Synthesis and solution structures of some platinum(II) complexes containing chelating safrole and amine

Abstract

Reaction of the dinuclear chelate ring complex [Pt₂Cl₂(Saf-1H)₂], Saf-1H: deprotonated safrole, with various amines afforded cis-[Pt(Saf-1H)(Am)Cl], Am: NH₃ (1), Me₂NH (2), Et₂NH (3), morpholine (4), cyclohexylamine (5), benzylamine (6), aniline (7), o-toluidine (8), m-toluidine (9), p-toluidine (10), pyridine (11), 2-aminopyridine (12), and quinoline (13). The ¹H NMR and nuclear overhauser effect spectroscopy (NOESY) spectra of the reported complexes were accurately analyzed. NOESY spectra show that the complexes have a cis-configuration, in which the alkyl and aryl groups of coordinated amines are in proximity to the allyl group of chelating safrole. Complexes 11, 12, and 13 exhibit inhibitory activities on human cancer cells HepG2 and Lu with IC₅₀ = 2.5–5.0 µg mL⁻¹.

Keywords:

• Platinum(II) complex
• Safrole
• trans Effect
• ¹H NMR

Acknowledgments

This work was supported by Vietnam National Foundation for Science and Technology Development (NAFOSTED).