Spectroscopic, cyclic voltammetric and biological studies of transition metal complexes with mixed nitrogen–sulphur (NS) donor macrocyclic ligand derived from thiosemicarbazide

Synthesis and Spectral Investigation of Co(II), Ni(II), Cu(II) and Zn(II) Complexes with Novel N4 Ligands

“…The observed trend of g > g indicates that the unpaired electron is present in the dx2-y2 orbital and the ground state is 2 B1g. This suggests that there is considerable mixing of ground and excited state terms and this is also evident from the observed magnetic moment values which are slightly greater than the spin-only value for Cu(II) ion, i.e., 1.73 B. M. This also suggests that the Cu(II) complexes are mononuclear without any Cu(II)-Cu(II) interactions [47,48].…”

“…The signals corresponding to -NH and -NH2 group protons have shifted to low field side indicating that the nitrogen atoms are coordinated to the metal ion [29,47]. The 1 H NMR spectra of Zn(II) complexes of APMED and APMPD show one new absorption at 3.56 and 3.83 ppm respectively which may be assigned to the protons of the water molecules held in the lattice.…”

Transition metal complexes with N, S donor ligands as synthetic antioxidants: Synthesis, characterization and antioxidant activity

“…During the recent years transition metal complexes with N, S donor ligands have attracted considerable interest because of their encouraging antibacterial and antifungal [1][2][3][4] activities than those of the parent ligands. Thiosemicarbazones are well established as an important class of sulfur donor ligands particularly for transition metal ions.…”

Synthesis, Thermal Behavior, and Antimicrobial Activity of a Novel Macrocycle and its Transition Metal Complexes Derived from Thiosemicarbazide

“…[2,3] The macrocyclic ligands play an important role in transition metal complexes due to kinetic and thermodynamic stabilities. [4,5] Interest in synthetic macrocycles derived from Schiff base is growing due to their wide applications in catalysts, radiopharmaceuticals, and magnetic-imaging reagents. [6] They provide an environment of controlled geometry and ligand field strength to the metal ions.…”

“…The electronic spectral bands of the complex possessed weak absorption bands at 17610, 24572, and 28655 cm À1 . These bands were assigned to 4 T 1g (4G) 6 A 1g , 4 E g (4G) 6 A 1g , and 4 E g (4D) 6 A 1g , respectively. [24] This result corresponded to octahedral geometry of Mn(II) complex.…”