Synthesis and Spectral Characterization of Hydrazone Schiff Bases Derived from 2,4-Dinitrophenylhydrazine. Crystal Structure of Salicylaldehyde-2,4-Dinitrophenylhydrazone

Abstract

Reactions of 2,4-dinitrophenylhydrazine with salicylaldehyde, pyridine-2-carbaldehyde and 2-aminobenzophenone in methanol result in the hydrazone Schiff base ligands salicylaldehyde-, pyridine-2-carbaldehyde-, and 2-aminobenzophenone-2,4-dinitrophenylhydrazone, respectively. Crystals of salicylaldehyde-2,4-dinitrophenylhydrazone are monoclinic, space group P2 1 /c, a = 13.820(3), b = 4.3515(9), c = 25.159(7)Å, β = 123.01(2) • with Z = 4. The molecular packing is mostly a zigzag or herring-bone pattern.

Synthesis, Physico-chemical and Antimicrobial Studies on Metal (II) Complexes with Schiff Base Derived from Salicylaldehyde and 2,4-Dinitrophenylhydrazine

“…An equimolar mixture of salicylaldehyde (10 mmol) and 2,4-dinitrophenylhydrazine (10 mmol) in hot ethanol (30 ml) was refluxed with constant stirring for 3 hrs. The orange crystalline solid obtained was filtered, washed with ethanol and then recrystallized from methanol and dried in a desiccator over calcium chloride (CaCl 2 ) for three days [9,10].…”

<b>Synthesis, spectral characterizations and antimicrobial activity of some Schiff bases of 4-chloro-2-aminophenol</b>

“…Methoxy and CH=N groups stretching vibrations appear between 3000 and 2800 cm -1 . The strong or medium bands between 3428 and 3325 cm -1 at the Schiff bases that not including hydrogen bonding can be assigned to ν(OH) [52,[55][56][57][58].…”

Significant effect of surfactant micelles on pH dependent fluorescent off–on–off behavior of Salicylaldehyde-2,4-Dinitrophenylhydrazone

“…Salicylaldehyde-2,4-Dinitrophenylhydrazone (1) was synthesized as per reported procedure [22] by stirring 2,4-dinitrophenyl hydrazine with salicylaldehyde in 1:1 molar ratio in dry methanol for (1/2) h. The product was filtered and recrystallized from methanol. The characterization was done by recording ESI Mass and 1 H NMR (500 MHz) spectra.…”