Abstract
New N,O-hybrid ligands with methylene fragment between coordinating nitrogen and oxygen donor centers namely, dialkyl(pyridine-2-ylmethyl)phosphine oxides and dialkyl(quinoline-2-ylmethyl)phosphine oxides were synthesized. During complexation with MnCl2 pyridyl-containing dialkylphosphine oxides act as chelating N,O-bidentate ligands, while quinoline-containing dialkylphosphine oxide acts as O-monodentate ligand. All compounds were structurally characterized by mass-spectrometry, IR spectroscopy, elemental analysis, the monocrystal and powder X-ray analyses. The photoluminescence, electrochemical properties and cytotoxicity of the synthesized compounds were studied. It was found that obtained ligands and their manganese(II) complexes exhibit green–blue and blue-violet luminescence. High catalytic activity of manganese(II) complex with diisopropyl(pyridine-2-ylmethyl)phosphine oxide in HER (hydrogen evolution reaction) was found. Manganese(II) complexes based on pyridyl-containing phosphine oxides demonstrate high cytotoxic activity towards HuTu80 cancer cell line.
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