Here, we report dicyanopyrazine (DPZ)-derived push–pull chromophores, easily prepared and tunable organic compounds, as new kinds of photoredox catalysts.
Synthesis and optical/thermal properties of low molecular mass V-shaped materials based on 2,3-dicyanopyrazine
作者:Rodrigo Cristiano、Eduard Westphal、Ivan H. Bechtold、Adailton J. Bortoluzzi、Hugo Gallardo
DOI:10.1016/j.tet.2007.01.045
日期:2007.3
A novel series of luminescent low molecular mass materials containing a 2,3-dicyanopyrazine central core were synthesized through an esterification reaction between diphenol 10 and different aromatic carboxylic acids 1-6, containing terminal long alkyl chains. They have a similar V-shaped geometry with lack of planarity between the two arms, confirmed by the X-ray structure of the central core. The optical and thermal properties of these compounds were evaluated. They show blue fluorescence in solution (lambda(max)(em) 440-480 nm) with quantum fluorescence yields (Phi(F)) from 0.003 to 0.1 and Stokes shifts of around 90 nm. In solid state, optical band gaps (E-g) were from 3.14 to 3.32 eV. Thin films of 11, 13, and 14 exhibited blue fluorescence (lambda(max)(em) 430-456 nm), and 12,15, and 16 (more bulky) displayed green fluorescence (lambda(max)(em) 488-512 nm). Most of the materials exhibited good thermal stability, exhibiting an amorphous glassy state after melting. Transparent amorphous films were easily obtained through spin coating and characterized by AFM analysis. (c) 2007 Elsevier Ltd. All rights reserved.
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their potential applications in photodynamic therapy. The macrocycles were obtained via Linstead macrocyclization with good yields. The expansion of the porphyrazine periphery with hyperbranched arylsubstituents was beneficial in terms of purification and isolation of compounds, effectively hampering their aggregation tendency in different concentrations. The obtained macrocycles were assessed for their