Spectroscopic studies on Co(II), Ni(II), Cu(II) and Zn(II) complexes with a N4-macrocylic ligands

Unsymmetrical Schiff Base Functionalized as Monobasic Tridentate Ligand on Complexation with Some Transition Metal Ions

“…The molecular ion peaks of Cu(II), Co(II), Ni(II) and Mn(II)-Ligand complexes were observed respectively at 345, 343, 340 and 330 m/z which confirm the stoichiometry of the metal complexes to be [M(L)(X)] nH 2 O. All the synthesized complexes containing metal ion were confirmed by good agreement between the observed and calculated molecular formula 13 . Elemental analysis values are in close agreement with the values calculated from molecular formulas assigned to these complexes, which is further supported by the TOF-mass studies.…”

Coordination Modes of a Schiff Base Pentadentate Derivative of 4-Aminoantipyrine with Cobalt(II), Nickel(II) and Copper(II) Metal Ions: Synthesis, Spectroscopic and Antimicrobial Studies

“…However, the band corresponding to the C=O group (amide I) remains almost unchanged on complexation, which indicates that the carbonyl group oxygen atom is not involved in coordination. This discussion suggests that the ligand coordinates to metal atom in quinquedentate fashion (NNSNN) [ 17 , 18 , 19 , 20 , 21 ].…”

Antifungal and Spectral Studies of Cr(III) and Mn(II) Complexes Derived from 3,3′-Thiodipropionic Acid Derivative

“…On coordination, this band shows a negative shift, which is in further support of coordination of the NH group through nitrogen. However, the amide I band does not show any considerable change in its position on complexation, which suggests that the C=O group does not participate in coordination [7,9,10]. The IR spectra of complexes also give the new bands at 407-497 and 312-328 cm −1 due to ν(M-N) and ν(M-S) stretching vibrations [7,11].…”