Synthesis and Structural Studies of Chlorobenzoyl and Salicyloylhydrazone Complexes of Tridentate Hydrazones

Synthesis, Mesophase Behavior and Thermal Stability of Liquid Crystals Based on Different Central Linkages with Lateral Substitution and Terminal Heterocyclic Moieties

“…The hydrazone derivatives are used as fungicides and in the treatment of diseases such as tuberculosis, leprosy and mental disorders [30]. The remarkable biological activity of acid hydrazides, R-CO-NH-NH 2 , their corresponding hydrazones R-CO-NH-N¼CH-R 0 present in the living system have offered significant interest in recent years [12]. The remarkable biological activity of acid hydrazides R-CO-NH-NH 2 , a class of Schiff base, their corresponding aroylhydrazones R-CO-NH-N¼CH-R 0 and the dependence of their mode of chelation with transition metal ions present in the living system have been of significant interest in the past [31,32].…”

“…1,2,4-triazole and their derivatives constitute an important class of organic compounds with diverse agricultural, industrial and biological activities [8,9,10], including anti inflammatory [11]. Acid hydrazide and hydrazones are useful chelating agents and are of biological importance [12]. Isonicotinic acid hydrazide (inh) and its derivatives are antibacterial agents that have been used to treat tuberculosis, interacting with microbial cell walls [13,14].…”

Synthesis, Characterisation and Acetylcholinesterase Inhibition Activity of Nickel(II) and Copper(II) Complexes of <i>3</i>-Hydroxybenzaldehyde-<i>4</i>-nitrobenzoic Acid Hydrazone

“…These shifts are indicative of interaction between the ligands and the metal ions. The metal-oxygen and metal-nitrogen bonds [13,17,25] which hitherto were absent in the free ligand appeared in the nickel(II) complexes at: 692 cm -1 (M-O) and 559 cm -1 (M-N), and in copper(II) complex at 689 cm -1 (M-O) and 572 cm -1 (M-N). The ν(H-O) band appeared in the free ligand at 3472 cm -1 .…”

“…The ligand: 3-hydroxybenzaldehyde-4-nitrobenzoic acid hydrazone (L) was prepared in two steps, first was the synthesis of the precursor hydrazide and the second step yielded the hydrazone ligand [13,14]…”

Synthesis, characterization and antibacterial properties of some transition metal complexes of (1H-pyrrol-2-yl)-isonicotinoylhydrazone

“…This is presumably due to amide-imidol tautomerism (Scheme 2) and their subsequent coordination through the imidol oxygen [29]. Bands at 1600 cm -1 due to ν(C=N) of the ligand shifted to lower wave number in the complexes 1565-1575 cm -1 indicating the coordination of the azomethine nitrogen.…”