Abstract
In this study, electronic, optical and spectroscopic FT-IR, UV properties of new synthesized Schiff base hydrazone derivatives, 1-(4-nitrophenyl)-2-(4-phenoxybenzylidene)hydrazone and 1-(2,4-dinitrophenyl)-2-(4-phenoxybenzylidene)hydrazone are investigated by performing solution techniques and theoretical calculations. Solvatochromism and solute-solvent interactions were discussed based on the spectral results. It is observed that Schiff base hydrazone derivatives exhibit positive solvatochromism. Energy band gap Eg is determined experimentally and theoretically in solution. Concentration effect on Eg was investigated in DCM solvent for different molarities of solute. It is observed that solvent and concentration can be used for tuning Eg. NO2 substituent group gives rise to Eg value lows 0.3 eV. The refractive index (n) values were obtained from Moss, Ravindra, Hervé-Vandamme, Kumar-Singh and Reddy relations based on Eg data. It is observed that n can be controlled with solvents and concentration of solutions. External electric field (EF) is theoretically applied in order to tuning HOMO-LUMO gap and dipole moment. Consequently, Schiff base hydrazone derivatives intend to be insulator under applied EF.
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