رابطة خماسية

بنية مركب يحوي على رابطة خماسية بين ذرتي كروم في مركب
[CrC6H3-2,6-(C6H3-.2,6-(CHMe2)2)2]2.

الرابطة الخماسية في الكيمياء، هي نوع غير عادي من الروابط الكيميائية بين الذرات، والتي تتضمن الرابطة الخماسية اشتراك عشرة إلكترونات لتشكيل الترابط الكمييائي بين الذرتين.

طرحت فكرة الرابطة الخماسية لأول مرة سنة 2005 لتفسير الترابط بين ذرتي كروم في أحد المركبات الكيميائية،.[1] يؤدي وجود الربيطات إلى تسهيل الارتباط بين مركزي ذرتي الفلز، ويقلل من المسافة بين الذرية. أي أن وجود الربيطات العطرية على الترتيب Ar–Cr2–Ar سهل من الارتباط على هذا الشكل، وأعطى ثباتية للمركب بحيث أن المركب مستقر حتى لدرجات حرارة تصل إلى 200 °س.[2] جرى التأكد من الرابطة الخماسية باستخدام وسائل في الكيمياء النظرية الكمومية وحسب نظرية الكثافة الوظيفية.[3] أظهرت الحسابات أيضاً دور ربيطات تيرفينيل في عدم إضعاف الرابطة..[4]

البنية

تتألف الرابطة الخماسية من الروابط التالية:[5]

بالتالي تختلف الرابطة الخماسية عن الرباعية بوجود رابطة دلتا إضافية ومنفطرة.

انظر أيضاً

للمزيد من الاطلاع

  • * Laura Gagliardi & Björn O. Roos: "Quantum chemical calculations show that the uranium molecule U2 has a quintuple bond", نيتشر, 433, S. 848–851 (24. Februar 2005); دُوِي:10.1038/nature03249; ببمد15729337.
  • Yu-Lun Huang, Duan-Yen Lu, Hsien-Cheng Yu, Jen-Shiang K. Yu, Chia-Wei Hsu, Ting-Shen Kuo, Gene-Hsiang Lee, Yu Wang, Yi-Chou Tsai, Stepwise Construction of the Cr-Cr Quintuple Bond and Its Destruction upon Axial Coordination, Angewandte Chemie International Edition, 2012, Volume 51, Issue 31, S. 7781–7785, دُوِي:10.1002/anie.201202337.

المراجع

  1. ^ Tailuan Nguyen, Andrew D. Sutton, Marcin Brynda, James C. Fettinger, Gary J. Long, Philip P. Power, Synthesis of a Stable Compound with Fivefold Bonding Between Two Chromium(I) Centers, Science 4, November 2005, Vol. 310 no. 5749 S. 844–847. دُوِي:10.1126/science.1116789.
  2. ^ Quintuple Bond Makes Its Debut First stable molecule with fivefold metal-metal bonding is synthesized Steve Ritter, Chemical & Engineering News 26 September 2005 Volume 83, Number 39 نسخة محفوظة 16 يونيو 2018 على موقع واي باك مشين.
  3. ^ Quantum Chemical Study of the Quintuple Bond between Two Chromium Centers in [PhCrCrPh]: trans-Bent versus Linear Geometry Marcin Brynda, Laura Gagliardi, Per-Olof Widmark, Philip P. Power, Björn O. Roos Angewandte Chemie International Edition Published online 3 May 2006 [وصلة مكسورة] نسخة محفوظة 19 يناير 2020 على موقع واي باك مشين.
  4. ^ Large Differences in Secondary Metal−Arene Interactions in the Transition-Metal Dimers ArMMAr (Ar = Terphenyl; M = Cr, Fe, or Co): Implications for Cr−Cr Quintuple Bonding Giovanni La Macchia, Laura Gagliardi, Philip P. Power, and Marcin Brynda, J. Am. Chem. Soc. 2008 ASAP Article دُوِي:10.1021/ja0771890
  5. ^ Sylvester Ndambuki, Tom Ziegler, Analysis of the Putative Cr–Cr Quintuple Bond in Ar′CrCrAr′ (Ar′ = C6H3-2,6(C6H3-2,6-Pri2)2) Based on the Combined Natural Orbitals for Chemical Valence and Extended Transition State Method, Inorg. Chem. 2012, 51 (14), S. 7794–7800, دُوِي:10.1021/ic300824u.

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