Molecular alignment effects on spectroscopic properties 2,1,3-benzothiadiazole guested in liquid-crystalline compounds

作者：Alliprandini Filho P; Borges G F; Calixto W B; Bechtold I H; Vieira A A; Cristiano R; Gallardo H; Silva R A; Barbosa Neto N M; Marletta Alexandre

来源：Chemical Physics Letters, 2010, 487(4-6): 263-267.

DOI：10.1016/j.cplett.2010.01.031

This Letter reports about the molecular alignment effects on absorbance and emission properties of a new compound based on 2,1,3-benzothiadiazole guested in liquid crystals. The molecular ordering is available for different chromophore concentrations. Despite of the increasing in molecular disorder above the concentration of 0.20%, samples always present a high degree of linear polarization in fluorescence. A considerable amount of polarized emission is observed during the isotropic phase (T > 58 degrees C), which is attributed to emission of light by aligned molecules before loosing the coherence among them. Finally, we demonstrate the feasibility of ellipsometry technique to investigate phase transitions in fluorescent systems.

• 出版日期2010-3-5