005-09-22
Description
「研究成果報告書概要(欧文)」より
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