Spectroscopic, thermal and antibacterial studies on Mn(II) and Co(II) complexes derived from thiosemicarbazone

• Published in: Journal of the Serbian Chemical Society 2009-01, Vol.74 (8-9), p.907-915
• Main Authors: Chandra, Sulekh, Tyagi, Monika, Refat, Moamen
• Format: Article
• Language: English
• Subjects: antimicrobial activity; azo dye; azo-azomethine; spectroscopy; transition metals
• ISSN: 0352-5139; 1820-7421
• DOI: 10.2298/JSC0909907C

Mn(II) and Co(II) complexes having the general composition [M(L)2X2] (where L = 2-pyridinecarboxaldehyde thiosemicarbazone, M = Mn(II) and Co(II), X = Cl- and - NO3 ) were synthesized. All the metal complexes were characterized by elemental analysis, molar conductance, magnetic susceptibility measurements, mass, IR, EPR, electronic spectral studies and thermogravimetric analysis (TG). Based on the spectral studies, an octahedral geometry was assigned for all the complexes. Thermal studies of the compounds suggest that the complexes are more stable than the free ligand. This fact was supported by the kinetic parameters calculated using the Horowitz-Metzger (H-M) and Coats-Redfern (C-R) equations. The antibacterial properties of the ligand and its metal complexes were also examined and it was observed that the complexes are more potent bactericides than the free ligand. Sintetisani su kompleksi Mn(II) i Co(II) opsteg sastava [M(L)2X2] (gde je L = 2-piridinkarboksialdehid tiosemikarbazona, M = Mn(II) i Co(II), X = Cl- i NO3-). Svi metalni kompleksi su okarakterisani elementarnnom analizom, molarnom provodljivoscu, merenjem magnetne susceptibilnosti, masenim, IR, EPR, elektronskim spektralnim proucavanjima i termogravimetrijskom analizom (TG). Na osnovu spektralnih izucavanja predlozena je oktaedarska geometrija za sve komplekse. Termicka proucavanja jedinjenja sugerisu da su kompleksi stabilniji od slobodnog liganda. Ovo je podrzano proucavanjem kinetickih parametara primenom Horowitz-Metzger (H-M) i Coats-Redfern (C-R) jednacina. Antibakterijske osobine liganda i njegovih metalnih kompleksa su takodje izucavane i primeceno je da su kompleksi mocniji baktericidi nego slobodni ligand.