Tris(tetrahydrofuran-κO)tris[tris(thiophen-2-yl)methanolato-κO]terbium(III) tetrahydrofuran monosolvate

Abstract

In the mononuclear title compound, [Tb(C13H9OS3)3(C4H8O)3]·C4H8O, the lanthanide cation is located on a threefold rotation axis and is surrounded by electron-rich ligands in an approximately octa­hedral geometry. One of the thienyl groups and the bound THF are disordered with 0.5:0.5 occupancy. The free THF is disordered around the threefold axis.

New Yttrium and Europium(+3) Alkoxides Bearing Thiophene Units: Syntheses, Crystal Structure Determinations and Physico‐Chemical Properties

“…It is surrounded by three tris(2‐thienyl)methoxido ligands and by three tetrahydrofuran molecules in a facial arrangement (Figure 2). This facial coordination geometry around the metal centre is similar to previously published neodymium, samarium and terbium(+3) alkoxide containing thiophene moieties 9,15–18. A solvent molecule is also present in the crystal lattice with no interaction with the molecule.…”

“…Selected bond lengths and angles for 11 and 12 are assembled in Table 1. These X‐ray crystal structure determinations confirm the clear difference to the corresponding lanthanide compounds which have a distorted octahedral environment around the metal centres with facial arrangement of the methoxide ligands 9,15–17…”

“…The Eu–OC(C 4 H 3 S) 3 and Eu–O(thf) bond lengths (2.142(2) and 2.564(2) Å, respectively) are longer than those observed for {Tb[OC(C 4 H 3 S) 3 ] 3 (thf) 3 } · thf (2.129(2) and 2.543(2) Å, respectively)15 and shorter than the value obtained for {Nd[OC(C 4 H 3 S) 3 ] 3 (thf) 3 } · thf (2.186(1) and 2.620(2) Å, respectively) 9. The (C 4 H 3 S) 3 OC–Eu–OC(C 4 H 3 S) 3 , O(thf)–Eu–OC(C 4 H 3 S) 3 and O(thf)–Eu–O(thf) angle values are very similar to those found for {Nd[OC(C 4 H 3 S) 3 ] 3 (thf) 3 } · thf and {Tb[OC(C 4 H 3 S) 3 ] 3 (thf) 3 } · thf 9,15…”

“…Pale red crystals of 15 were obtained in a concentrated tetrahydrofuran solution placed at 5 °C. The yield after crystallization was 17 % 9,15–17…”

“…In previous papers, we presented the synthesis and X‐ray crystal structure analyses of some rare earth alkoxides (Y 3+ , Nd 3+ , Sm 3+ and Tb 3+ ) bearing thiophene moieties 9,15–17. Moreover, for the lanthanide compounds, their electrochemical and luminescence properties were also investigated 17–18.…”