Takeaki Iwamoto
Tohoku University
IsomerizationRadicalComputational chemistryReactivity (chemistry)Medicinal chemistryOrganic chemistryChemistryPolymer chemistryMaterials scienceBicyclic moleculeSilyleneTrimethylsilylDisileneCycloadditionMoleculeSiliconDouble bondStereochemistryPhotochemistryCrystallography
184Publications
35H-index
3,760Citations
Publications 171
Newest
#1Takumi Nukazawa (Tohoku University)H-Index: 1
#2Takeaki Iwamoto (Tohoku University)H-Index: 35
1,3-Diethynylbicyclo[1.1.0]tetrasilanes that contain an unsupported bridgehead Si-Si π-bond and ethynyl π-moieties were synthesized by the reaction of a 1,3-dihalobicyclo[1.1.0]tetrasilane with the corresponding lithium acetylide. The substantial bathochromic shift of the longest-wavelength absorption band observed for the phenylethynyl-substituted bicyclo[1.1.0]tetrasilane in the solid state compared to that of the octynyl-substituted derivative suggested the presence of effective π-conjugation...
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#1Taichi Koike (Tohoku University)H-Index: 2
#2Takumi Nukazawa (Tohoku University)H-Index: 1
Last. Takeaki Iwamoto (Tohoku University)H-Index: 35
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Complexes that could be switched between two electronic states by external stimuli have attracted much attention for their potential application in molecular devices. However, a realization of such a phenomenon with low-valent main-group element-centered complexes remains challenging. Herein, we report the synthesis of cyclic (alkyl)(amino)silylene (CAASi)-ligated monatomic silicon(0) complexes (silylones). The bis(CAASi)-ligated silylone adopts a π-localized ylidene structure (greenish-black co...
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#1Hayato Sasaki (Tohoku University)
#2Yuki Yokouchi (Tohoku University)H-Index: 1
Last. Takeaki Iwamoto (Tohoku University)H-Index: 35
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#1Takeaki Iwamoto (Tohoku University)H-Index: 35
#2Dongzhu Yin (Tohoku University)H-Index: 4
Last. Mitsuo Kira (Tohoku University)H-Index: 57
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#1Taichi Koike (Tohoku University)H-Index: 2
#2Takeaki Iwamoto (Tohoku University)H-Index: 35
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#1Ryo Kobayashi (Tohoku University)H-Index: 28
#2Shintaro Ishida (Tohoku University)H-Index: 27
Last. Takeaki Iwamoto (Tohoku University)H-Index: 35
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Although isolable silicon analogs of acetylene have been extensively studied, the silicon analogs of vinylidene, which is a short-lived isomer of acetylene, remain scarce. Herein, we report isolabl...
3 CitationsSource
#1Kaho TanakaH-Index: 1
#2Naohiko AkasakaH-Index: 6
Last. Takeaki IwamotoH-Index: 35
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π-Electron systems of silicon have attracted attention because of their narrow HOMO-LUMO gap and high reactivity, but the structural diversity remains limited. Herein, new dialkylboryl-substituted disilenes were synthesized by the selective desilylation-borylation of the corresponding trimethylsilyl-substituted disilenes. The dialkylboryl-substituted disilenes were fully characterized by a combination of NMR spectroscopy, MS spectrometry, single-crystal X-ray diffraction analysis, and theoretica...
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#1Shunya Honda (Tohoku University)H-Index: 2
#2Ryutaro Sugawara (Tohoku University)H-Index: 1
Last. Takeaki Iwamoto (Tohoku University)H-Index: 35
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Spiroconjugation, that is, through-space orbital interactions between two perpendicular π orbitals, is a key concept in the contemporary molecular design of spirocyclic π-electron systems. We synthesized spiropentasiladiene radical cation salt 1 as a dark-green solid via the one-electron oxidation of the stable spiropentasiladiene 2. Characterization of the molecular structure combined with theoretical studies indicated that the spin and positive charge are delocalized across the two perpendicul...
4 CitationsSource
#1Haruki Kisu (Nagoya University)H-Index: 2
#2Tomoyuki Kosai (Tohoku University)H-Index: 7
Last. Makoto Yamashita (Nagoya University)H-Index: 43
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A cyclic (alkyl)(amino)bromoborane (CAABBr) was synthesized by a reaction of the corresponding hydroborane with bromine in the presence of triethylamine. Reduction of the resulting CAABBr with Li p...
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#1Ryo Kobayashi (Tohoku University)H-Index: 28
#2Shintaro IshidaH-Index: 27
Last. Takeaki IwamotoH-Index: 35
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An isolable three-coordinate dialkylsilanone without a substantial electronic stabilization reacts with several ethers resulting in the cleavage of the C-O or C-H and C-O bonds in ether which have not been observed for the hitherto-known electronically stabilised isolable Si=O species. The formation of the Lewis base (DMAP and MTHP) complexes of the dialkylsilanone as well as the DFT calculations elucidated that the coordination of the ethereal oxygen atom to the Lewis acidic Si atom of the genu...
1 CitationsSource