Fluorescence property and solvent effect on m-bromosalicylaldehyde derivative; insights from synthesis, characterization, antimicrobial activity and computational studies

The Schiff base was synthesized using the m-bromosalicylaldehyde and ethylenediamine in 1:1 mole ratio. Using the infrared, UV, fluorescence and ¹H-¹³CNMR spectral analysis the m-bromosalicylaldehyde derivative structure was confirmed. Using DFT study the compound structure was optimized. Local energy decomposition (LED) analysis calculated binding energy is -9.19 kcal/mol. The molecule 5BRSET is a optical material, its wavelength is 512 nm and 784 nm respectively. We used three different solvents to calculate the non-linear optical, HOMO-LUMO and molecular electrostatic potential studies, when compared to other solvent the water is showed good activity. Using topological analysis we confirms the localization and delocalization electrons from the synthesized compound. The non-covalent interaction study confirms the intermolecular and intermolecular hydrogen bondings. The natural bond orbital analysis calculation showed the interactions between and within the molecule. A docking study was done on the molecule, and the results show that 5BRSET interacts well with the crystal structure of hypothetical protein (PDB ID: 2EA9). The molecule is moderate activity, which is confirmed by antimicrobial activity.