Research Projects

• Activation of Small Molecules by Use of Metal Complexes Bearing New Tripodal Tetradentate Ligands, Takeda Nobuhiro, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Gunma University, Apr. 2015, Mar. 2018, Principal investigator, We synthesized group 9-11 metal complexes bearing new PS3-type or SiS3-type tripodal tetradentate ligands, and revealed their structures, reactivity and catalytic activity. A rhodium complex bearing the SiS3-type ligand, [RhCl(C8H13){Si(C6H4-2-S-i-Pr)3}], catalyzed hydrosilylation of phenylacetylene to give the corresponding Z-alkene at room temperature. On the other hand, the reaction at 50 °C resulted in the formation of the corresponding E-alkene as a main product. It is interesting that the selectivity is changed by the reaction temperature. In addition, a rhodium(I) complex bearing the PS3-type ligand, [RhCl{P(C6H4-2-S-i-Pr)3}], readily reacted with O2 to afford the corresponding Rh-O2 complex. It is expected that the rhodium(I) complex can activate O2 molecule., Competitive research funding, 15K05417, url

  対象リソースIRI
• Synthesis of Reactive Metal Complexes Bearing New Tripodal Ligand and Their Application to the Activation of Small Molecules, TAKEDA Nobuhiro, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Gunma University, Apr. 2012, Mar. 2015, Principal investigator, We synthesized dimethylpalladium complex, group 11 metal complexes and dichlororuthenium complex bearing a new tripodal tetradentate phosphine ligand, P[C6H4-2-S(i-Pr)]3 (1). Palladium and platinum complexes bearing a new tripodal tetradentate silyl ligand, －Si(C6H4-2-SR)3 (2), were also synthesized. Their structures and reactivities were elucidated and catalytic reactions of PhCH2CH2OH with HSiEt3 using [Ag2(1)2]2(ClO4) or [Au2(1)2]2(OTf), catalytic oxidation of and catalytic hydrosilylation of 4-phenyl-1-butene with HSi(OEt)3 using [PtCl(2)] were found., Competitive research funding, 24550039, url

  対象リソースIRI
• Systematic Studies on the Synthesis of New Tripodal Ligands and Their Metal Complexes for the Activation of Small Molecules, TAKEDA Nobuhiro, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Gunma University, Apr. 2009, 2011, Principal investigator, Group 10 metal(II) complexes bearing a new tripodal tetradentate ligand, E[C_6H_4(2-YR)]_3 (1,_EYR> : E = P, Si^-; Y = O, S, Se, CH_2S (mS) ; R = i-Pr (Pr), t-Bu (Bu)), were synthesized, and their properties were systematically elucidated. In addition, we succeeded in the synthesis of dimethylpalladium complex, [PdMe_2(1_)], and cationic iridium complex having vacant coordination site, [IrH(1_)]ClO_4. These complexes are expected to be highly reactive to small molecules such as N_2 and CO_2., Competitive research funding, 21550034, kaken

  対象リソースIRI
• Synthesis of New Polychalcogenoether Ligands for the Activation ofSmall Molecules and Their Application, TAKEDA Nobuhiro, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Gunma University, Apr. 2007, 2008, Principal investigator, Competitive research funding, 19550030, kaken

  対象リソースIRI
• The Chemistry of Unsaturated Compounds of Heavier Main Group Elements : Pursuit of Novel Properties, TOKITOH Norihiro; SASAMORI Takahiro; MATSUDA Kazunari; NAGASE Shigeru; FURUKAWA Yukio; MIZUHATA Yoshiyuki; TAJIMA Tomoyuki; NAGAHORA Noriyoshi; TAKEDA Nobuhiro; TSUJI Hayato; SATO Naoki, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Creative Scientific Research, Kyoto University, Apr. 2005, 2009, Unsaturated compounds between the second row elements such as carbon and oxygen has played an important role in the function of organic compounds. In order to open the new chemistry of unsaturated compounds, we focused our attention on multiple-bond compounds between heavier elements such as silicon and phosphorus as novel functional materials. As a result, several numbers of novel unsaturated compounds between heavier elements have been successfully synthesized by utilizing kinetic stabilization and we have revealed their functions on the basis of element chemistry., Competitive research funding, 17GS0207, kaken

  対象リソースIRI
• Synthesis and Properties of Compounds Having Double Bond between Group 10 Element and Chalcogen Atom, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), Kyoto University, Apr. 2003, 2004, Principal investigator, 15750031, kaken

