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Article Dans Une Revue CrystEngComm Année : 2021

Lanthanide-based molecular alloys with hydroxyterephthalate: A versatile system

Résumé

Reactions in water between lanthanide chlorides and the disodium salt of 2-hydroxyterephthalic acid (H2hbdc) lead to six families of lanthanide-based coordination polymers depending on the lanthanide ion and the crystal growth method. Compounds that constitute family F1 have the general chemical formula [Ln(Hhbdc)(hbdc)·9H2O]∞ with Ln = La-Nd and have been obtained by slow evaporation. [Ln2(hbdc)3(H2O)6·4H2O]∞ with Ln = Sm-Eu constitute family F2 and have been obtained by solvothermal synthesis. Family F3 includes compounds, obtained by a solvothermal method, with the general chemical formula [Ln2(hbdc)3(H2O)4·4H2O]∞ with Ln = Ho-Lu plus Y and compounds obtained by slow diffusion through gels with Ln = Eu-Tb. [Ln(Hhbdc)(hbdc)(H2O)3·H2O]∞ with Ln = Tb-Dy have been obtained by solvothermal methods and constitute family F4. [Gd2(hbdc)3(H2O)8·6H2O]∞ (F5) has been obtained by slow evaporation. The last family (F6) includes compounds with the general chemical formula [Ln2(hbdc)3(H2O)8·2H2O]∞ with Ln = Nd-Tb that have been obtained by slow diffusion through gel media. Gd-Based micro-crystalline powders can be obtained by direct mixing of aqueous solutions of Gd3+ and hbdc2-. Unexpectedly, the micro-crystalline powder belongs to F5 when the lanthanide solution is added to the ligand one and to F6 when the opposite occurs. This phenomenon is also observed for the Tb- and/or Eu-based heterolanthanide coordination polymers. Their optical properties have been studied in detail.
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Dates et versions

hal-03130424 , version 1 (22-02-2021)

Identifiants

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J. Wang, Yan Suffren, C. Daiguebonne, Kevin Bernot, Guillaume Calvez, et al.. Lanthanide-based molecular alloys with hydroxyterephthalate: A versatile system. CrystEngComm, 2021, 23 (1), pp.100-118. ⟨10.1039/d0ce00947d⟩. ⟨hal-03130424⟩
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