Trivalent chromium, manganese, iron and cobalt chelates of a tetradentate N6 macrocyclie ligand

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.…”

“…The presence of bands in all complexes in the region 415-465 cm 21 originate from (M-N) azomethine vibrational modes and gives idea about coordination of azomethine nitrogens [34]. The bands present at 305-325 cm 21 may be assigned due to n(M-Cl) vibrations [31,33].…”

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

“…The far infrared spectra showed bands in the region 420-445 cm −1 , corresponding to (MN) vibrations [43][44][45] . The presence of bands in all complexes in the region 420-445 cm −1 originates from (MN) azomethine vibrational modes and identifies coordination of the azomethine nitrogen 46 . The bands present in the range 300-320 cm −1 may be ascribed to the (MCl) vibration [43][44][45] .…”

Template synthesis, spectroscopic studies and biological activities of macrocyclic complexes derived from thiocarbohydrazide and glyoxal

“…The far IR spectra show bands in the region , 430 -450 cm 21 corresponding to n(M-N) vibrations [33 -35]. The presence of bands in all complexes in the 430 -450 cm 21 region originate from (M-N) azomethine vibrational modes and identify coordination of azomethine nitrogens [36]. The bands present at 300 -310 cm 21 may be assigned to n(M-Cl) vibrations [33,35].…”