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Compositional inhomogeneity and tuneable thermal expansion in mixed-metal ZIF-8 analogues
Authors:
Adam F.
Sapnik
(University of Oxford)
,
Harry S.
Geddes
(University of Oxford)
,
Emily M.
Reynolds
(University of Oxford)
,
Hamish H.-m.
Yeung
(University of Oxford)
,
Andrew L.
Goodwin
(University of Oxford)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Chemical Communications
, VOL 13
State:
Published (Approved)
Published:
August 2018
Diamond Proposal Number(s):
13284
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.
Subject Areas:
Chemistry
Instruments:
I11-High Resolution Powder Diffraction