Synthesis and properties of iron(II) and iron(III) complexes with 3-(?,?-dicarboxy-n-propylidene-hydrazino)-5,6-diphenyl-1,2,4-triazine (DCPT)

Investigation of the Molecular Surface Coating on the Stability of Insulating Magnetic Oils

“…The P sample (magnetite) presents both Fe 3+ and Fe 2+ at surface sites, whereas the oxidized samples present mostly Fe 3+ . Carboxylate complexation of Fe 3+ leads to more stable complexes than carboxylate complexation of Fe 2+ , and this fact is likely to be related to our findings. , The stronger the surface iron sites complexation with carboxylate moieties the thinner one should expect the surface magnetic dead layer, resulting in the enhancement of the saturation magnetization. For uncoated as well as for OA-coated samples, the M S values within the POX series increase as the Fe 3+ /Fe 2+ ratio increases (see data in Tables and ).…”

Spectro-Potentiality and Thermodynamic Studies on Schiff Base Hydrazone Derivatives Complexes with Some Transition Elements

“…The temperature was maintained constant by use of double-jacket cells with water circulated from a constant-temperature bath. Purified nitrogen gas was bubbled through the solution before and during the titrations multiple titrations were carried out for each system and the pH meter readings were recorded [6][7][8][9]. Electronic absorption spectra of the free ligand and its complexes in 75% (v/v) ethanol-water were recorded using a Shimadzu model UV-probe spectrophotometer.…”

“…The pH metric titrations in 75% (v/v) ethanol-water of the free ligand and its mixtures with the metal ions were carried out as described previously [6][7][8][9]. Using the equations of Irving and Rossoti [20] the caves were used to calculate the formation constants of the following equilibria:…”

“…Hydration Schiff base compounds containing quinoline moiety are well known in natural materials, and show interesting biological and antiviral activities [1][2][3]. Many derivatives of hydration compounds form colored complexes with different metal ions and can be used as analytical reagents for their determinations [4][5][6][7][8][9]. The coordination compounds of aroylhydrazones have been reported to act as enzyme inhibitors [10] and are useful due to their pharmacological applications [11][12][13].…”

“…The coordination compounds of aroylhydrazones have been reported to act as enzyme inhibitors [10] and are useful due to their pharmacological applications [11][12][13]. The study of Schiff base hydrazones has been growing interest because of their antimicrobial, anti-tuberculosis, and anti-tumor activity [1][2][3][4][5][6][7][8][9][10][11][12]. The azomethine (C=N) linkage in Schiff bases imports in elucidating the mechanism of transmission and reexamination reactions in biological system [14].…”