A new family of bimetallic framework materials showing reversible structural transformations
(2009) Crystal Growth & Design — Vol. 9, n° 7, p. 3104-3110 (2009)
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- Abstract
- Three new bimetallic framework compounds, namely, (([Cd 3(tn) 4][Co(CN) 6] 2) · 5H 2O) ∞ (1), ([Cd(tn)] 3[Cr(CN) 6] 2) ∞(2), and ([Cu 2(tn) 2][Ru(CN) 6] · 4H 2O) ∞ (3), have been prepared in a very simple manner from the ligand 1,3-diaminopropane (tn), the hexacyanometalates [Co(CN) 6] 3-, [Cr(CN) 6] 3- and [Ru(CN) 6] 4-, and a metal(II) sulfate (M IISO 4:M = Cd 2+, Cu 2+). They have been characterized by IR, X-ray diffraction, elemental analysis and immersion calorimetry. All three compounds have three-dimensional structures, with both the organic ligand and the cyanide groups acting as bridges. Compounds 1 and 3 have channels occupied by water molecules of crystallization. All three complexes are stable indefinitely when exposed to the air at room temperature; however, when compounds 1 and 3 are heated, they lose the water molecules of crystallization. The powder X-ray diffractograms of these dried and as yet unknown species are different from those of the original compounds. However, in a humid atmosphere both dried compounds readsorb water molecules and revert to the original structures, as shown by powder X-ray diffraction measurements. The adsorption properties of compounds 1 and 3 were studied using immersion calorimetry and in situ powder X-ray diffraction. In the case of compound 3 the heat of the structural transformation on rehydration was found to be ca. 19 ± J/g. © 2009 American Chemical Society.
- Affiliations
ESRF, Grenoble (France) Chimie
Citations
Sereda, O., Stoeckli, F., Stoeckli-Evans, H., Dolomanov, O., Filinchuk, Y., & Pattison, P. (2009). A new family of bimetallic framework materials showing reversible structural transformations. Crystal Growth & Design, 9(7), 3104-3110. https://doi.org/10.1021/cg800883x (Original work published 2009)