Binuclear chromium(III), manganese(III), iron(III) and cobalt(III) complexes bridged by diaminopyridine

Antibacterial activity and spectral studies of trivalent chromium, manganese, iron macrocyclic complexes derived from oxalyldihydrazide and glyoxal

“…The higher energy band at 35440-35750 cm 21 may be assigned due to charge transfer transitions. The spectra resemble to those reported for five coordinate square pyramidal manganese porphyrins [34,36]. This idea is further supported by the presence of the broad ligand field band at 20400 cm 21 diagnostic of C 4V symmetry, and thus the various bands may be assigned as follows: 5 21 and these bands do not suggest the octahedral or tetrahedral geometry around the metal atom.…”

“…Thus keeping in view, the analytical data and electrolytic nature of these complexes, a five coordinated square pyramidal geometry may be assigned for these complexes. Thus, assuming the symmetry C 4V for these complexes, [36] the various spectral bands may be assigned as: 4 21 . The higher energy band at 35440-35750 cm 21 may be assigned due to charge transfer transitions.…”

Antibacterial and antifungal studies of macrocyclic complexes of trivalent transition metal ions with their spectroscopic approach

“…On the basis of the analytical data, spectral studies, and electrolytic nature of these complexes, a five-coordinate square pyramidal geometry may be ascribed for these complexes. Thus, assuming the symmetry C 4V for these complexes [51][52][53] , the various spectral bands may be assigned as: , respectively, in order of increasing energy.…”

Sb (III) complexes derived from 5-phenyl-1H-imidazole-4- carbaldehyde and O or S containing dihydrazide with their antibacterial and spectroscopic studies

“…The 1 H NMR spectra of Schiff base ligand (HL) was recorded in d 6 -dimethylsulfoxide (DMFO-d 6 ) solution using Me 4 Si (TMS) as internal standard. The 1 H NMR spectra of the ligand shows broad signal at 9.4-12.1 ppm due to the -NH [14]. The multiplets in the region 7.54-8.76 ppm may be assigned to aromatic proton [15,17] 13 C NMR of the Schiff base ligand, the signal appeared in the region 113-158 are assigned to aromatic carbon.…”