(Oligo)aromatic species with one or two conjugated Si[double bond, length as m-dash]Si bonds: near-IR emission of anthracenyl-bridged tetrasiladiene
A series of aryl disilenes Tip Si[double bond, length as m-dash]Si(Tip)Ar (2a-c) and para-arylene bridged tetrasiladienes, Tip Si[double bond, length as m-dash]Si(Tip)-LU-Si(Tip)[double bond, length as m-dash]SiTip (3a-d) are synthesized by the transfer of the Tip Si[double bond, length as m-dash]Si...
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Published in | Dalton transactions : an international journal of inorganic chemistry Vol. 46; no. 27; pp. 8839 - 8848 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
England
11.07.2017
|
Online Access | Get full text |
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Summary: | A series of aryl disilenes Tip
Si[double bond, length as m-dash]Si(Tip)Ar (2a-c) and para-arylene bridged tetrasiladienes, Tip
Si[double bond, length as m-dash]Si(Tip)-LU-Si(Tip)[double bond, length as m-dash]SiTip
(3a-d) are synthesized by the transfer of the Tip
Si[double bond, length as m-dash]SiTip unit to aryl halides and dihalides by nucleophilic disilenides Tip
Si[double bond, length as m-dash]SiTipLi (Tip = 2,4,6-iPr
C
H
, Ar = aryl substituent, LU = para-arylene linking unit). The scope of the nucleophilic Si[double bond, length as m-dash]Si 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-Me
C
H
; Ar = Dur = 2,3,5,6-Me
C
H, X = Br or I). Bridged tetrasiladienes Tip
Si[double bond, length as m-dash]Si(Tip)-LU-Si(Tip)[double bond, length as m-dash]SiTip
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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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1477-9226 1477-9234 |
DOI: | 10.1039/c7dt00397h |