Background/Objectives: Biofilm-associated infections, particularly those involving Candida auris and Staphylococcus aureus, pose significant challenges in clinical settings due to their resilience and resistance to conventional treatments. This study aimed to synthesize novel triazole derivatives containing a piperazine ring via click chemistry and evaluate their efficacy in disrupting biofilms formed by these pathogens. Methods: Triazole derivatives were synthesized using click chemistry techniques. The antimicrobial activity of the compounds was tested against planktonic cells of C. auris and S. aureus in single and dual-species culture conditions. Biofilm disruption efficacy was assessed, alongside the evaluation of physicochemical properties, oral bioavailability potential, and toxicity profiles. Results: The compound T3 demonstrated potent antimicrobial activity against planktonic cells of C. auris and S. aureus in both single and dual-species cultures. T3 exhibited significant efficacy in reducing microbial viability within biofilms formed by these pathogens. Physicochemical analyses revealed favorable solubility and permeability profiles, supporting its potential for oral bioavailability. Toxicity assessments showed a non-toxic profile, highlighting a promising safety margin for further development. Conclusions: This study underscores the anti-biofilm properties of novel triazole-piperazine derivatives, particularly T3, against single and dual-species biofilms of C. auris and S. aureus. These findings position T3 as a promising candidate for developing therapies targeting polymicrobial infections and provide a foundation for future research into alternative strategies for combating biofilm-associated infections.

Critical advances in the total synthesis of coumarin-based natural products are highlighted, emphasizing catalytic and biomimetic strategies, step economy, overall efficiency, and key synthetic challenges in complex coumarin framework construction.

Density functional theory (DFT) calculations were performed to investigate the electronic effects of C6 substitution on the nicotinamide (NA) scaffold. Geometry optimizations, frontier molecular orbital analysis, conceptual DFT descriptors, and molecular electrostatic potential (MEP) analyses were employed to establish structure–property relationships for selected electron-donating (CH ₃ and NH ₂ ) and electron-withdrawing (NO ₂ ) substituents. The electronic properties of NA were strongly influenced by substituent character. The weak electron-donating CH ₃ group induced only minor changes relative to the parent molecule, whereas the NH ₂ and NO ₂ substituents produced noticeable variations in frontier orbital energies, dipole moments, and charge distribution. Among the investigated derivatives, the NO ₂ -substituted system exhibited the smallest HOMO–LUMO gap, the highest dipole moment, and the highest electrophilicity, indicating enhanced charge separation and electron-accepting ability. Qualitative MEP analysis, further supported by the molecular polarity index (MPI), confirmed substituent-dependent redistribution of electrostatic potential across the molecular surface. Overall, the combined analyses demonstrate that C6 substitution provides a systematic approach for tuning the electronic structure of nicotinamide and establish consistent structure–property relationships that may facilitate the rational design of related functional derivatives.

The world stands at a critical energy crossroads. While renewable energy capacity grows exponentially, our ability to store, convert, and utilize this energy efficiently still depends on breakthroughs in materials science. This chapter isn't just about promising lab results – it's about real-world solutions that must balance scientific innovation with engineering pragmatism and industrial realities. Furthermore, the world is racing toward an energy revolution, but the path isn't as simple as swapping fossil fuels for solar panels and batteries. Behind every headline about a “breakthrough” material, there's a messy, often untold story of trial, error, and real-world constraints. This chapter isn't just about the science of energy materials—it's about the people behind them, the frustrations they face, and the hard-won lessons that separate lab-scale promise from industrial reality.