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Takagi, Nozomi,Yamazaki, Kentaro,Nagase, Shigeru Korean Chemical Society 2003 Bulletin of the Korean Chemical Society Vol.24 No.6
To extend the knowledge of triple bonding between group 6 transition metal and heavier group 14 elements, the structural and bonding aspects of ($η^5-C_5H_5$)$(CO)_2$M≡ER (M = Cr, Mo, W; E = Si, Ge, Sn, Pb) are investigated by hybrid density functional calculations at the B3PW91 level. Substituent effects are also investigated with R = H, Me, $SiH_3$, Ph, $C_6H_3-2,6-Ph_2$, $C_6H_3-2,6-(C_6H_2-2,4,6-Me_3)_2$, and $C_6H_3-2,6-(C_6H_2-2,4,6- iPr_3)_2$.
INTERACTION OF SINGLE-WALLED CARBON NANOTUBES WITH AMINE
YUTAKA MAEDA,MICHIO YAMADA,TADASHI HASEGAWA,TAKESHI AKASAKA,JING LU,SHIGERU NAGASE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.1
Single-walled carbon nanotubes (SWNTs) have excellent mechanical and electrical properties that have led to the proposal of many potential applications. However, SWNTs are typically grown as bundles of metallic and semiconducting tubes. This prevents their widespread application. Therefore, it is technologically critical to disperse and purify SWNTs and separate metallic and semiconducting SWNTs effectively. Recent progress and advances have been made on dispersion, separation, assemble, and control of electronic property of SWNTs by the interaction of organic molecules. This paper presents a brief review of the interaction of SWNTs with amine.
Synthesis and structure of stable 1,2-diaryldisilyne
Sasamori, Takahiro,Han, Joon Soo,Hironaka, Koji,Takagi, Nozomi,Nagase, Shigeru,Tokitoh, Norihiro De Gruyter 2010 Pure and Applied Chemistry Vol.82 No.3
<P>A novel 1,2-diaryldisilyne, BbtSi≡SiBbt (Bbt = 2,6-bis[bis(trimethylsilyl)methyl]-4-[tris(trimethylsilyl)methyl]phenyl), was synthesized as a stable compound by reduction of the corresponding 1,2-dibromodisilene, Bbt(Br)Si=Si(Br)Bbt. The spectral and structural features of this first stable 1,2-diaryldisilyne are revealed, and the Si≡Si triple-bond character is evaluated with the aid of detailed theoretical calculations. The triple-bond characters of BbtSi≡SiBbt and BbtGe≡GeBbt are compared based on experimental and theoretical results.</P>
C60(OH)n-ASSISTED DISPERSION OF SINGLE-WALLED CARBON NANOTUBES
YUTAKA MAEDA,TAKAAKI KATO,JUNKI HIGO,TADASHI HASEGAWA,TAKAHIRO KITANO,TAKAHIRO TSUCHIYA,TAKESHI AKASAKA,TOSHIYA OKAZAKI,JING LU,SHIGERU NAGASE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2008 NANO Vol.3 No.6
We demonstrate that C60(OH)n-assists the dispersion of SWNTs in aqueous and nonaqueous solutions, which effectively exfoliates large-diameter SWNTs. The SWNT dispersions are characterized by absorption and photoluminescence spectra.
TADASHI HASEGAWA,TAKESHI AKASAKA,YUTAKA MAEDA,MASAHIRO HASHIMOTO,MAKOTO KANDA,TAKAHIRO TSUCHIYA,TAKATSUGU WAKAHARA,YUHEI MIYAUCHI,SHIGEO MARUYAMA,JING LU,SHIGERU NAGASE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2007 NANO Vol.2 No.4
Single-walled carbon nanotubes (SWNTs) synthesized by catalytic decomposition of an alcohol were purified by extraction. The purified SWNTs were characterized on the basis of visible-near infrared (vis-NIR) absorption, photoluminescence and Raman spectroscopic analyses, scanning electron microscopy (SEM) observation, and thermal analysis. Selective extraction of metallic nanotubes was also achieved by the extraction condition.