Synthesis and Characterization of Heteronuclear Copper(II)-Lanthanide(III) Complexes of N,N′-1,3-Propylenebis(Salicylaldiminato) Where Lanthanide(III) = Gd or Eu

Abstract

Three complexes, namely, [Cu(salbn)] (1), [Cu(salbn)Gd(NO 3 ) 3 ⋅H 2 O] (2), and [Cu(salbn)Eu(NO 3 ) 3 ⋅H 2 O] (3) where salbn = N,N -1,3-propylenebis (salicylaldiminato) have been synthesized and characterized by elemental analyses, ICP-AES, IR, UV, NMR, MS, EDX, powder XRD, and EPR spectroscopies. The EDX results suggest the presence of two different metal ions in heteronuclear complexes (2) and (3). The ligand(salbn), complex (1), and complex (3) crystallize in triclinic system while complex (2) crystallizes in monoclinic system. The EPR studies suggest that [Cu(salbn)] complex is tetragonally coordinated monomeric copper(II) complex with unpaired electron in the 2 − 2 orbital and spectral features that are the characteristics of axial symmetry while complex (2) in DMF solution at liquid nitrogen temperature exhibits an anisotropic broad signal around g ∼ 2.03 which may suggest a weak magnetic spin-exchange interaction between Gd(III) and Cu(II) ions. The fluorescence intensity of Eu(III) decreased markedly in the complex (3).

Synthesis, computational drug likeness, DFT studies and in vitro biological activity evaluation of some heteronuclear complexes of functionalized (E)‐2‐(butan‐2‐ylidene) hydrazinecarbothioamide ligand

“…In a previous study, the same observation was made where the melting points of Cu(II)-Ln(III) containing mixed metal complexes had higher melting points than the mononuclear Cu(II) complex. [19] The decomposition temperatures and melting points were high due to the predicted neutral nature of the complexes.…”