Exceptionally low shear modulus in a prototypical imidazole-based metal-organic framework

Jin Chong Tan, Bartolomeo Civalleri, Chung Cherng Lin, Loredana Valenzano, Raimondas Galvelis, Po Fei Chen, Thomas D. Bennett, Caroline Mellot-Draznieks, Claudio M. Zicovich-Wilson, Anthony K. Cheetham

研究成果: 雜誌貢獻期刊論文同行評審

210 引文 斯高帕斯(Scopus)

摘要

Using Brillouin scattering, we measured the single-crystal elastic constants (C ij's) of a prototypical metal-organic framework (MOF): zeolitic imidazolate framework (ZIF)-8 [Zn(2-methylimidazolate) 2], which adopts a zeolitic sodalite topology and exhibits large porosity. Its C ij's under ambient conditions are (in GPa) C 11=9.522(7), C 12=6.865(14), and C 44=0.967(4). Tensorial analysis of the C ij's reveals the complete picture of the anisotropic elasticity in cubic ZIF-8. We show that ZIF-8 has a remarkably low shear modulus G min1GPa, which is the lowest yet reported for a single-crystalline extended solid. Using ab initio calculations, we demonstrate that ZIF-8's C ij's can be reliably predicted, and its elastic deformation mechanism is linked to the pliant ZnN 4 tetrahedra. Our results shed new light on the role of elastic constants in establishing the structural stability of MOF materials and thus their suitability for practical applications.

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文章編號095502
期刊Physical Review Letters
108
發行號9
DOIs
出版狀態已出版 - 29 2月 2012

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