Experimental, quantum chemical calculations, and molecular dynamic simulations insight into the corrosion inhibition properties of 2-(6-methylpyridin-2-yl)oxazolo[5,4-f][1,10]phenanthroline on mild steel
Hemilability of 2-(1H-imidazol-2-yl)pyridine and 2-(oxazol-2-yl)pyridine ligands: Imidazole and oxazole ring Lewis basicity, Ni(II)/Pd(II) complex structures and spectra
作者:Abiodun O. Eseola、Wen Li、Olalere G. Adeyemi、Nelson O. Obi-Egbedi、Joseph A.O. Woods
DOI:10.1016/j.poly.2010.02.039
日期:2010.5
They were also used to study the substituent effects on the donor strengths as well as the coordination chemistries of the imidazole/oxazole fragments of the hemilabile ligands. All the observed protonation–deprotonation processes found within pH 1–14 media pertain to the imidazole or oxazole rings rather than the pyridyl Lewis bases. The donor characteristics of the imidazole/oxazole ring can be estimated
Luminescent properties of some imidazole and oxazole based heterocycles: Synthesis, structure and substituent effects
作者:Abiodun O. Eseola、Wen Li、Wen-Hua Sun、Min Zhang、Liwei Xiao、Joseph A.O. Woods
DOI:10.1016/j.dyepig.2010.07.005
日期:2011.3
ridine and 2,4-di-tert-butyl-6-(1H-phenanthro[9,10-d]imidazol-/oxazol-2-yl)phenol derivatives were synthesized and characterized using elemental and spectroscopic analyses as well as single-crystal X-ray diffraction analysis. The oxazole derivatives displayed higher photoluminescence efficiencies than their imidazole analogues. The 2-(phenanthro[9,10-d]oxazole/imidazol-2-yl)pyridine derivatives displayed
一系列的2-R-6-(芳基恶唑-/咪唑-2-基)吡啶和2,4-二叔丁基-6-(1H-菲并[9,10-d]咪唑-/恶唑-2合成并使用元素分析和光谱分析以及单晶X射线衍射分析对(yl)苯酚衍生物进行了表征。恶唑衍生物显示出比其咪唑类似物更高的光致发光效率。2-(菲[9,10-d]恶唑/咪唑-2-基)吡啶衍生物在非极性溶剂中的量子产率接近于1,但在极性溶剂中被淬灭。恶唑类似物在400nm和550nm区域之间产生可逆的荧光光开关,而咪唑类似物在极性溶剂中经历不可逆的光诱导的准分子形成。1个1 H NMR被用来合理化2-(菲并[9,10-d]咪唑-2-基)吡啶衍生物的准分子之间的分子间相互作用的建议模式。
Experimental, quantum chemical calculations, and molecular dynamic simulations insight into the corrosion inhibition properties of 2-(6-methylpyridin-2-yl)oxazolo[5,4-f][1,10]phenanthroline on mild steel
作者:I. B. Obot、N. O. Obi-Egbedi、E. E. Ebenso、A. S. Afolabi、E. E Oguzie
DOI:10.1007/s11164-012-0726-3
日期:2013.5
2-(6-Methylpyridin-2-yl)oxazolo[5,4-f][1,10]phenanthroline (MOP) was synthesized and characterized by elemental analysis and Fourier-transform infrared (FT-IR), 1H nuclear magnetic resonance (NMR), and 13C NMR spectra. MOP was evaluated as a corrosion inhibitor for carbon steel in 0.5 M H2SO4 solution using the standard gravimetric technique at 303–333 K. Quantum chemical calculations and molecular dynamic (MD) simulations were applied to analyze the experimental data and elucidate the adsorption behavior and inhibition mechanism of MOP. Results obtained show that MOP is an efficient inhibitor for mild steel in H2SO4 solution. The inhibition efficiency was found to increase with increase in MOP concentration but decreased with temperature. Activation parameters and Gibbs free energy for the adsorption process using statistical physics were calculated and discussed. The adsorption of MOP was found to involve both physical and chemical adsorption mechanisms. Density functional theory (DFT) calculations suggest that nitrogen and oxygen atoms present in the MOP structure were the active reaction sites for the inhibitor adsorption on mild steel surface via donor–acceptor interactions between the lone pairs on nitrogen and oxygen atoms together with the π-electrons of the heterocyclic and the vacant d-orbital of iron atoms. The adsorption of MOP on Fe (1 1 0) surface was parallel to the surface so as to maximize contact, as shown in the MD simulations. The experiments together with DFT and MD simulations provide further insight into the mechanism of interaction between MOP and mild steel.