849727-75-9Relevant articles and documents
Highly fluorescent solid-state asymmetric spirosilabifluorene derivatives
Lee, Sang Ho,Jang, Bo-Bin,Kafafi, Zakya H.
, p. 9071 - 9078 (2005)
A series of four asymmetrically aryl-substituted 9,9′-spiro-9- silabifluorene (SSF) derivatives, 2,2′-di-tert-butyl-7,7′-diphenyl- 9,9′-spiro-9-silabifluorene (PhSSF), 2,2′-di-tert-butyl-7,7′- dipyridin-2-yl-9,9′-spiro-9-silabifluorene (PySSF), 2,2′-di-tert- butyl-7,7′-dibiphenyl-4-yl-9,9′-spiro-9-silabifluorene (BPhSSF), and 2,2′-di-tert-butyl-7,7′-bis(2′,2″-bipyridin-6-yl)-9, 9′-spiro-9-silabifluorene (BPySSF) are prepared through the cyclization of the corresponding 2,2′-dilithiobiphenyls with silicon tetrachloride. These novel spiro-linked silacyclopentadienes (siloles) form transparent and stable amorphous films with relatively high glass transition temperatures (Tg = 203-228°C). The absorbance spectrum of each compound shows a significant bathochromic shift relative to that of the corresponding carbon analogue as a result of the effective σ*-π* conjugation between the σ* orbital of the exocyclic Si-C bond and the π* orbital of the oligoarylene fragment. Solid-state films exhibit intense violet-blue emission (λPL = 398-415 nm) with high absolute photoluminescence quantum yields (ΦPL = 30-55%).
