Academic Journal

Mixed metal node effect in zeolitic imidazolate frameworks

التفاصيل البيبلوغرافية
العنوان: Mixed metal node effect in zeolitic imidazolate frameworks
المؤلفون: Madsen, Rasmus Skov Klitgaard, Stepniewska, Malwina, Yang, Yongjian, Qiao, Ang, Winters, Wessel Martinus Wilhelmus, Zhou, Chao, König, J., Mauro, J.C., Yue, Yuanzheng
المصدر: Madsen , R S K , Stepniewska , M , Yang , Y , Qiao , A , Winters , W M W , Zhou , C , König , J , Mauro , J C & Yue , Y 2022 , ' Mixed metal node effect in zeolitic imidazolate frameworks ' , RSC Advances , vol. 12 , no. 17 , pp. 10815–10824 . https://doi.org/10.1039/d2ra00744d
سنة النشر: 2022
المجموعة: Aalborg University (AAU): Publications / Aalborg Universitet: Publikationer
الوصف: We synthesized two series of bimetallic (zinc and cobalt) zeolitic imidazolate frameworks (ZIF-62) under different solvothermal conditions. It is found that the structure of the derived ZIF crystals is highly sensitive to synthesis conditions. One series possesses the standard ZIF-62 structure, whereas the other has a mixed structure composed of both the standard structure and an unknown one. The standard series exhibits a slight negative deviation from linearity of melting temperature ( T m) and glass transition temperature ( T g) with the substitution of Co for Zn. In contrast, the new series displays a stronger negative deviation. These negative deviations from linearity indicate the mixed metal node effect in bimetallic ZIF-62 due to the structural mismatch between Co 2+ and Zn 2+ and to the difference in their electronic configurations. The new series involves both cobalt-rich and zinc-rich phases, whereas the standard one shows one homogeneous phase. Density functional theory calculations predict that the substitution of Co for Zn increases the bulk modulus of the ZIF crystals. This work indicates that the structure, melting behaviour, and mechanical properties of ZIFs can be tuned by metal node substitution and by varying the synthetic conditions. Both series of ZIFs have higher glass forming abilities due to their higher T g/ T m ratios (0.77-0.84) compared to most good glass formers.
نوع الوثيقة: article in journal/newspaper
وصف الملف: application/pdf
اللغة: English
DOI: 10.1039/d2ra00744d
الاتاحة: https://vbn.aau.dk/da/publications/ed3263d0-2181-4078-96db-80d40065e324
https://doi.org/10.1039/d2ra00744d
https://vbn.aau.dk/ws/files/468179199/2022RSC_Adv_Madsen_et_al.pdf
http://www.scopus.com/inward/record.url?scp=85129446537&partnerID=8YFLogxK
Rights: info:eu-repo/semantics/openAccess
رقم الانضمام: edsbas.9C1EE292
قاعدة البيانات: BASE