TITLE:
Physicochemical and Analytical Studies of Some Monomer and Polymer Complexes Derived from Selected Aroyl Hydrazone
AUTHORS:
Aymen Hussien Ahmed, Mohsen Mahmoud Mostafa
KEYWORDS:
Aroyl Hydrazones Complexes, Polymer and Monomer Complexes, FTIR, Synthesis, Stoichiometry of Complexes
JOURNAL NAME:
Open Journal of Inorganic Chemistry,
Vol.12 No.1,
January
31,
2022
ABSTRACT: New solid complexes derived
from the reaction of aroyl hydrazones, 2-hydroxy-1-naphthaldehyde benzene sulphonyl hydrazone (HNB), and 2-hydroxy-1-naphthaldehyde p-toluene
sulphonyl hydrazone (HNT), with Co2+, Ni2+,
and Cu2+ salts have been isolated and characterized using elemental
analyses, spectral (UV-vis., IR), molar conductivity and magnetic
measurements. The modes of bonding as well as
the stereochemistry of the isolated solid complexes were discussed. The
results suggested that both HNB and HNT coordinated with the metal ions in a
bidentate manner forming a polymeric chain in the case of HNB while monocular
complexes were formed in the case of HNT. The amounts of solvent in the solid
complexes were determined by TGA measurements. Also, spectral studies of HNT
with Co2+ and Fe3+ ions in solution were carried and the
ratio of complexes was determined by continuous variation, molar ratio, and
slope ratio methods. Moreover, the results suggest the formation of 1:1 (M:L)
for Co2+ ions while three species with ratios of 1:1, 1:2, and 2:1
(M:L) have been observed in the case of Ni2+ and Cu2+. Finally, conductance titration of HNB and HNT with
Co2+ ion elucidates the formation of two species with ratios
1:1 and 1:2 (M:L) in the case of the Co2+-HNB while 1:1 (M:L)
belongs to the Co2+-HNT system.