Preparation and Characterization of New (Halogenated Azo-Schiff) Ligands with Some of their Transition Metal Ions Complexes

Abstract

Two new halogenated azo-Schiff ligands were prepared in two steps. The first step included a condensation between 4-amino acetophenone and 2-fluoro-4-bromo aniline to give the corresponding Schiff base. In the second step, the diazonium salt of this Schiff base reacted with 2-naphthol and 4,5-diphenylimidazole to form two new azo-Schiff base derivatives as ligands; (3-((E)-(4-((E)-1-((4-bromo-2-fluorophenyl) imino)ethyl) phenyl) diazenyl) naphthalen-2-ol (HSBAN) (L1) and ((E)-N-(4-bromo-2-fluorophenyl)-1-(4-((E)-(4,5-diphenyl-1H-imidazol-2-yl)diazenyl) phenyl) ethan-1-imine) (HSBAI) (L2), respectively. These new ligands were characterized by mass spectrometry, FT-IR, 1H NMR, UV-Visible spectroscopy and elemental microanalysis (CHN). Five divalent transition metal ion complexes (Co, Ni, Cu, Cd, and Hg) were prepared and characterized, beyond the determination of the optimal condition (concentration, pH value, and the mole ratio M:L) using UV-visible studies. Additionally, complementary techniques, such as atomic absorption, electrical conductivity and magnetic susceptibility, were performed to deduce their geometries. The comprehensive study suggested an octahedral geometry for all complexes except Cd and Hg complexes of the first ligand.

Ni2+, Pt4+, Pd2+, and Mn2+ Metal ions Complexes with Azo Derived from Quinolin-2-ol and 3-amino-N-(5-methylisoxazol-3-yl) Benzenesulfonamide: Synthesis, Characterization, Thermal Study ,and Antioxidant Activity

“…3, the occurrence of coordination in [Mn(L)Cl(H2O)2], is because of the observed shifting in absorption range of detected transitions at ultra violet region compared to the range of the same transitions in free (HL) to appear at 296 nm, 33783 cm -1 and 322 nm , 31055 cm -1 . Other indication supports the coordination is clear of the d-d transitions in the metal itself, those transitions denoted as 6 A1→ 4 T1(G) at (493 nm, 20283 cm -1 ) and 6 A1→ 4 T2(G) at (703 nm, 14224 cm -1 ) and the magnetic moment (3.71 B.M) can definitely support tetrahedral geometry 21,22 . Figure 4 of [Pd(L)(H2O)Cl] complex shows electronic transitions in ultra violet region resemble those in ligand in its free form with some modifications including shifting and intensity changes because of the coordination with metal ion, those are (π→ π*) and (n→ π*)+(C.T) at 298 nm, 33557 cm -1 and 339 nm, 29498 cm -1 respectively.…”

Synthesis, Biological and Medicinal Evaluation of New Boric Acid Ester Derived From Antibiotic Drug with Some of Its Metal Complexes

“…Two absorption bands were observed in the spectrum of copper complex (C2) Figure 11 at [960 nm (10416 cm -1 ) and 739 nm (13531 cm -1 )] which were attributed to[ 2 B1g→ 2 A1g and 2 B1g → 2 B2g] transitions, respectively [20]. The magnetic moment of the copper complex was 2.23 B.M, and these values of Meff agree with Octahedral geometry [22][23][24]. In distilled water, the molar conductance for each synthesized complex was measured using (10 -3 M).…”

Designation of Nano-Analytical Reagents and Evaluation of Nano-Applications

“…Based on the foregoing: Those in charge of building and designing library buildings can benefit from the developments introduced by nanotechnology in the field of construction and building, in order to achieve many benefits that help protect the paper collections of libraries and make them settle in an appropriate environment free from causes of damage and deterioration (by These developments make the library buildings resistant to heat, ultraviolet radiation, humidity, dust and dirt, and direct sunlight, by using glass panels made of nano-materials for the windows of library buildings, which have a great ability to emit light inside the building in a form that is characterized by purity while achieving complete isolation [36][37][38][39][40][41][42][43][44]. Therefore, the paper collections stored in the buildings of these libraries enjoy a good environment with standards and specifications that are able to protect them and keep them for long periods of time used by the beneficiaries [45][46][47][48].…”