Abstract
The reaction, in a gel medium, of Er(III) chloride with the trisodium salt of benzene-1,3,5-tricarboxylic acid (H 3TMA) yielded three different kind of crystals. All three have been structurally characterized. ErTMA(H 2O) 5·3.5H 2O ( 1) crystallizes in C2/ c with a=14.7396(15), b=16.9874(15), c=14.4591(14) Å, β=118.754(9)° and Z=8. Its crystal structure has been reported elsewhere already. It consists of juxtaposed criss–cross chains. ErTMA(H 2O) 3·1.5H 2O ( 2) has been found to be isostructural to the Gd(III) complex reported already. It crystallizes in C2/ c with a=20.452(2), b=9.973(1), c=15.251(1) Å, β=125.68° and Z=8. Its structure consists of parallel double-sheet networks based on honeycomb-like motifs. Er 3TMA 3(H 2O) 8·4H 2O ( 3) crystallizes in P1̄ with a=9.988(2), b=15.656(3), c=19.698(3) Å, α=110.77(2), β=100.63(2), γ=100.58(2)° and Z=2. Its structure consists of parallel tube like layers based on the honeycomb-like molecular motifs already observed in 2. The crystal structure is reported herein. A predominant phase diagram has been established versus the concentrations of the gel medium and of the solutions. Heating one of them progressively liberates water molecules, which finally leads to ErTMA ( 4), which can reversibly bind water reforming 1.
Published Version
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