(Oligo)aromatic species with one or two conjugated Si[double bond, length as m-dash]Si bonds: near-IR emission of anthracenyl-bridged tetrasiladiene.

(Oligo)aromatic species with one or two conjugated Si[double bond, length as m-dash]Si bonds: near-IR emission of anthracenyl-bridged tetrasiladiene.
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具有一个或两个共轭 Si[双键,长度为中划线]Si 键的(低聚)芳香族物质:蒽基桥联四硅二烯的近红外发射

DOI:
10.1039/c7dt00397h
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发表时间:
2017
影响因子:
4
通讯作者:
D. Scheschkewitz
D. Scheschkewitz
中科院分区:
化学2区
文献类型:
--
作者:
N. Obeid;L. Klemmer;D. Maus;M. Zimmer;J. Jeck;I. Bejan;A. J. P. White;V. Huch;G. Jung;D. Scheschkewitz

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通过亲核二硅烯 Tip2SiSiTipLi (Tip = 2,4,6-iPr3C6H2,Ar = 芳基取代基,LU = 对亚芳基连接单元)。亲核 SiSi 转移反应的范围被证明还包括具有相当大空间体积的底物,例如异亚丙基或硬基卤化物 Ar–X(Ar = Mes = 2,4,6-Me3C6H2;Ar = Dur = 2,3,5,6-Me4C6H,X = Br 或 I)。具有更多扩展连接单元的桥连四硅二烯 Tip2SiSi(Tip)–LU–Si(Tip)SiTip2 令人惊讶地在室温下表现出荧光,尽管很弱。 DFT 计算表明激发态的部分电荷转移特性是一种可能的解释。
A series of aryl disilenes Tip2SiSi(Tip)Ar (2a–c) and para-arylene bridged tetrasiladienes, Tip2SiSi(Tip)–LU–Si(Tip)SiTip2 (3a–d) are synthesized by the transfer of the Tip2SiSiTip unit to aryl halides and dihalides by nucleophilic disilenides Tip2SiSiTipLi (Tip = 2,4,6-iPr3C6H2, Ar = aryl substituent, LU = para-arylene linking unit). The scope of the nucleophilic SiSi transfer reaction is demonstrated to also include substrates of considerable steric bulk such as mesityl or duryl halides Ar–X (Ar = Mes = 2,4,6-Me3C6H2; Ar = Dur = 2,3,5,6-Me4C6H, X = Br or I). Bridged tetrasiladienes Tip2SiSi(Tip)–LU–Si(Tip)SiTip2 with more extended linking units surprisingly exhibit fluorescence at room temperature, albeit weak. DFT calculations suggest that partial charge transfer character of the excited state is a possible explanation.
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