Compounds of Group 14 Elements with an Element鈥揈lement (E = Si, Ge, Sn) Bond: Effect of the Nature of the Element Atom

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• 作者：Kirill V. Zaitsev ; Elmira Kh. Lermontova ; Andrei V. Churakov ; Viktor A. Tafeenko ; Boris N. Tarasevich ; Oleg Kh. Poleshchuk ; Anastasia V. Kharcheva ; Tatiana V. Magdesieva ; Oleg M. Nikitin ; Galina S. Zaitseva ; Sergey S. Karlov
• 刊名：Organometallics
• 出版年：2015
• 出版时间：June 22, 2015
• 年：2015
• 卷：34
• 期：12
• 页码：2765-2774
• 全文大小：589K
• ISSN：1520-6041

文摘

Two series of germanium compounds, (p-Tol)₃Ge-MMe₃ (M = Si (1), Ge (2), Sn (3)) and (Me₃Si)₃Ge-MPh₃ (M = Ge (4), Sn (5)), were prepared using lithium or potassium intermediates. The changing of the reaction conditions results in trigermane Ph₃Ge-Ge(SiMe₃)₂-GePh₃ (6). The molecular structures of 1, 2, and 6 were investigated by X-ray analysis. By UV/visible spectroscopy it is established that introduction of a tin atom results in a significant bathochromic absorption shift. Furthermore, according to cyclic voltammetry, oxidation potentials decrease in the order 1 > 2 > 3. The electronic structures of 1鈥?b>4 and related (Me₃Si)₃Ge-SiPh₃ were investigated by DFT calculations. Fluorescence properties of 1鈥?b>3 were studied in the solid state and in solution; for compound 3 phosphorescence (lifetime is 4.58 ms) is observed in the solid state.