Synthesis, characterization and biological evaluation of a novel series of mixed ligand complexes of lanthanides(III) with 4[N-(furfural)amino]antipyrine semicarbazone as primary ligand and diphenyl sulfoxide as secondary ligand

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

“…The analysis of the EDX spectra indicates the presence of two kinds of different metals ions in heteronuclear complexes (2) and (3). Thus, from the EDX analysis, it can be proved that complexes (2) and (3) are heterobinuclear complex [29].…”

“…In the complex, this band is shifted to 1627 cm −1 upon complexation with the metal, which may be attributed to the coordination of the imine nitrogen to the metal centre [20][21][22][23]. The ligand shows band at 3539 cm −1 due to O-H stretching from phenolic group which disappears in the complexes (1), (2), and (3), indicating the deprotonation of the ligand upon complexation [5]. The strong phenolic C-O absorption band at 1212 cm −1 observed in the spectrum of ligand shifts to lower frequency at 1017 cm −1 , supporting the coordination of the deprotonated phenolic oxygen atoms to the metal centres in the complexes [22].…”

“…In the EPR spectrum of complex (2) in DMF solution at liquid nitrogen temperature, the fine structure exhibits the seven expected transitions around 2380, 2680, 3000, 3220, 3300, 3480, and 4000 G which may be generated by zero field splitting [17,40]. This spectrum corresponds to the superposition of the signals of the copper(II) and gadolinium(III) ions.…”

“…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 d 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 ∼ 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).…”

“…The spectroscopic and unique properties of copper(II)-lanthanide(III) complexes have become a subject of intense research interest with coordination chemists because of their wide arrays of applications in electroluminescent devices, biomedicine, MRI, magneto magnets, and many more [1][2][3][4][5]. The coordination chemistry of lanthanide(III) ions is also increasing day by day, owing to the relevance of these compounds in basic and applied research in various fields to chemistry, material science, life science, and so forth [6][7][8].…”