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- W2738861961 abstract "The two-dimensional (2-D) catena-{Co(amp)3Cr(ox)3·6H2O}(amp = 2-picolylamine, ox = oxalate) compound is built by the [Co(amp)3]3+ (D) and [Cr(ox)3]3– (A) ions via multiple hydrogen bonds and hosts well-resolved R12 dodecameric discrete water cluster rings between its stacked layers. It undergoes reversible single crystal to single crystal transformation upon dehydration and rehydration in air, both processes being correlated to gradual changes from brown (hydrated phase) to green (dehydrated phase) and vice versa. The water uptake mass of this compound is 0.13 g/g of sample, and the rehydration process needs 90 min. The rate limiting step of the rehydration process is the diffusion of the water molecules into the framework of the dehydrated phase because the latter does not have voids. The 2-D catena-{Co(amp)3Cr(ox)3·6H2O} can undergo many cycles of dehydration/rehydration (breathing) processes without losing its crystallinity. During these processes, its unit cell contracts and expands by 9.39% along the a axis, 12.22% along b, and 2.03% along c for a total volume change of 22.03%. The breakage and formation of some hydrogen bonds in the compound take place alongside the processes, especially along the b axis, which is the main direction of modification of the unit cell. One of these hydrogen bonds is responsible for the modification of the coordination polyhedron around the chromium(III) ions which becomes less distorted and provokes the gradual thermochromic property observed in this compound." @default.
- W2738861961 created "2017-07-31" @default.
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- W2738861961 date "2017-08-11" @default.
- W2738861961 modified "2023-10-09" @default.
- W2738861961 title "Reversible Breathing Process and Associated Thermochromism of a Stacked-Layer Porous Supramolecular Material" @default.
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- W2738861961 doi "https://doi.org/10.1021/acs.cgd.7b00856" @default.
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