Enhanced 蟺-Conjugation and Emission via Icosahedral Carboranes: Synthetic and Spectroscopic Investigation

详细信息    查看全文

• 作者：Barada Prasanna Dash ; Rashmirekha Satapathy ; Elizabeth R. Gaillard ; Kathleen M. Norton ; John A. Maguire ; Neha Chug ; Narayan S. Hosmane
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：June 20, 2011
• 年：2011
• 卷：50
• 期：12
• 页码：5485-5493
• 全文大小：1018K
• 年卷期：v.50,no.12(June 20, 2011)
• ISSN：1520-510X

文摘

The ability of ortho-, meta- and para-carboranes to enhance the emission intensity has been compared. For this purpose a series of carborane-appended 1,3,5-triphenylbenzene (TB) and 1,3,5- tris(biphenyl-4-yl)benzene (TBB) containing three ortho-, meta- and para-carborane clusters directly attached to the conjugated cores have been synthesized employing Suzuki, Heck, and trimerization reactions. The incorporation of the icosahedral carboranes was associated with a red shift in the UV absorption spectrum of up to 13 nm as well as enhancements of the emission intensities of up to 154%. The presence of ortho-carboranes showed the maximum red shift in the UV spectrum whereas the maximum enhancement of the emission intensity was observed in the presence of meta-carborane clusters. The order of 蟺-conjugation extension is found to be ortho > meta 鈮?para. A comparative thermal analysis indicated o-carborane-appended trimers to be the most thermally stable in the series. Proton NMR spectra of reported carborane-appended trimers indicated that ortho- and meta-carborane cages have benzenelike characteristics.