A novel phenanthroimidazole derivative with p-type conductivity was prepared and fabricated as a heterostructure, exhibiting a negative differential resistance and photodiode properties.

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The novel compounds bearing 1,3,4‐thiadiazole moiety were obtained and their structures were identified using FT‐IR, NMR methods, elemental, and mass analysis. UV‐Vis and fluorescence spectra were obtained in six different polarity solvents. In addition, antimicrobial, antibiofilm, and the efflux pump inhibiting activities of the new compounds on K. pneumoniae, methicillin‐resistant S. aureus (MRSA), E. coli, and C. albicans were investigated. Furthermore, druglikeness and ADMET properties of the compounds were determined. As a result, it was observed that some of the derivatives presented antimicrobial activity against K. pneumoniae, S. aureus, and C. albicans. But the MBC/MFC test showed that all the activities were bacteriostatic. In addition, these derivatives have the potential of using both inhibiting and activating biofilm formation depending on the concentration. 1,3,4‐thiadiazole derivatives also presented good efflux pump inhibition in K. pneumoniae and E. coli. ADMET tests showed that 1,3,4‐thiadiazole derivatives have the potential of being used as therapeutic compounds.

Thanks to their chemical, thermal, photophysical, and photochemical properties, phenanthroimidazole derivative compounds attract attention in optoelectronic device technology, especially in OLEDs. For this reason, phenanthroimidazole derivatives are the most promising compounds for these applications in the future. In this study, the -diCl bearing phenanthroimidazole compound was synthesized, characterized, and investigated in detail the photophysical and aggregation properties. Spectroscopic studies for its characterization used 1 H-NMR, ATR-IR, and detailed LCMS-MS (mass and product ion scan). The absorption and emission spectra of diCl-PHN have been recorded with solvents of different polarities at room temperature. diCl-PHN exhibit high fluorescence quantum yield in DMSO with 0.78. CIE chromaticity diagram results of diCl-PHN were obtained and displayed good intensity. Additionally, aggregation properties were recorded at seven different water concentrations (water/DMSO %). With the results obtained from the study, it was concluded that this phenanthroimidazole derivative compound is a suitable molecule for fluorescent applications.

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