The Experts below are selected from a list of 1533 Experts worldwide ranked by ideXlab platform

Kožuh Zala - One of the best experts on this subject based on the ideXlab platform.

  • Compounds of 2-aminopyridin-3-ol and transition metals
    2021
    Co-Authors: Kožuh Zala
    Abstract:

    2-aminopiridin-3-ol je organska heterociklična molekula z molekulsko formulo C5H6N2O. V molekuli sta dva dušikova in en kisikov atom, zato se molekula, njen anion ali kation, lahko koordinirajo na centralni atom ali ion v kompleksnih spojinah. Pregledali smo strukture v bazi podatkov CSD in ugotovili, da ni podatkov za komplekse prehodnih kovin z 2-aminopiridin-3-olom. Našli smo le strukturo renijevega kompleksa z deprotonirano obliko 2-aminopiridin-3-ola, 2-amino-3-oksipiridinom. V ostalih spojinah je 2-aminopiridin-3-ol protoniran in 2-amino-3-hidroksipiridinijev ion tvori soli s kompleksnimi anioni prehodnih kovin. Za primerjavo so prikazane še strukture kompleksov kobaltovega klorida s hidroksipiridini: 3-hidroksipiridin-2-onom, 3-hidroksipiridinom in 2-hidroksipiridinom. Našteti hidroksipiridini se lahko vežejo na centralni ion v kompleksih na podoben način kot pričakujemo za 2-aminopiridin-3-ol. Podobno kot 2-aminopiridin-3-ol tudi ti ligandi tvorijo vodikove vezi, ki stabilizirajo strukture spojin.2-aminopyridin-3-ol is an Organic Heterocyclic Compound with molecular formula C5H6N2O. In molecule there are two N- and one O-donor atoms, therefore molecule, its anion or cation could coordinate to a central atom or ion in complexes. We examined the structures in the CSD database and found that there are no data of transition metal complexes with 2-aminopyridin3-ol. We found only the structure of a rhenium complex with the deprotonated form of 2-aminopyridin-3-ol, 2-amino-3-oxypyridine. In other Compounds 2-aminopyridin-3-ol is protonated and 2-amino-3-hydroxypyridinium ion forms salts with complex anions of transition metals. For comparison, other structures of cobalt chloride with hydroxypyridines: 3-hydroxypyridine, 3-hxydroxypyridin-2-one and 2-hydroxypyridine are shown. The listed hydroxypyridines can bind to a central atom or ion in the complexes in a similar way as expected for 2-aminopyridin-3-ol. Similar to 2-aminopyridin-3-ol, these ligands form hydrogen bonds, which stabilise the structures of the Compounds

H Herrera-hernández - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical Impedance Spectroscopy Analysis of 2-Mercaptobenzimidazole (2MBI) as Corrosion Inhibitor in HCl 1M
    2020
    Co-Authors: A Espinoza, G Negrón, M E Palomar-pardavé, M A Romero-romo, I Rodríguez, H Herrera-hernández
    Abstract:

    This work presents the results concerning the effect of different concentrations of an Organic Heterocyclic Compound that displays corrosion inhibiting properties, known as 2-mercaptobenzimidazole, 2MBI, in a system comprising samples of the steel type API 5L X52 exposed to HCl 1M. The impedance spectra revealed that there was a continuous increase of |Z| as a function of increasing inhibitor concentrations in the electrolyte. A 200 ppm 2MBI was tested also, however, the greatest corrosion inhibiting efficiency was attained 99%, IE, with much smaller concentrations of the Compound. This is sufficient reason to consider it a good corrosion inhibitor in HCl, just as it was effective for H 2 SO 4 . Furthermore, the inhibition kinetics study undertaken indicated that the 2MBI added in a fairly large concentration of 200 ppm in 1M HCl maintains its effectivity up to 32 immersion days. Also, it was observed that the corrosion potential, E corr , became more negative as the 2MBI Organic molecules concentration increased in the system, which suggests that this inhibitor may be acting on the cathodic and anodic sites, thus being considered a mixed type inhibitor, in agreement with the corrosion mixed potential theory

