Application of spectroscopy and positron annihilation methods in studies of the gel-glasses materials

Legendziewicz, J.; Guzik, M.; Gliński, Jacek; Jerie, K.; Baranowski, A.; Kochel, Andrzej

doi:10.1016/j.jallcom.2007.04.129

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…The Lu–Cl–Lu angles in 5 are comparatively small at 86.77(3)–87.10(3)°, which might be due to the unique Lu 2 Cl 3 cage architecture instead of the planar Lu 2 Cl 2 ring present in the reference compounds. Similar Ln 2 Cl 3 motifs as in 5 have been observed in, for example, [Pr 2 (µ‐Cl) 3 (DME) 6 ] 3+ , [Nd 2 (µ‐Cl) 3 Cl 6 ] 3–[61] and [Sm 2 (µ‐Cl) 3 Cl{HC(CMeNDipp) 2 } 2 (THF)], whereas literature examples of the late‐lanthanide metals are lacking. In contrast to 4 , the crystal structure of 5 comprises separated ions instead of contact ion pairs in which the Li + cation is fully solvated by three chelating DME molecules.…”

Section: Resultssupporting

confidence: 57%

Lanthanide(III) Sandwich and Half‐Sandwich Complexes with Bulky Cyclooctatetraenyl Ligands: Synthesis, Structures, and Magnetic Properties

et al. 2017

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Five new lanthanide(III) sandwich and half‐sandwich complexes with bulky cyclooctatetraenyl ligands have been prepared and fully characterized, including single‐crystal X‐ray structure determination. The treatment of anhydrous lanthanide(III) chlorides, LnCl3 (Ln = Pr, Tb, Yb), with 2 equivalents of Li2COT′′ [COT′′ = 1,4‐bis(trimethylsilyl)cyclooctatetraene dianion] followed by crystallization in the presence of a coordinating solvent afforded the anionic sandwich complexes [Li(THF)4][Pr(COT′′)2] (1), [Li(DME)3][Tb(COT′′)2] (2; DME = 1,2‐dimethoxyethane), and [Li(TMEDA)2][Yb(COT′′)2] (3; TMEDA = N,N,N′,N′‐tetramethylethylenediamine). Attempted oxidation of 2 with silver iodide did not afford the neutral terbium(IV) sandwich complex [Tb(COT′′)2]. Instead, the tri(µ‐iodido)‐bridged dinuclear half‐sandwich complex [Li(DME)2][Tb2(µ‐I)3(COT′′)2] (4) was isolated in 72 % yield. In this complex, the Li(DME)2 fragment is attached to one of the µ‐iodido ligands. A closely related binuclear lutetium complex, [Li(DME)3][Lu2(µ‐Cl)3(COTbig)2]·DME (5), was obtained by using the “superbulky“ COTbig ligand [COTbig = 1,4‐bis(triphenylsilyl)cyclooctatetraenyl dianion]. In addition to the spectroscopic and structural characterization, the magnetic properties of the paramagnetic terbium(III) derivative 2 have been investigated and further complemented by ab initio computational methods. These results have been used to discuss the structural requirements for potential terbium(III) single‐ion magnets.

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Section: Resultssupporting

confidence: 57%