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1.
Sci Rep ; 12(1): 12483, 2022 07 21.
Article in English | MEDLINE | ID: mdl-35864183

ABSTRACT

Incorporation of novel-prepared metal-organic complexes as crosslinking accelerators for multifunctional epoxy was on top of interest by coating formulators. The present work investigated the loading of mixed ligand metal complexes (Zr(IV) and Cu(II)) of metformin (MF) and 2.2'bipyridine (Bipy) against the free ligands as crosslinking modifiers via some epoxy coating formulations to assess their superb performances on the C-steel surface. Zr(IV) and Cu(II) demonstrated the minor energy gap (∆E) values at 0.190 au compared to free MF and Bipy according to the calculated energy values, and this behavior reflected their enhanced properties via epoxy coating applications. EIS measurements using high saline formation water as a corrosive medium were performed and offered that PA-DGEBA/MC-Cu coated film showed the superior resistance values (Rct = 940 and Rc = 930 kΩ cm2). The accelerated corrosion salt spray experiment clarified that PA-DGEBA/MC-Cu coating achieved the least corrosion rate at 0.00049 mm/y and exhibited the highest protection efficiency of 99.84%. SEM/EDX combination survey affirmed the protective performance of the checked coatings. AFM microanalysis confirmed that surface-treated Cu(II) coating displayed the smoothest film surface with complete curing. Mechanical durability properties were evaluated and the obtained results illustrated that pull-off adhesion for PA-DGEBA/MC-Cu coated film fulfilled the highest adhesion strength at 6.3 MPa, the best bend character at 77, and the maximum impact resistance at 59.7 J. UV immovability trial was performed at 10 irradiance and 80 h duration. PA-DGEBA/MC-Cu coated film displayed the highest resistance to UV irradiance with blistering (#8 size and few frequencies) in addition to offering a minor gloss variation and matt properties.


Subject(s)
Coordination Complexes , Steel , Corrosion , Dental Materials , Epoxy Resins , Surface Properties
2.
Spectrochim Acta A Mol Biomol Spectrosc ; 137: 535-46, 2015 Feb 25.
Article in English | MEDLINE | ID: mdl-25240146

ABSTRACT

2-Cyano-2-(p-tolyl-hydrazono)-thioacetamide (Cthta) reacted with V(IV), Zr(IV), Pd(II), Pt(IV), Ce(IV) and U(VI) in acetone as a solvent at room temperature to form a solid complexes with characteristic color for metal ion. The molar ratio for all synthesized complexes is M:Cthta=1:2 which was established from the results of chemical analysis. The isolated complexes have been characterized with their melting points, elemental analysis, magnetic properties, conductance measurements, mass, IR, UV-Vis. and (1)H NMR spectroscopic methods and thermal analyses. The results supported the formation of the complexes and indicated that the Cthta reacts as a bidentate ligand. The thermogravimetric and infrared spectroscopic data confirmed the presence of water in the composition of the complexes. The molar conductance values of all complexes in (DMSO) were found in the range 150.71-328.85S cm(2) mol(-1) at room temperature. The magnetic moments of the complexes were measured at room temperature. The kinetic parameters of thermogravimetric and its differential have been evaluated by using Coats Redfern (CR) and Horowitz-Metzeger (HM) methods. The ligand as well as their metal complexes were also evaluated for their antibacterial and antifungal activities.


Subject(s)
Anti-Infective Agents/chemistry , Anti-Infective Agents/pharmacology , Hydrazones/chemistry , Thioacetamide/chemistry , Anti-Infective Agents/chemical synthesis , Chemistry Techniques, Synthetic , Coordination Complexes/chemistry , Drug Evaluation, Preclinical/methods , Kinetics , Magnetic Resonance Spectroscopy , Microbial Sensitivity Tests , Molecular Structure , Spectrophotometry, Infrared , Spectrophotometry, Ultraviolet , Temperature , Thermogravimetry
3.
Spectrochim Acta A Mol Biomol Spectrosc ; 60(12): 2803-5, 2004 Oct.
Article in English | MEDLINE | ID: mdl-15350915

ABSTRACT

Cobalt(II) carbonate, CoCO3.4H2O and lead(II) carbonate, PbCO3.2H2O were synthesis by a new simple method during the reaction of aqueous solutions of CoX2 (X=Cl-, NO3- and CH3COO-) and PbX2 (X=NO3- or CH3COO-), respectively, with urea at approximately 85 degrees C for 2 h. The infrared spectra of the reaction products clearly indicates the absence of the bands due to coordinated urea, but show the characteristic bands of ionic carbonate. A general mechanisms describing the formation of cobalt and lead carbonates are suggested.


Subject(s)
Carbonates/isolation & purification , Cobalt/isolation & purification , Lead/isolation & purification , Carbonates/chemical synthesis , Spectrophotometry, Atomic , Spectroscopy, Fourier Transform Infrared , Urea
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