Synthesis, X-ray Structure, Hirshfeld Analysis of Biologically Active Mn(II) Pincer Complexes Based on s-Triazine Ligands

Herein, the synthesis and antimicrobial activities of [Mn((BPT)-B-Morph)(H2O)(2)NO3]NO3; (1) and [Mn((BPT)-B-Pip)(H2O)(2)NO3]NO3; (2) complexes of the pincer-type tridentate ligands (BPT)-B-Morph; 4-(4,6-di(1H-pyrazol-1-yl)-1,3,5-triazin-2-yl)morpholine and (BPT)-B-Pip; 2-(piperidin-1-yl)-4,6-di(1H-pyrazol-1-yl)-1,3,5-triazine are presented. Both complexes have slightly distorted octahedral coordination geometry. Their molecular packing depends on O-H center dot center dot center dot O, C-H center dot center dot center dot O hydrogen bonds and anion-pi stacking contacts. Hirshfeld analysis was used to quantify the different contacts. Both complexes exhibited better anti-fungal activity than the standard Fluconazole and comparable antibacterial activity to Gentamycin against Staphylococcus aureus and Escherichia coli microbes. Moreover, complexes 1 and 2 are biologically more active than the free ligands against these microbes.