دراسة كهربائية لتقدير ثابت التاين والمتغيرات الثيرموداينمكية لقواعد شيف المشتقة من 2-nitrobenzaldehyde وتقيم الفعالية البيولوجية

القسم: Article

الملخص

تتضمن الدراسة استخدام المركب (2-nitrobenzaldehyde) كنواة أساسية لتحضير ثلاث قواعد شيف فينولية والمحتوية على مجموعة هيدروكسيل في المواقع (اورثو، ميتا وبارا) على جهة الأمين الاولي تم اثبات الهيئات التركيبية للقواعد بواسطة أطياف IR، UV ،H1NMR ودرجات الانصهار. الهدف الرئيسي للدراسة هو تعيين قيم (Ka) لهذه القواعد المذكورة في مدى من درجات الحرارة بين (20-60 C°) وباستعمال طريقة المواصلة الكهربائية والتي تعتبر من الطرق الدقيقة والمضبوطة. أظهرت النتائج زيادة الحامضية مع ارتفاع درجة الحرارة مع الحفاظ على ترتيب ثابت للقيم في جميع الدرجات الحرارية المدروسة، وبينت دراسة ثيرموداينميكية التأين ان عملية التأين للقواعد في مذيب الماء هي غير تلقائية ΔG) (+، ماصة للحرارة ΔH) (+ ومصحوبة بزيادة الانتظام ΔS) (-. كما تم متابعة تحليل أثر التباين الحراري على قيم التوصيل المكافئ عند التخفيف اللانهائي مع تحليل مفصل للنتائج. اما تقييم الفعالية البيولوجية فقد اثبتت تفاوتاً ملحوظاً في التثبيط ضد بكتيريا (S. aureus, E.coli) حيث سجل المركب (N1) اعلى نشاطاً بقطر (19mm) للموجبة و(7mm) للسالبة، تلاه (N2) (18mm) للموجبة، بينما حقق المركب (N3) فعالية متوازنة بلغت بقطر (16mm) و ((15mm على التوالي. تبرز هذه النتائج الرقمية والدلالات الثيرموداينميكية الإمكانيات الواعدة لهذه المركبات في التطبيقات الكيميائية والحيوية.

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المعرفات

معرف الكائن الرقمي DOI: 10.33899/berj.2026.Vol22.Iss3.61528

تنزيل هذا الملف

الإحصائيات

طريقة الاقتباس

دراسة كهربائية لتقدير ثابت التاين والمتغيرات الثيرموداينمكية لقواعد شيف المشتقة من 2-nitrobenzaldehyde وتقيم الفعالية البيولوجية . (2026). مجلة ابحاث كلية التربية الاساسية, 22(3), 355-376. https://doi.org/10.33899/berj.2026.Vol22.Iss3.61528