Spectroscopic Behaviour of Two Novel Azobenzene Fluorescent Dyes and Their Polymeric Blends

Molecules

Rosita Diana¹  Barbara Panunzi¹  Ugo Caruso²  Rafi Shikler³  Simona Concilio⁴  Stefano Piotto⁵ 

[1] Department of Agriculture, University of Napoli Federico II, NA 80055 Portici, Italy;Department of Chemical Sciences, University of Napoli Federico II, 80126 Napoli, Italy;Department of Electrical and Computer Engineering, Ben-Gurion University of the Negev, POB 653 Beer-Sheva 84105, Israel;Department of Industrial Engineering, University of Salerno, SA 84084 Fisciano, Italy;Department of Pharmacy, University of Salerno, SA 84084 Fisciano, Italy;

关键词: azobenzene;    dye;    fluorophore;    colorant;    polymeric blend;   

DOI  :  10.3390/molecules25061368

来源: DOAJ

【 摘 要 】

Two novel symmetrical bis-azobenzene red dyes ending with electron-withdrawing or donor groups were synthesized. Both chromophores display good solubility, excellent chemical, and thermal stability. The two dyes are fluorescent in solution and in the solid-state. The spectroscopic properties of the neat crystalline solids were compared with those of doped blends of different amorphous matrixes. Blends of non-conductive and of emissive and conductive host polymers were formed to evaluate the potential of the azo dyes as pigments and as fluorophores. Both in absorbance and emission, the doped thin layers have CIE coordinates in the spectral region from yellow to red. The fluorescence quantum yield measured for the brightest emissive blend reaches 57%, a remarkable performance for a steadily fluorescent azo dye. A DFT approach was employed to examine the frontier orbitals of the two dyes.

【 授权许可】

Unknown