Crystal structure of the dodecanuclear coordination compounds [RE12(DMF)(24)(HCOO)(8)(OH)(16)]I-3 center dot 4DMF (RE = Eu, Nd)

Tambornino, Frank und Hoch, Constantin (2022): Crystal structure of the dodecanuclear coordination compounds [RE12(DMF)(24)(HCOO)(8)(OH)(16)]I-3 center dot 4DMF (RE = Eu, Nd). In: Australian Journal of Chemistry, Bd. 75, Nr. 9: S. 587-594

Abstract

By slow hydrolysis of solutions of [Eu(DMF())8]I-3 or [Nd(DMF)(8)]I-3 in dimethylformamide (DMF), single crystals of the coordination compounds [RE12(DMF)(24) (HCOO)(8)(OH)(16)]I-3 center dot 4DMF (RE = Eu, Nd) were obtained. Both compounds crystallise isotypically in a tetragonal structure with space group I422 (No. 97, Z = 2, a = 21.881(3), 21.6340(10) and c = 20.873(2), 21.0612(9) angstrom for Nd and Eu compounds, respectively). The crystal structure shows a [RE12O56] core unit with O atoms from formate and hydroxide anions mu 3-bridging the metal centres. The dodecanuclear cationic units are arranged in a body-centred packing topology, surrounded by iodide anions in a beta cage pattern. Rietveld refinement confirmed the structure model, and the presence of hydroxide anions was shown by FT-IR spectroscopy. Susceptibility measurements on the Nd compound showed paramagnetic behaviour and a temperature dependence of mu(eff) typical for trivalent Nd cations.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Chemie und Pharmazie > Department Chemie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 540 Chemie
• ISSN: 0004-9425
• Sprache: Englisch