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Structures and vibrational frequencies of imidazole, benzimidazole and its 2-alkyl derivatives determined by DFT calculations
Other Title(s)
التركيب و الترددات التذبذبية لآيميدازول و بنزايميدازول و مشتقة 2-الكيل محسوبة بطريقة نظرية دالة الكثافة (DFT)
Joint Authors
Said, Bahjat Ali
Abbud, Naji Ali
al-Askari, Manal Murad Karim
Source
Issue
Vol. 30, Issue 1C (30 Jun. 2010), pp.119-131, 13 p.
Publisher
University of Basrah College of Science
Publication Date
2010-06-30
Country of Publication
Iraq
No. of Pages
13
Main Subjects
Abstract AR
التراكیب الجزیئیة للامیدازول و بنزایمیدازول و مشتقاته الإلكيلية بالموقع 2- و كذلك تردداتھا التذبذبیة عینت بطریقة نظریة دالة الكثافة و باستخدام المستوى النظري B3LYP عند مجموعة دالة 6-31G(d,p).
بعض الخواص الفیزیائیة مثل الطاقة الكلیة و طاقة أعلى مستوى مشغول و اوطأ مستوى فارغ كذلك عینت.
مشتقة -2 الكیل تمتلك اوطأ طاقة 458- ھارتري بالمقارنة مع بنزایمیدازول 226.27 ھارتري بینما أقل فرق طاقة بین HOMO و LUMO یكون في مشتقة -2 مثیل و كذلك ھي أكثر فعالیة كیمیائیة.
ایمیدازول و بنزایمیدازول جزیئات مستویة و لھا عزم ثنائي قطب 3.7285 و 3.5528 دیباي على التوالي.
C4 تحمل اكبر شحنة سالبة بالمقارنة مع C2 و C4 في الایمیدازول.
في جمیع الجزیئات المدروسة N1 تحمل اكبر شحنة سالبة من N3 و لكن ذرتي النتروجین N1 و N3 تظھران اكبر شحنة سالبة في مشتقة -2 أثيل.
ذرة الھیدروجین لمجموعة N-H مستویة في جمیع الجزیئات.
الترددات التذبذبیة المحسوبة نوقشت و قورنت مع الاطیاف المقاسة و المستحصلة نظریاً.
Abstract EN
The molecular structures of imidazole, benzimidazole and its 2-alkylderivatives as well as their vibrational frequencies have been determined by DFT method using B3LYP theory level at 6-311G (d, p) basis set.
Some physical properties such as total energy, HOMO, LUMO energies and dipole moments of studied molecules were calculated also determined.
2-ethyl derivative posses the lowest energy -458 hartree compare with imidazole -226.27 hartree whereas the smallest energy gap between HOMO and LUMO is in 2-methyl derivative it is the most chemically reactive.
Imidazole and benzimidazole are planar molecules and have dipole moments 3.7285 and 3.5528 D respectively.
C4 atom carries the highest negative charge compare with the C2 atom in imidazole.
In all studied molecules N1 carries higher negative charge than N3, but N1 and N3 atoms show the highest negative charge in 2-ethyl derivative.
The hydrogen atom of N-H group is coplanar in all studied molecules.
Vibration frequencies and simulated spectra have been discussed and compared with the measured spectra.
American Psychological Association (APA)
Abbud, Naji Ali& al-Askari, Manal Murad Karim& Said, Bahjat Ali. 2010. Structures and vibrational frequencies of imidazole, benzimidazole and its 2-alkyl derivatives determined by DFT calculations. Basrah Journal of Science،Vol. 30, no. 1C, pp.119-131.
https://search.emarefa.net/detail/BIM-320531
Modern Language Association (MLA)
Abbud, Naji Ali…[et al.]. Structures and vibrational frequencies of imidazole, benzimidazole and its 2-alkyl derivatives determined by DFT calculations. Basrah Journal of Science Vol. 30, no. 1-C (2012), pp.119-131.
https://search.emarefa.net/detail/BIM-320531
American Medical Association (AMA)
Abbud, Naji Ali& al-Askari, Manal Murad Karim& Said, Bahjat Ali. Structures and vibrational frequencies of imidazole, benzimidazole and its 2-alkyl derivatives determined by DFT calculations. Basrah Journal of Science. 2010. Vol. 30, no. 1C, pp.119-131.
https://search.emarefa.net/detail/BIM-320531
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 130
Record ID
BIM-320531