Abstract
The reaction, in a gel medium, of Sm(III) chloride with the trisodium salt of benzene-1,3,5-tricarboxylic acid (H 3TMA) yielded three different kinds of crystals. All three have been structurally characterized. 1, namely SmTMA(H 2O) 6 crystallizes in Cc with a=11.4818(12) Å, b=18.062(2) Å, c=7.219(1) Å, β=118.5432(11)° and Z=4. Its crystal structure has been found to be isostructural to the Y(III) complex already reported. It consists of juxtaposed ribbon-like molecular motifs. 2, namely SmTMA(H 2O) 5·H 2O has been found to be isostructural to the Er(III) complex already reported. It crystallizes in P-1 with a=7.6305(15) Å, b=9.9654(15) Å, c=11.219(2) Å, α=106.98°, β=103.52(2)°, γ=107.50(2)° and Z=2. Its structure consists of juxtaposed chains. 3, namely Er 3TMA 3(H 2O) 3·1.5H 2O crystallizes in C2/ c with a=20.511(2) Å, b=10.020(1) Å, c=15.294(2) Å, β=125.53(1) and Z=8. Its structure consists of parallel double-sheet networks based on honeycomb-like motifs. Heating 1 liberates water molecules and finally leads to SmTMA, namely 4, which can reversibly bind water reforming 1.
Published Version
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