Synthesis and transformations of pyrrolo[1,2-a][1,3,5]-triazines

New Platinum(IV) and Palladium(II) Transition Metal Complexes of s-Triazine Derivative: Synthesis, Spectral, and Anticancer Agents Studies

New Pd(II) and Pt(IV) triazine complexes [Pt₃(L¹)₂(Cl)₉(H₂O)₃].3Cl.3H₂O (1), [Pt₃(L²)₂(Cl)₉(H₂O)₃].3Cl (2), [Pt₃(L³)₂(Cl)₉(H₂O)₃].3Cl (3), [Pt₂(L⁴)₂(Cl)₆(H₂O)₂] .2Cl.4H₂O (4), [Pd₃(L¹)₂(H₂O)₆] .3Cl₂ (5), [Pd₃(L²)₂(H₂O)₆].3Cl₂ (6), [Pd₃(L³)₂(H₂O)₆].3Cl₂ (7), and [Pd₂(L⁴)₂(H₂O)₄].2Cl₂ (8) were synthesized and well characterized using elemental analyses, molar conductance, IR, UV-Vis, magnetic susceptibility, ¹H, ¹³C-NMR spectra, and thermal analyses. These analyses deduced that the L¹, L², and L³ ligands act as tridentate forming octahedral geometry with Pt(IV) metal ions and square planar geometry in case of Pd(II) complexes but the L⁴ ligand acts as bidentate chelate. The molar conductance values refer to the fact that all the prepared s-triazine complexes have electrolyte properties which are investigated in DMSO solvent. Surface morphology behaviors of prepared complexes have been scanned using TEM. The crystalline behavior of triazine complexes has been checked based on X-ray powder diffraction patterns. The antimicrobial activity of the free ligands and their platinum(IV) and palladium(II) complexes against the species Staphylococcus aureus (G+), Escherichia coli (G−), Aspergillus flavus, and Candida albicans has been carried out and compared with the standard one. The coordination of ligands towards metal ions makes them stronger bacteriostatic agents, thus inhibiting the growth of bacteria and fungi more than the free ligands. The cytotoxic assessment IC₅₀ of the free ligands and its platinum(IV) complexes in vitro against human colon and lung cancer cell lines introduced a promising efficiency.