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Showing papers by "Chizuko Kabuto published in 2010"


Journal ArticleDOI
TL;DR: In this paper, the electronic structure of a water-soluble near-infrared (NIR)-absorbing complex was determined by X-ray diffraction and 1H NMR spectroscopy.
Abstract: The electronic structure of a water-soluble near-infrared (NIR)-absorbing complex was determined to be singlet diradical [PtII(LISQ)2]2– [(LISQ)2–· = o-diiminosulfobenzosemiquinonate radical] by X-ray diffraction and 1H NMR spectroscopy. Cyclic voltammetry (CV) showed redox reactions of [PtII(LISQ)2]2– to give [PtII(LISQ)(LIBQ)]– (E1 = –0.26 V vs. Fc+/Fc) and [PtII(LISQ)(LPDI)]3– (E2 = –1.46 V) [(LIBQ)– = o-diiminosulfobenzoquinonate, (LPDI)3– = o-phenylenediiminesulfonate]. The monoradical structure of the latter was confirmed by electron paramagnetic resonance (EPR) spectroscopy. Splitting of the reduction wave of [PtII(LISQ)(LIBQ)]– in CV and the weak EPR signal suggested the formation of a dimer. Because the rest potential of the solution exceeds Epa1 at pH 4.0, the decrease in the NIR absorption at pH < 4.0 can be attributed to the oxidation of [PtII(LISQ)2]2– followed by dimerization.

12 citations


Journal ArticleDOI
TL;DR: A new acetylide−silylene complex was synthesized by the reaction of Cp*(CO)2W(NCMe)Me with Ph2HSiC≡CSiMe3 as mentioned in this paper.

10 citations



Journal ArticleDOI
TL;DR: In this article, the transannular interaction of two selenium atoms was used to generate diselena derivatives possessing 1,5,3,7-diselenadiazabicyclo[3.3.0] octane skeleton.
Abstract: Oxidation of 3,7-disubstituted 2H,6H-tetrahydro-1,5,3,7-diselenadiazocines afforded 4-substituted 1,2,4-diselenazolidines in modest yields. The intermediates of the reactions were supposed to be diselena dications possessing 1,5,3,7-diselenadiazabicyclo[3.3.0]octane skeleton generated transiently by the transannular interaction of two selenium atoms.

Journal ArticleDOI
TL;DR: In this paper, thermal cycloreversion of 6H-1,3,5-oxathiazines or 1,3-selenaza-1.3-butadienes with substitutions at the C-2 and C-4 positions was used to obtain 1,4-adducts of the heterodienes in the presence of nucleophiles.
Abstract: 1,3-Thiaza- and 1,3-selenaza-1,3-butadienes bearing several substituents at the C-2 and C-4 positions were generated through thermal cycloreversion of 6H-1,3,5-oxathiazines or 6H-1,3,5-oxaselenazines, respectively, and the heterodienes were efficiently trapped by using acetylenic dienophiles. When 6H-1,3,5-oxathiazines or 6H-1,3,5-oxaselenazines were heated in the presence of nucleophiles, such as alcohols or thiols, the corresponding 1,4-adducts of the heterodienes with the nucleophiles were obtained in good yields. On the other hand, heating of 6H-1,3,5-oxathiazines or 6H-1,3,5-oxaselenazines in the absence of trapping agents afforded several products which originated from the in situ generated 1,3-chalcogenaza-1,3-butadienes; also the heterodienes were not isolated or observed directly as the monomeric forms at all.

Journal ArticleDOI
TL;DR: In this article, the 1,3-diselenetane rings of the products caused cycloreversion by heating to generate 2-methylene-3-cyclobutene-1-selones and the selones were trapped with diene to give [4+2] cycloadducts.
Abstract: Heating of alkynyl propargyl selenides afforded a stereoisomeric mixture of 5,10-diselenadispiro[3.1.3.1]deca-1,7-dienes. The 1,3-diselenetane rings of the products caused cycloreversion by heating to generate 2-methylene-3-cyclobutene-1-selones and the selones were trapped with diene to give [4+2] cycloadducts.