Compositional inhomogeneity and tuneable thermal expansion in mixed-metal ZIF-8 analogues.
Chem Commun (Camb)
; 54(69): 9651-9654, 2018 Aug 23.
Article
en En
| MEDLINE
| ID: mdl-30101236
ABSTRACT
We study the structural and thermomechanical effects of cation substitution in the compositional family of metal-organic frameworks Zn1-xCdx(mIm)2 (HmIm = 2-methylimidazole). We find complete miscibility for all compositions x, with evidence of inhomogeneous distributions of Cd and Zn that in turn affect framework aperture characteristics. Using variable-temperature X-ray powder diffraction measurements, we show that Cd substitution drives a threefold reduction in the magnitude of thermal expansion behaviour. We interpret this effect in terms of an increased density of negative thermal expansion modes in the more flexible Cd-rich frameworks.
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01-internacional
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MEDLINE
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En
Revista:
Chem Commun (Camb)
Asunto de la revista:
QUIMICA
Año:
2018
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Article