Synthesis, spectral and electrochemical studies of mononuclear samarium (II), europium (II) and ytterbium (II) complexes with a NNO donor Schiff base derived from 4-methyl-2,6-dibenzoylphenol and propane-1,3-diamine

Abstract

Three mononuclear divalent lanthanide complexes, [Sm(L)2(THF)2] (1), [Eu(L)2(THF)2] (2) and [Yb(L)2(THF)2] (3), (where HLMe = 2-{N-(3-aminopropyl)benzimidoyl}-6-benzoyl-4-methylphenol) have been synthesized and characterized by elemental analyses, conductivity measurements, mass spectrometry, IR, electronic and 1H NMR spectroscopy and cyclic voltammetry. The spectral studies suggest that the LnN4O4 coordination polyhedron is a distorted dodecahedral. The electrochemical behavior of 1–3 shows irreversible metal centered oxidation wave at ca. 0.544–0.643 V and ligand centered reduction at ca. −1.085 to −1.260 V versus Ag/Ag+. Interaction of 1, 2 and 3 with calf thymus DNA suggests an intercalative binding mode.