  対象リソースIRI
• Studies on the Synthesis, Structures, Properties and Functions of Aromatic Compounds Containing Heavier Group 14 Elements, TOKITOH Norihiro; TAKEDA Nobuhiro, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), KYOTO UNIVERSITY, Apr. 2002, 2004, Coinvestigator, There has been no stable, neutral heteraaromatic compounds containing heavier group 14 elements, and their structures and properties have not been revealed yet. In this project, we studied on the synthesis of new type of heteraaromatic compounds containing a heavier group 14 element by taking advantage of effective steric protection group, 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl (Tbt) and 2,6-bis[bis(trimethylsilyl)methyl]-4-[tris(trimethylsilyl)methyl]phenyl (Bbt) and elucidated their sturctures and properties. Based on these results, we revealed the aromaticity of these compounds. We succeeded in the synthesis and isolation of the first stable silabenzene, 1-silanaphthalene, 2-silanaphthalene, 9-silaanthracene, 9-silaphenanthrene, germabenzene, 2-germanaphthalene, and 9-germaanthracene as stable crystals by taking advantage of Tbt and Bbt groups. The X-ray structural analyses, spectral data on NMR, UV/vis, and Raman spectroscopy, and theoretical calculations indicated that all these compounds are aromatic compounds as well as the corresponding carbon analogues. It was elucidated that these compounds underwent ready 1,2-or 1,4-addition towards the Si=C or Ge=C double-bond with H_2O, MeOH, and so on. Interestingly, the sila-and germabenzene were found to form the η^6-metallabenzene arene complexes with group 6 metals (Cr,Mo,and W). We think that the new knowledge obtained in this project lays the foundations of the chemistry of heteraaromatic compounds containing heavier group 14 elements. We expect that novel properties and functions of heteraaromatic compounds containing heavier group 14 elements will be revealed on the basis of these results, showing the potential applicability. Such chemistry will be applied to not only the synthesis of novel functional compounds but also the novel catalysis., 14204064, kaken

  対象リソースIRI
• 2003, Mar. 2004, Principal investigator, 15750031, kaken

  対象リソースIRI
• Synthesis of Novel Species Having Double Bonds with Silicon by Using Silylene–Isocyanide Copmlex and Their Porperties, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), Kyoto University, Apr. 2001, 2002, Principal investigator, 13740353, kaken

  対象リソースIRI
• Synthesis of Triplet Silylene by Taking Advantage of Steric and Electronic Properties of Substituents, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas (A), Grant-in-Aid for Scientific Research on Priority Areas (A), Kyoto University, Apr. 2000, 2001, Principal investigator, 12020243, kaken

  対象リソースIRI
• Systematic Studies on the Synthesis, Structures, and Properties of Aromatic Compounds Containing Heavier Group 14 Elements, TOKITOH Norihiro; TAKEDA Nobuhiro, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), Apr. 1999, 2001, Coinvestigator, There has been no stable, neutral heteraaromatic compounds containing heavier group 14 elements, and their structures and properties have been revealed yet. In this Project, we studied on the synthesis of new type of heteraaromatic compounds containing a heavier group 14 element by taking advantage of an effective steric protection group, 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl (Tbt), which is developed by us, and elucidated their structures and properties. Based on these results, we estimated the aromaticity of these compounds, systematically. We succeeded in the synthesis and isolation of the first stable silabenzene, 1-silanaphthalene, 2-silanaphthalene, 9-silaanthracene, germabenzene, and 2-germanaphthalene as stable crystals by taking advantage of Tbt group. The X-ray structural analyses, spectral data on NMR, UV/vis, and Raman spectroscopy, and theoretical calculations indicated that all these compounds are aromatic compounds as aromaticity these compounds showed the high reactivities to H_2O, alcohols, olefins, alkynes, ketones, and nitrile oxides and underwent ready addition of these reagents to the Si=C or Ge=C double-bond. We think that the new knowledge obtained in this project lays the foundations of the chemistry of heteraaromatic compounds containing heavier group 14 elements. We expect that novel properties and functions of heteraaromatic compounds containing heavier group 14 elements will be revealed on the basis of these results, showing the potential applicability and these chemistry will be applied to the synthesis of novel functional compounds and novel catalysis., 11304045, kaken

  対象リソースIRI
• Synthesis of Doubly Bonded Compounds between Three-coordinate Zirconium and Group 16 Element Taking Advantage of Steric Protection, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Encouragement of Young Scientists (A), Grant-in-Aid for Encouragement of Young Scientists (A), Apr. 1999, 2000, Principal investigator, 11740357, kaken

  対象リソースIRI
• Synthesis of Triplet Silylene by Taking Advantage of Steric and Electronic Properties of Substituents, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas (A), Grant-in-Aid for Scientific Research on Priority Areas (A), Kyushu University, Apr. 1999, 1999, Principal investigator, 11133247, kaken

  対象リソースIRI
• Synthesis of Dinuclear Metal Complexes Bearing Novel Heptadentate Double-decker Ligand and Elucidation of Their Reactivity and Catalytic Activity, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Gunma University, 01 Apr. 2023, 31 Mar. 2028, 23K04762, kaken

  対象リソースIRI