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Fluorescent benzene-centered mono-, bis- and tris-triazapentadiene-boron complexes.
- Source :
-
Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2015 May 28; Vol. 44 (20), pp. 9659-71. - Publication Year :
- 2015
-
Abstract
- A series of novel benzene centered mono-, bis- and tris-1,3,5-triazapentadiene ligands was synthesized and investigated with respect to their reactivity towards triphenylborane. The resulting blue-fluorescent boron complexes with a six-membered ring chelate structure show excellent thermal and chemical stability. All title compounds were completely characterized including X-ray diffraction studies for and . Whereas the absorption spectra of all three classes of compounds are similar, the fluorescence spectra show distinct differences. Thus, the emission spectra of show Stokes shifts of 4100-6700 cm(-1) with low quantum yields both in solution and in the solid state. However, the more bulky compounds show markedly larger molar extinction coefficients and smaller bathochromic shifts compared to . For all compounds, we observe significantly more intense red-shifted fluorescence in the solid state compared to that in dichloromethane solutions. For the interpretation of the absorption properties TD-DFT studies were performed based on DFT geometry optimizations.
Details
- Language :
- English
- ISSN :
- 1477-9234
- Volume :
- 44
- Issue :
- 20
- Database :
- MEDLINE
- Journal :
- Dalton transactions (Cambridge, England : 2003)
- Publication Type :
- Academic Journal
- Accession number :
- 25924222
- Full Text :
- https://doi.org/10.1039/c5dt00908a