Synthesis and molecular structure of platinum(II) complexes with cyclotriphosphazenes containing pyridylalkylamino and pyridylmethoxy groups

Abstract

The interaction of platinum(II) nitrile complexes with polydentate ligands, pentaphenoxy(2-pyridylmethylamino)cyclotriphosphazene (L1), pentaphenoxy(3-pyridylmethylamino)cyclotriphosphazene (L2), pentaphenoxy[2-(2-pyridyl)ethylamino]cyclotriphosphazene (L3), and pentaphenoxy(2-pyridylmethoxy)-cyclotriphosphazene (L4), was studied. The synthesized complexes were characterized by single-crystal X-ray diffraction, 1H and 31P NMR spectroscopy, IR spectroscopy, FAB mass spectrometry, and other methods. In complexation of phosphazenes L1-L3 with Pt(II) ions, nitrogen atoms of the pyridine ring and alkylamine fragment participate in the coordination to form chelate rings. In the complex with L4, the substituted phosphazene is coordinated via nitrogen atoms of the pyridyl group and cyclotriphosphazene ring to form a sevenmembered ring.