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Two penta-coordinated [Co( Morph BPT)Cl 2 ] ; 1 and [Co( Pip BPT)Cl 2 ] ; 2 complexes with the bis -pyrazolyl- s -triazine pincer ligands  Morph BPT and  Pip BPT were synthesized and characterized. Both  Morph BPT and  Pip BPT act as NNN-tridentate pincer chelates coordinating the Co(II) center with one short Co-N( s -triazine) and two longer Co-N(pyrazole) bonds. The coordination number of Co(II) is five in both complexes, and the geometry around Co(II) ion is a distorted square pyramidal in 1, while 2 shows more distortion. In both complexes, the packing is dominated by Cl…H, C-H…π, and Cl…C (anion-π stacking) interactions in addition to O…H interactions, which are found only in 1 . The UV-Vis spectral band at 564 nm was assigned to metal-ligand charge transfer transitions based on TD-DFT calculations. Complexes 1 and 2 showed higher antimicrobial activity compared to the respective free ligand  Morph   BPT and  Pip BPT, which were not active. MIC values indicated that 2 had better activity against S. aureus, B. subtilis , and P. vulgaris than 1 . DPPH free radical scavenging assay revealed that all the studied compounds showed weak to moderate antioxidant activity where the nature of the substituent at the s -triazine core has a significant impact on the antioxidant activity.

molecules/molecules online/molecules annual

Syntheses and Structural Investigations of Penta-Coordinated Co(II) Complexes with Bis-Pyrazolo-S-Triazine Pincer Ligands, and Evaluation of Their Antimicrobial and Antioxidant Activities