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Acta Physico-Chimica Sinica  2009, Vol. 25 Issue (12): 2524-2530    DOI: 10.3866/PKU.WHXB20091126
QSAR and Molecular Design of Imidazoline Derivatives as Corrosion Inhibitors
HU Song-Qing, HU Jian-Chun, SHI Xin, ZHANG Jun, GUO Wen-Yue
College of Physis Science and Technology, China University of Petroleum, Dongying 257061, Shandong Province, P. R. China
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The quantitative structure-activity relationship (QSAR) of undecyl imidazoline corrosion inhibitors for anti-corrosion behavior towards hydrogen sulfide and carbon dioxide was studied using density functional theory (DFT) and regression analysis methods. A stepwise regression analysis was used to determine the main independent factors that affected the activity of the compounds and a QSAR model was established. The stability and predictive ability of the model were examined by“leave-one-out”(LOO) cross-validation method. We found that the electron transfer parameter (△N), the electrostatic charge of non-hydrogen atoms in the imidazole ring (∑Qring) and the mean molecular polarizability (α) were the main independent factors that contributed to corrosion inhibition. The fitting correlation coefficient (R2) and the cross-validation coefficient (q2) values were 0.924 and 0.917, respectively. These values indicate that the model is of significant statistical quality and has an excellent predictive ability for corrosion inhibitors. Based on this established model, new molecules with high anti-corrosion properties for hydrogen sulfide and carbon dioxide were theoretically designed. This model may be used as a theoretical reference for the design of new corrosion inhibitors.

Key wordsCorrosion inhibition performance      Imidazoline derivative      Quantumchemistry parameter      Quantitative structure-vity relationship      Molecular design     
Received: 16 June 2009      Published: 29 September 2009
MSC2000:  O641  
Corresponding Authors: GUO Wen-Yue     E-mail:
Cite this article:

HU Song-Qing, HU Jian-Chun, SHI Xin, ZHANG Jun, GUO Wen-Yue. QSAR and Molecular Design of Imidazoline Derivatives as Corrosion Inhibitors. Acta Physico-Chimica Sinica, 2009, 25(12): 2524-2530.

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