A Theoretical Survey of Tautomerism Stability of 4-hydroxyquinoline Considering Solvent Effect by PCM Model
Publish place: کنفرانس بین المللی مهندسی و علوم کاربردی
Publish Year: 1394
نوع سند: مقاله کنفرانسی
زبان: English
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ICEASCONF01_512
تاریخ نمایه سازی: 9 مرداد 1395
Abstract:
Computational calculations at B3LYP/6-311++G (d,p) level were employed in the study of the predominant tautomeric of 4-hydroxyquinoline derivatives (5-H, 5-NO2, 5-Cl, 5-OH, 5- CH3, 6-NO2, 6-Cl, 6-OH, 6-CH3, 7-NO2, 7-Cl, 7-OH, 7-CH3, 8-NO2, 8-Cl, 8-OH, 8-CH3, ) in the gas phase and selected solvents (benzene (non-polar solvent), tetrahydrofuran (THF) (polar aprotic solvent) and water (protic solvent)). The tautomers were also optimized in solvents according to the polarisable continuum method (PCM). For electron withdrawing and releasing derivatives the order of stability is X1 >X2 >X3, and X1 form is a more stable and dominant form. An exception in the gas phase is X2 isomer of (8-OH) which has two forms. In one, the hydrogen bond between hydroxyl substituted with nitrogen isn’t formed, but in another it is formed. If the hydrogen bond is formed, X2 isomer is more stable than X1. In addition variation of dipole moments and charges on atoms in the solvents are studied.
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Authors
Zabialah Heidarnezhad
Department of Chemistry, University of Zanjan, P.O. Box ۴۵۳۷۱-۳۸۷۹۱, Zanjan, Iran.
Maryam nayebzade
Department of Chemistry, University of Zanjan, P.O. Box ۴۵۳۷۱-۳۸۷۹۱, Zanjan, Iran.