A spectroscopic exploration of the influence of charge donor group on ESIPT process and its consequences in a salicylimine

作者：Makhal Subhash Chandra; Bhattacharyya Arghyadeep; Ghosh Soumen; Guchhait Nikhil^*

来源：Journal of Photochemistry and Photobiology A: Chemistry , 2018, 358: 138-146.

DOI：10.1016/j.jphotochem.2018.03.010

• 1-[1-(4,6-dimethylpyrimidine-2-y1)-hydrazonomethyl]-4-diethylamino-2-phe nol (DYMDAP)
• ESIPT
• Fluorescence spectroscopy
• DFT

Photophysical properties of a newly designed synthetic compound DYMDAP have been investigated in combination with computational calculations. DYMDAP shows a solvent dependent emissive behavior which in non-polar solvents shows two distinct peaks along with a shoulder but with increasing polarity as also proticity of the solvents the intensity of each band varies significantly. Along with the two bands, a new band is observed in polar protic solvent due to the proton transfer (PT) in the excited state of the compound. Only in polar protic solvents, intensity of the PT band increases significantly whereas in non polar or polar aprotic medium intensity is sparse. By comparing the spectral observations of DYMDAP with two control compounds DYMP and DYMDAB the proton transfer process is assigned to be due to solvent mediated and the proton transfer process is enhanced by the presence of charge transfer moiety.

• 出版日期2018-5-1