Preparation of Zinc (II) and Cadmium (II) Complexes of the Tetradentate Schiff Base Ligand 2-((E)-(2-(2-(pyridine-2-yl)- ethylthio)ethylimino)methyl)-4-bromophenol (PytBrsalH)

Abstract

We describe the synthesis and characterization of two new zinc (II) and cadmium (II) complexes of the tetradentate dissymmetric Schiff base ligand 2-((E)-(2-(2-(pyridine-2-yl)ethylthio)ethylimino)methyl)-4-bromophenol (PytBrsalH), prepared from 1-(2-pyridyl)-3-thia-5-aminopentane (pyta) and 5-bromosalicylaldehyde. The complexes were synthesized by treating an ethanolic solution of the ligand with equimolar amounts of appropriate metal salts in 1 M methanolic solution of NaOH or alternatively, by a more direct route in which the two reactants are added to a solution of the ligand immediately after formation of the latter and prior to any isolation. The complexes were characterized by elemental analysis, FTIR, 1H-NMR, electronic spectra and molar conductivity. According to obtained data, the probable coordination geometries of zinc and cadmium in these complexes with mixed N, S and O donor atoms are tetrahedral- and octahedral-like, respectively. Both complexes were found to be 1:1 electrolyte systems in acetonitrile.

Protection of mild steel corrosion with new thia-derivative Salens in 0.5 M H2SO4 solution

“…Schiff bases with structures shown in Fig. 1 were synthesized according to the literature [17]. Briefly, a solution of 1 mmol of 2-pyridin-2-yl-ethylsulfanyl in 5 mL absolute ethanol was added to a solution of 1 mmol of salicylaldehyde in 5 mL absolute ethanol to give clear yellow or orange solutions, which were gently refluxed for about 60 min.…”

“…The previous considerations led us to synthesize the Schiff base molecules with structures depicted in Fig. 1, namely, (S 1 ) and (S 2 ), [17]. The introduction of a sulfur atom in heterocyclic compounds containing nitrogen has been proved very good for inhibition of metal corrosion in acidic solutions [2,4,[18][19][20][21].…”

Synthesis and Properties of Dinuclear Imine Complexes of Zn(II) and Cd(II) by Novel Route

“…Thus, these complexes have carved a niche in studying the structural aspects of coordination chemistry. Also, owing to the completely filled configuration of d-orbitals, these complexes exhibit distinguished coordinative properties 1 . Numerous mononuclear metal complexes obtained using Schiff bases and other polydentate ligands have been well documented 2 .…”

Synthesis, Characterization and Reaction of New Ruthenium Aromatic Thioamide Nitrosyls with some Nitrogen Donor Ligands

“…It is highly unlikely for the oxygen atom of -OEt group to participate in the complex formation Two bands around (685-695 cm -1 and (630-660 cm -1 assigned to t(NH) of the ligand disappear in the spectra of complexes, further supports the deprotonation of NH group of the ligand. [19][20][21][22][23][24][25][26][27][28] The appearance of new medium intensity bands in the region 300-450 cm -1 is strong evidence of coordination by N, S and Cl. These bands have been assigned to coupled vibrations of u(Ru-N), u(Ru-Cl) and u(Ru-S).…”

“…[17][18][19] The impetus for this and similar work arises from the wide ranging applications of sulphur and nitrogen containing ligands in medicine. [20][21][22] The title ligand (LH) is capable of possessing diverse coordinating ability on changing R, R = 4-tolyl, N-carboethoxy-4-toluenethioamide (Hctt) R= 1-pyrrolyl, N-carboethoxy-1-pyrrolethioamide (Hcpt) R = 2 -t h i o p h e n y l , N -c a r b o e t h o x y -2 -thiophenethioamide ( Hcett) As a part of our continuing investigations on the transition metal complexes of aromatic thioamides, herein we report the synthesis, characterization and possible structures of ruthenium nitrosyls of the title ligand.…”