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Fe3+ and H+ co-doped PANI/GO (graphene oxide) composites with different iron dopant ratio depending on the starting FeCl3 (GOPNI-1, GOPNI-2, GOPNI-3 and GOPNI-4) are prepared. The formations of composite samples are investigated by some characterization techniques such as XRD, ATR-IR, UV–Vis spectrophotometer and thermal properties by TGA. While, the Nitrogen adsorption/desorption isotherm for (GOPNI-3) shows high specific surface area 48.7 m2 g−1 depending on Brunauer-Emmett-Teller (BET) method. Owing to the high surface area as well as the synergistic effect between polyaniline and graphene oxide the electrochemical performance of (GOPNI-3) shows high specific capacitance 1610.09 F g−1 at 1 A g−1 in 1 M H2SO4 acidic aqueous electrolyte. A symmetric supercapacitor device (SCs) with superbly electrochemical performance is fabricated using GOPNI-3 electrodes. The symmetric device exhibits high specific capacitance 810.88 F g−1 at 1 A g−1 in which the maximum energy density and power density of 18.02 Wh Kg−1 and 189.68 W kg−1, respectively. Moreover, the SCs device shows good cycling stability (67.1%) after 1000 cycles at a scan rate 200 mV s−1.

Hg(II), Cd(II) and binuclear Zn(II) complexes derived from the tetradentate N(1)-ethyl-N(2)-(pyridine-2-yl) hydrazine-1, 2-bis (carbothioamide) ligand (H2PET) have been prepared and characterized by conventional techniques. The isolated complexes acquired the formulas, [Hg(HPET)(H2O)2Cl]⋅H2O, [Cd(HPET)Cl] and [Zn2(HPET)(PET)(OAc)]⋅H2O, respectively. IR data revealed that the ligand behaves as monobasic tridentate through (CN)py, (C-S) and new (NC)azomethine(∗) groups in both Hg(II) and Cd(II) complexes. In the binuclear Zn(II) complex, the behavior of ligand contains two types, where H2PET acts as dibasic tetradentate via (CN)py, both deprotonated (C-SH) and the new (NC)azomethine(∗) towards two Zn atoms and also it acts as monobasic tridentate via (CS), deprotonated (C-SH) and (CN)py towards the same Zn atoms. An octahedral geometry for Hg(II) complex and tetrahedral geometry for both Cd(II) and Zn(II) complexes were proposed. The bond lengths, bond angles, HOMO, LUMO and dipole moment have been calculated by DFT using materials studio program to confirm the geometry of ligand and its metal complexes. The association constant of the ligand and the stability constants of its complexes as well as the thermodynamic parameters were calculated by pH metric measurements at 298, 308 and 318K in 50% dioxane-water mixture, respectively. Also, the kinetic and thermodynamic parameters for the different thermal degradation steps of the complexes were determined by Coats-Redfern and Horowitz-Metzger methods. Moreover, the anti-oxidant (using ABTS and DPPH methods), anti-hemolytic, and cytotoxic activities of the compounds have been tested.

Cr(III), Mn(II) and Fe(III) complexes derived from the quadruple potential dithione heterocyclic thiosemicarbazide ligand (H 2 PET) have been prepared and characterized by conventional techniques. The isolated complexes were assigned the formulae, [Cr(HPET)(H 2 O) 2 Cl 2 ]·3H 2 O, [Mn(HPET)(H 2 O)Cl] 2 and [Fe(HPET)(H 2 O) 2 Cl 2 ]·H 2 O, respectively. IR data revealed that the ligand behaves as monobasic bidentate through (C N) py and (C S) groups in both Cr(III) and Fe(III) complexes. In the binuclear Mn(II) complex, H 2 PET acts as NSNS monobasic tetradente via (C N) py , (C S), (C S) and the new azomethine, (N C) * groups. An octahedral geometry for all complexes was proposed. The bond lengths, bond angles, HOMO, LUMO and dipole moment have been calculated by DFT using materials studio program to confirm the geometry of H 2 PET and its metal complexes. The ligand association constant and the stability constants of its complexes in addition to the thermodynamic parameters were calculated from pH metrically at 298, 308 and 318°K in 50% dioxane–water mixture, respectively. Also, the kinetic and thermodynamic parameters for the different thermal degradation steps of the complexes were determined by Coats–Redfern and Horowitz–Metzger methods. Moreover, the anti-oxidant (using ABTS and DPPH methods), anti-hemolytic, and cytotoxic activities of the compounds have been tested.