Studies on transition metal murexide complexes

Masoud, Mamdouh S.; Kassem, Taher S.; Shaker, Medhat A.; Ali, Alaa E.

doi:10.1007/s10973-005-9991-3

Cited by 32 publications

(11 citation statements)

References 34 publications

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“…Figure 2A shows a chemical structure of murexide used in this investigation as a capping and dispersing agent. Murexide exhibits chelating properties [41,42], which are related to its strong tridentate bonding to different metal atoms. Dissociated murexide acquires a negative charge in solutions (Figure 2).…”

Section: Characterization Techniquesmentioning

confidence: 99%

Facile Route for Fabrication of Ferrimagnetic Mn3O4 Spinel Material for Supercapacitors with Enhanced Capacitance

Nawwar

Zhitomirsky

2022

Energies

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The purpose of this investigation was the development of a new colloidal route for the fabrication of Mn3O4 electrodes for supercapacitors with enhanced charge storage performance. Mn3O4-carbon nanotube electrodes were fabricated with record-high capacitances of 6.67 F cm−2 obtained from cyclic voltammetry tests at a scan rate of 2 mV s−1 and 7.55 F cm−2 obtained from the galvanostatic charge–discharge tests at a current density of 3 mA cm−2 in 0.5 M Na2SO4 electrolyte in a potential window of 0.9 V. The approach involves the use of murexide as a capping agent for the synthesis of Mn3O4 and a co-dispersant for Mn3O4 and carbon nanotubes. Good electrochemical performance of the electrode material was achieved at a high active mass loading of 40 mg cm−2 and was linked to a reduced agglomeration of Mn3O4 nanoparticles and efficient co-dispersion of Mn3O4 with carbon nanotubes. The mechanisms of murexide adsorption on Mn3O4 and carbon nanotube are discussed. With the proposed method, the time-consuming electrode activation procedure for Mn3O4 electrodes can be avoided. The approach developed in this investigation paves the way for the fabrication of advanced cathodes for asymmetric supercapacitors and multifunctional devices, combining capacitive, magnetic, and other functional properties.

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Section: Characterization Techniquesmentioning

confidence: 99%

Facile Route for Fabrication of Ferrimagnetic Mn3O4 Spinel Material for Supercapacitors with Enhanced Capacitance

Nawwar

Zhitomirsky

2022

Energies

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“…The magnetic field was controlled with a (LMR Gauss meter). The g values were determined by comparison with 2,2-diphenyl pyridylhydrazone (DPPH) [25]. Molar magnetic susceptibilities, corrected for diamagnetism using Pascal's constants determined at room temperature (298˚K) applying Faraday's method.…”

Section: Measurementsmentioning

confidence: 99%

Synthesis, Molecular Spectroscopy, Computational, Thermal Analysis and Biological Activity of Some Orotic Acid Complexes

Masoud¹,

Ali²,

Elfatah³

et al. 2021

OJINM

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Binary orotic acid metal complexes of Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Hg(II), and two mixed metals complexes of (Co(II), Ni(II)) and (Ni(II), Cu(II)) were synthesized and characterized by elemental analysis, IR, electronic spectra, magnetic susceptibility, and ESR spectra. The Analysis proved that the ligand has different coordination modes and the complexes were of octahedral, tetrahedral, and trigonal bipyramidal geometries. Molecular modeling techniques and quantum chemical methods have been performed for orotic acid to calculate charges, bond lengths, bond angles, dihedral angles, electronegativity (χ), chemical potential (µ), global hardness (η), softness (σ) and the electrophilicity index (ω). The thermal decomposition of the complexes was monitored by TGA, DTA, and DSC techniques under the N 2 atmosphere. The thermal decomposition mechanisms of the complexes were suggested. The biological activity of orotic acid and some of the complexes are tested against antibacterial and antifungal organisms.

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“…All the change of entropy values, ΔS have -ve signs which indicate that the activated transition states are more ordered, i.e. in a less random molecular configuration than the reacting complexes [25][26][27][28][29][30].…”

Section: 𝑪𝒑mentioning

confidence: 99%

“…From TGA, Figures (21)(22)(23)(24)(25)(26)(27) Table (3) the mechanism of decomposition can be given.…”

Section: 𝑪𝒑mentioning

confidence: 99%

Thermal behavior and thermodynamic parameters of some complexes of biologically active nucleic acid constituents

Masoud¹,

Ramadan²,

Sweyllam³

et al. 2021

World J. Adv. Res. Rev.

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The thermal behavior of some complexes derived from biologically nucleic acid constituents has been studied applying differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) techniques. Thermodynamic parameters, decompositions and thermal stabilities are calculated and explained. All the complexes gave exothermic peaks with -ve signs for change of entropy values, ΔS which indicate that the activated transition states are more ordered, i.e. in a less random molecular configuration than the reacting complexes. TGA gives the mechanism of decomposition.

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Studies on transition metal murexide complexes

Cited by 32 publications

References 34 publications

Facile Route for Fabrication of Ferrimagnetic Mn3O4 Spinel Material for Supercapacitors with Enhanced Capacitance

Facile Route for Fabrication of Ferrimagnetic Mn3O4 Spinel Material for Supercapacitors with Enhanced Capacitance

Synthesis, Molecular Spectroscopy, Computational, Thermal Analysis and Biological Activity of Some Orotic Acid Complexes

Thermal behavior and thermodynamic parameters of some complexes of biologically active nucleic acid constituents

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