مطالعه نظری توتومری شدن 3, 4-دی هیدرو پیریمیدین-2 (اH)-ایمین با استفاده از مدل های حلال آشکار و قفس حلال

نوع مقاله : علمی-پژوهشی

نویسنده

گروه شیمی، واحد شاهرود، دانشگاه آزاد اسلامی، شاهرود، ایران

چکیده

در این تحقیق توتومری­شدن مولکول 3, 4-دی هیدرو پیریمیدین-2(اH)-ایمین(3,4DHP) به 1, 6-دی هیدرو پیریمیدین-2-آمین(1,6DHP) و به 1, 4-دی هیدرو پیریمیدین-2-آمین (1,4DHP)در سطح محاسباتی B3LYP/6-31++G(d, p) در دمای 15/298 کلوین مورد مطالعه قرار گرفته است. هر یک از این دو فرایند با دو مکانیسم پیشنهادی بررسی شدند. مکانیسم اول (مکانیسم A) انتقال مستقیم هیدروژن از طریق حالت­های گذار چهار عضوی TS13 و TS24 است که مسیرهای p(a) و p(b) نامیده می­شوند. مکانیسم دوم (مکانیسم B) تشکیل سه دیمر و انتقال همزمان دو هیدروژن از طریق حالت­ های گذار TS1133، TS1324 و TS2224 است. نتایج نشان می­ دهد که در فاز گازی انرژی مورد نیاز برای تبدیل توتومرها از طریق مکانیسم A در دو مسیر p(a) و  p(b) به دلیل فشار موجود در حلقه چهار عضوی حالت­ های گذار مربوطه نسبتا بالا بوده و به ترتیب برابر 31/38 و 29/40 کیلوکالری برمول است. در حالیکه انرژی مورد نیاز برای غلبه بر سد انرژی در حالت­های گذار TS1133، TS1324 و TS2224 بسیار کمتر بوده و به ترتیب برابر با 01/7 ،19/ 8 و 98/8 کیلوکالری برمول است. برای بررسی اثر حلال بر سینتیک و ترمودینامیک فرایند توتومری در مسیرهای p(a) و  p(b) مدل­ های حلال آشکار، قفس حلال و ترکیب آن دو، در حلا­­ل­ های متفاوت (پروتون دهنده و غیر پروتون دهنده) مورد بررسی قرار گرفت. نتایج نشان می­ دهد که بکارگیری حلال قطبی پروتون دهنده، سد انرژی حالت­ های گذار مربوطه را به مقدار بسیار قابل توجهی کاهش می ­دهد.

کلیدواژه‌ها

موضوعات


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