Luminescent Complexes of Zn(II) and Cd(II) with Chiral Ligands Containing 1,10-Phenanthroline and Natural Monoterpenoids (+)-3-Carene or (+)-Limonene Fragments

Resumo

New chiral 1,10-phenanthroline-derived ligands containing fragments of (+)-3-carene (L¹) and (+)-limonene (L2) natural monoterpenoids and their complexes Zn(L^1,2)Cl₂·1.5H₂O, Cd(L^1,2)Cl₂·nH₂O, Zn(L¹)Br₂·2H₂O, and Cd(L1)Br2·2H2O were synthesized. According to NMR and IR spectroscopy data, a conclusion was made about the polynuclear structure of the compounds obtained. Luminescent properties of the compounds obtained were investigated. Lifetimes of the excited states and luminescence quantum yields (φ_f) were determined. For free ligands, blue fluorescence was observed. In the case of Zn(II) and Cd(II) complexes, luminescence appeared in the green region of the spectrum.