A Espinoza - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical Impedance Spectroscopy Analysis of 2-Mercaptobenzimidazole (2MBI) as Corrosion Inhibitor in HCl 1M
    2020
    Co-Authors: A Espinoza, G Negrón, M E Palomar-pardavé, M A Romero-romo, I Rodríguez, H Herrera-hernández
    Abstract:

    This work presents the results concerning the effect of different concentrations of an Organic Heterocyclic Compound that displays corrosion inhibiting properties, known as 2-mercaptobenzimidazole, 2MBI, in a system comprising samples of the steel type API 5L X52 exposed to HCl 1M. The impedance spectra revealed that there was a continuous increase of |Z| as a function of increasing inhibitor concentrations in the electrolyte. A 200 ppm 2MBI was tested also, however, the greatest corrosion inhibiting efficiency was attained 99%, IE, with much smaller concentrations of the Compound. This is sufficient reason to consider it a good corrosion inhibitor in HCl, just as it was effective for H 2 SO 4 . Furthermore, the inhibition kinetics study undertaken indicated that the 2MBI added in a fairly large concentration of 200 ppm in 1M HCl maintains its effectivity up to 32 immersion days. Also, it was observed that the corrosion potential, E corr , became more negative as the 2MBI Organic molecules concentration increased in the system, which suggests that this inhibitor may be acting on the cathodic and anodic sites, thus being considered a mixed type inhibitor, in agreement with the corrosion mixed potential theory

G Negrón - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical Impedance Spectroscopy Analysis of 2-Mercaptobenzimidazole (2MBI) as Corrosion Inhibitor in HCl 1M
    2020
    Co-Authors: A Espinoza, G Negrón, M E Palomar-pardavé, M A Romero-romo, I Rodríguez, H Herrera-hernández
    Abstract:

    This work presents the results concerning the effect of different concentrations of an Organic Heterocyclic Compound that displays corrosion inhibiting properties, known as 2-mercaptobenzimidazole, 2MBI, in a system comprising samples of the steel type API 5L X52 exposed to HCl 1M. The impedance spectra revealed that there was a continuous increase of |Z| as a function of increasing inhibitor concentrations in the electrolyte. A 200 ppm 2MBI was tested also, however, the greatest corrosion inhibiting efficiency was attained 99%, IE, with much smaller concentrations of the Compound. This is sufficient reason to consider it a good corrosion inhibitor in HCl, just as it was effective for H 2 SO 4 . Furthermore, the inhibition kinetics study undertaken indicated that the 2MBI added in a fairly large concentration of 200 ppm in 1M HCl maintains its effectivity up to 32 immersion days. Also, it was observed that the corrosion potential, E corr , became more negative as the 2MBI Organic molecules concentration increased in the system, which suggests that this inhibitor may be acting on the cathodic and anodic sites, thus being considered a mixed type inhibitor, in agreement with the corrosion mixed potential theory

M E Palomar-pardavé - One of the best experts on this subject based on the ideXlab platform.

  • Electrochemical Impedance Spectroscopy Analysis of 2-Mercaptobenzimidazole (2MBI) as Corrosion Inhibitor in HCl 1M
    2020
    Co-Authors: A Espinoza, G Negrón, M E Palomar-pardavé, M A Romero-romo, I Rodríguez, H Herrera-hernández
    Abstract:

    This work presents the results concerning the effect of different concentrations of an Organic Heterocyclic Compound that displays corrosion inhibiting properties, known as 2-mercaptobenzimidazole, 2MBI, in a system comprising samples of the steel type API 5L X52 exposed to HCl 1M. The impedance spectra revealed that there was a continuous increase of |Z| as a function of increasing inhibitor concentrations in the electrolyte. A 200 ppm 2MBI was tested also, however, the greatest corrosion inhibiting efficiency was attained 99%, IE, with much smaller concentrations of the Compound. This is sufficient reason to consider it a good corrosion inhibitor in HCl, just as it was effective for H 2 SO 4 . Furthermore, the inhibition kinetics study undertaken indicated that the 2MBI added in a fairly large concentration of 200 ppm in 1M HCl maintains its effectivity up to 32 immersion days. Also, it was observed that the corrosion potential, E corr , became more negative as the 2MBI Organic molecules concentration increased in the system, which suggests that this inhibitor may be acting on the cathodic and anodic sites, thus being considered a mixed type inhibitor, in agreement with the corrosion mixed potential theory