Two 3D network complexes of Y(III) and Ce(III) with 2-fold interpenetration and reversible desorption–adsorption behavior of lattice water

Two novel inorganic–organic 3D network, namely{[Ln(L)1.5(H2O)2]·5H2O}n [Ln=Y (1), Ce (2)] [Ln(L)1.5(H2O)2]·5H2O [Ln=Y (1), Ce (2)], have been prepared through the assembly of the ligand 1,2-bis[3-(1,2,4-triazolyl)-4-amino-5-carboxylmethylthio]ethane (H2L) and lanthanide (III) salts under hydrothermal condition and structurally characterized by single-crystal X-ray diffractions. In complexes 1 and 2, the L2− anions adopt three different coordination fashions (bidentate chelate, bidentate bridging and bidentate chelate bridging) connecting Ln(III) ions via the oxygen atoms from carboxylate moieties. Both 1 and 2 exhibit 3D network structures with 2-fold interpenetration. Interestingly, the reversible desorption–adsorption behavior of lattice water is significantly observed in the two compounds. The result shows their potential application as late-model water absorbent in the field of adsorption material.