Synthesis, spectroscopic investigation and antimicrobial activities of some transition metal complexes of a [(2-hydroxyacetophenone)-3-isatin]-bishydrazone

Decomposition of Bis(N-benzyl-salicydenaminato)zinc (II) Complex for the Synthesis of ZnO Nanoparticles to Fabricate ZnO-Chitosan Nanocomposite for the Removal of Iron (II) Ions from Wastewater

“…e stretching frequencies that confirm the coordination of nitrogen and oxygen atom into metal ion were also detected and allocated at 510 and 450 cm −1 which are attributed to the Zn-O and Zn-N bonds. ese outcomes were similar to the reported results [23]. e thermal decomposition profile of bis(N-benzylsalicydenaminato)zinc (II) complex was investigated using the thermogravimetric analysis linked with differential thermogravimetric analysis (TGA/DTA) ( Figure 2).…”

“…is weight loss of 63% in the single-stage decomposition is in the range of 241-407°C, which can be attributed to the loss of the ligand moiety with its oxidative degradation to metal oxide, beyond 407°C. is is due to high degree of electron delocalization through an intricate approach which advances to consistency in bond strength [23].…”

Synthesis, Spectroscopic Characterization, and Biological Evaluation Studies of 5-Bromo-3-(((hydroxy-2-methylquinolin-7-yl)methylene)hydrazono)indolin-2-one and Its Metal (II) Complexes

“…The broadening of this signal might be due to dipolar interactions, indicating lowered site symmetry suggesting that the unpaired electron resides mainly in the d x 2-d y 2 orbital [ 29 ]. The axial symmetry parameter “ G ” was determined as G = ( g || − 2.00277)/( g ⊥ − 2.00277) = 4.455, suggesting that there is no exchange interaction in the Cu(II) complex [ 30 ].…”

New Tridentate Hydrazone Metal Complexes Derived from 2-Hydroxy-4-Methoxyacetophenone and some Acid Hydrazides: Synthesis, Characterization and Antibacterial Activity Evaluation

“…Remarkable differences between the IR spectra of the ligands and those of the corresponding complexes were observed. The IR spectral bands observed at the ranges (3336-3198), (3145 -3076), (1695 -1663), (1625 -1610), (1263-1259) and (974 -951) cm -1 in the spectra of the free ligands are assigned to the phenolic ‫(ט‬O-H), ‫ט‬ (N-H), ‫ט‬ (C=O), ‫ט‬ (C=N), ‫ט‬ (C-O) and ‫ט‬ (N-N) respectively (Swathy et al, 2016 ;Ramesh et al, 2012). The disappearance of phenolic ‫ט‬ (OH) band in all the metal complexes indicates the deprotonation of the phenolic-OH group and coordination through a phenolate oxygen.…”

“…The disappearance of phenolic ‫ט‬ (OH) band in all the metal complexes indicates the deprotonation of the phenolic-OH group and coordination through a phenolate oxygen. The appearance of ‫ט‬ (C-O)bands in the spectra of the complexes in the range (1349-1311) cm -1 , suggests the bonding of ligand through a deprotonated (C-O)phenolate group to the metal (Singh et al, 2013 ;Swathy et al, 2016). The ‫ט‬ (C=O) band observed at (1664 and 1663) cm -1 in the spectra of the ligands AMBH and AAH, are shifted considerably to lower wave number by (54-8) cm -1 , in its metal complexes, suggesting coordination through carbonyl oxygen (Singh et al, 2013 ;Guo et al, 2011).…”