Browsing by Author "Tsai, Yi-Chou"
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Item type:Item, A three-coordinate and quadruply bonded Mo-Mo complex(2006-11-01) ;Tsai, Yi-Chou ;Lin, Yang-Miin ;Yu, Jen-Shiang K. ;Hwang, Jenn-Kang生物科技學系Item type:Item, An Electron-Rich Molybdenum-Molybdenum Quintuple Bond Spanned by One Lithium Atom(2012) ;Liu, Shin-Cheng ;Ke, Wei-Lun ;Yu, Jen-Shiang K. ;Kuo, Ting-ShenTsai, Yi-ChouItem type:Item, Eclipsed digermylenes as building blocks to construct catenated multinuclear germanium chains and rings(2019-08-25) ;Wey, Yu-Te ;Huang, Guo-Tao ;Yu, Jen-Shiang ;Tsai, Yi-Chou生物科技學系Item type:Item, Journey from Mo-Mo Quadruple Bonds to Quintuple Bonds(2009-09-09) ;Tsai, Yi-Chou ;Chen, Hong-Zhang ;Chang, Chie-Chieh ;Yu, Jen-Shiang K.Lee, Gene-HsiangHeating K(4)Mo(2)Cl(8) and 2 equiv of Li[RC(NDipp)(2)] (R = H, Ph; Dipp = 2,6-i-Pr(2)C(6)H(3)) in tetrahydrofuran (THF) at 60 degrees C gives two paddlewheel type quadruply bonded dimolybdenum complexes, Mo(2)(mu-Cl)[Cl(2)Li(OEt(2))][mu-eta(2)-RC(N-2,6-i-Pr(2)C(6)H(3))(2)](2) (R = H (1), Ph (2)). The Mo-Mo bond lengths of 1 and 2 are 2.0875(4) and 2.0756(8) angstrom, respectively, indicating typical Mo-Mo quadruple bonds. Reduction of 1 and 2 by two electrons results in the isolation of their corresponding Mo-Mo quintuple bonded complexes, Mo(2)[mu-eta(2)-RC(N-2,6-i-Pr(2)C(6)H(3))(2)](2) (R = H (3), Ph (4)), and the Mo-Mo bond lengths dramatically decrease to 2.0187(9) angstrom (3) and 2.0157(4) angstrom (4), a consequence of the formation of the second delta bond and representing the shortest metal-metal bonds beyond the first row elements. The Mo-Mo quintuple bonding characters are corroborated by DFT calculations at the level of BP86/def2-TZVP and BP86/def2-TZVPP.Item type:Item, Quintuply-Bonded Dichromium(I) Complexes Featuring Metal-Metal Bond Lengths of 1.74 angstrom(2008) ;Hsu, Chia-Wei ;Yu, Jen-Shiang K. ;Yen, Chun-Hsu ;Lee, Gene-HsiangWang, YuItem type:Item, Reactions of Metal-Metal Quintuple Bonds with Alkynes: [2+2+2] and [2+2] Cycloadditions(2012) ;Chen, Hong-Zhang ;Liu, Shih-Cheng ;Yen, Chun-Hsu ;Yu, Jen-Shiang K.Shieh, Yun-JenItem type:Item, Remarkably short metal-metal bonds: A lantern-type quintuply bonded Dichromium(I) complex(2008) ;Tsai, Yi-Chou ;Hsu, Chia-Wei ;Yu, Jen-Shiang K. ;Lee, Gene-HsiangWang, YuItem type:Item, Reversible Cleavage/Formation of the Chromium-Chromium Quintuple Bond in the Highly Regioselective Alkyne Cyclotrimerization(2017-11-27) ;Huang, Yu-Siang ;Huang, Gou-Tao ;Liu, Yao-Lun ;Yu, Jen-Shiang K.Tsai, Yi-ChouHerein we report the employment of the quintuply bonded dichromium amidinates [Cr{(2)-HC(N-2,6-(Pr2C6H3)-Pr-i)(N-2,6-R2C6H3)}](2) (R=iPr (1), Me (7)) as catalysts to mediate the [2+2+2] cyclotrimerization of terminal alkynes giving 1,3,5-trisubstituted benzenes. During the catalysis, the ultrashort Cr-Cr quintuple bond underwent reversible cleavage/formation, corroborated by the characterization of two inverted arene sandwich dichromium complexes (-(6):(6)-1,3,5-(Me3Si)(3)C6H3)[Cr{(2)-HC(N-2,6-(Pr2C6H3)-Pr-i)(N-2,6-R2C6H3)}](2) (R=Pr-i (5), Me (8)). In the presence of sigma donors, such as THF and 2,4,6-Me3C6H2CN, the bridging arene 1,3,5-(Me3Si)(3)C6H3 in 5 and 8 was extruded and 1 and 7 were regenerated. Theoretical calculations were employed to disclose the reaction pathways of these highly regioselective [2+2+2] cylcotrimerization reactions of terminal alkynes.Item type:Item, Stepwise Construction of the Cr-Cr Quintuple Bond and Its Destruction upon Axial Coordination(2012) ;Huang, Yu-Lun ;Lu, Duan-Yen ;Yu, Hsien-Cheng ;Yu, Jen-Shiang K.Hsu, Chia-WeiItem type:Item, Structural transformations in dinuclear zinc complexes involving Zn-Zn bonds(2007) ;Tsai, Yi-Chou ;Lu, Duan-Yen ;Lin, Yang-Miin ;Hwang, Jenn-KangYu, Jen-Shiang K.Reduction of Zn-2(mu-eta(2)- Me2Si( NDipp)(2))(2) with 4 equiv. of KC8 resulted in a dramatic structural transformation into [(eta(2)- Me2Si( NDipp)(2)) ZnZn(eta(2)- Me2Si( NDipp)(2))](2-) featuring a Zn - Zn bond instead of [Zn-2(mu-eta(2)- Me2Si( NDipp)(2))(2)](2-); the mechanism of the observed structural transformations arising from the Zn - Zn bond formation involving the intermediate of [Zn-2(mu-eta(2)- Me2Si( NDipp)(2))(2)](-) was elucidated by elaborate computations.Item type:Item, Syntheses and structures of low-coordinate and multiply-bonded M-M complexes(2007-03-25) ;Tsai, Yi-Chou ;Lin, Yang-Miin ;Yu, Jen-Shiang K. ;Hwang, Jenn-Kang生物科技學系Item type:Item, Theory-Guided Experiments on the Mechanistic Elucidation of the Reduction of Dinuclear Zinc, Manganese, and Cadmium Complexes(2011) ;Lu, Duan-Yen ;Yu, Jen-Shiang K. ;Kuo, Ting-Shen ;Lee, Gene-HsiangWang, Yu