Synthesis and Spectral Characterization of Schiff Base Cr(III), Mn(III), and Fe(III) Novel Macrocyclic Complexes Derived from Thiocarbohydrazide and Dicarbonyl Compound

Abstract

M(III) Schiff base macrocyclic complexes of the type [HLMX 2 ] where M = Cr(III), Mn(III), Fe(III) and X = Cl, OAc have been synthesized by condensation of acetylacetone and Thio-carbohydrazide (2:2) in the presence of divalent metal salt in methanolic medium. The complexes have been characterized with the help of elemental analysis, conductance measurements, magnetic measurements and their structural configuration have been determined by various spectroscopic (electronic, IR, 1 H NMR, 13 C NMR, GCMS) techniques. Electronic and magnetic moments of the complexes indicate that the geometries of the metal centers are octahedral.

Synthesis of Co(II) and Cr(III) salicylidenic Schiff base complexes derived from thiourea as precursors for nano-sized Co3O4 and Cr2O3 and their catalytic, antibacterial properties

“…This value is attributed to threefold orbital degeneracy 4 T 1g ground state [17]. Magnetic moment of the Cr(III) complex was 4.09 BM at room temperature, which is close to the predicted value for three unpaired electrons in the metal ion [18,19].…”

Macrocyclic Cr3+, Mn2+ and Fe3+ complexes of a mimic SOD moiety: Design, structural aspects, DFT, XRD, optical properties and biological activity

“…The complexes are found to be stable and soluble partly in solvents such as DMF and DMSO. Molar conductance measurement revealed the nonelectrolytic nature of Fe 3+ and Mn 2+ complexes whereas Cr 3+ complex was found to be 1:1 electrolyte as measured by the sandwich method using Keithley electrode . Many attempts were carried out to isolate a single crystal but it failed.…”

Some Novel Schiff Bases from Pyruvic Acid with Amines Containing N & S Donor Atoms: Synthesis, Spectral Studies and X-Ray Crystal Structures

“…In recent decades, much attention has been focused on Schiff bases derived from thyldithiocarbazate and S-n-octyldithiocarbazate [1] [2] [3] [4] as well as thiocarbohydrazide [5] [6] [7] and substituted thiosemicarbazide [8]. These dithiocarbazates were condensed with carbonyl compounds such as pyruvic acid to synthesize several novel Schiff bases which could lead to many potential applications.…”

“…This is because they contain mixed hard and soft donor atoms nitrogen, oxygen and sulfur which are ideal as chelating agents for metal ions. Most of the organic chelators are capable of exhibiting a wide range of biological potentials such as anticancer [1] [7] [8] [9] [10], antibacterial [5] [7] [11] [12], antifungal [5] [13]. They also have other applications as catalysts in reactions or as photoactive materials [14].…”