DFT study of new bipyrazole derivatives and their potential activity as corrosion inhibitors.
In the present work, a theoretical study of five bipyrazolic-type organic compounds, 4-{bis[(3,5-dimethyl-1H-pyrazolyl-1-yl)methyl]-amino}phenol (1), N1,N1-bis[(3,5-dimethyl-1H-pyrazol-1-yl)methyl}]-N4,N4-dimethyl-1,4-benzenediamine (2), N,N-bis[(3,5-dimethyl-1H-pyrazol-1-yl)methyl]aniline (3), 4-[bis(3,5-dimethyl pyrazol-1-yl-methyl)-amino]butan-1-ol (4) and ethyl4-[bis(3,5-dimethyl-1H-pyrazol-1-yl-methyl) aminobenzoate] (5), has been performed using density functional theory (DFT) at the B3LYP/6-31G(d) level in order to elucidate the different inhibition efficiencies and reactive sites of these compounds as corrosion inhibitors. The efficiencies of corrosion inhibitors and the global chemical reactivity relate to some parameters, such as EHOMO, ELUMO, gap energy (DeltaE) and other parameters, including electronegativity (chi), global hardness (eta) and the fraction of electrons transferred from the inhibitor molecule to the metallic atom (DeltaN). The calculated results are in agreement with the experimental data on the whole. In addition, the local reactivity has been analyzed through the Fukui function and condensed softness indices.
Wang
Hengliang
H
College of Chemistry, Xiangtan University, Xiangtan, 411105, People's Republic of China.
Wang
Xueye
X
Wang
Hanlu
H
Wang
Ling
L
Liu
Aihong
A
D001665:Binding Sites; D002626:Chemistry, Pharmaceutical; D003343:Corrosion; D015195:Drug Design; D004583:Electrons; D008958:Models, Molecular; D008962:Models, Theoretical; D008968:Molecular Conformation; D011487:Protein Conformation; D011720:Pyrazoles / Q000737:chemistry*; D013816:Thermodynamics
D011720:Pyrazoles