Neodym(III)komplexe mit stark raumerfüllenden Cyclopentadienyl- und Benzamidinat-Liganden: Ein Vergleich

Recknagel, Anja; Knösel, Friedrich; Noltemeyer, M.; Edelmann, Frank T.; Behrens, Ulrich

doi:10.1016/0022-328x(91)80196-q

Cited by 64 publications

(21 citation statements)

References 18 publications

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“…The lithium atom in 5 is coordinated by one dme molecule and in complex 6 by two thf molecules. The four Ln–N distances in compounds 4 – 6 have rather similar values [ 4 : 2.331(1)–2.369(1); 5 : 2.454(3)–2.573(3); 6 : 2.404(2)–2.481(2) Å], and the average bond lengths are comparable to those reported for related bis(amidinate) complexes (Y,3a,12a Nd,2c Sm18).…”

Section: Resultssupporting

confidence: 68%

Lanthanide Complexes Coordinated by a Dianionic Bis(amidinate) Ligand with a Rigid Naphthalene Linker

et al. 2010

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The synthetic pathway to a new bis(amidine) ligand with a conformationally rigid naphthalene linker, 1,8‐C10H6[NHC(tBu)=N(2,6‐Me2–C6H3)][N=C(tBu)NH(2,6‐Me2–C6H3)] (3) was elaborated. Deprotonation of this bis(amidine) ligand with two equivalents of nBuLi and subsequent reaction with anhydrous LnCl3 (Ln = Y, Nd, Sm) allowed the synthesisof the chlorido complexes [1,8‐C10H6{NC(tBu)N‐2,6‐Me2–C6H3}2]YCl(dme) (4), [1,8‐C10H6{NC(tBu)N‐2,6‐Me2–C6H3}2]Nd(dme)(μ‐Cl)2Li(dme) (5), and [1,8‐C10H6{NC(tBu)N‐2,6‐Me2–C6H3}2]Sm(thf)(μ‐Cl)2Li(thf)2 (6), which are coordinated by the linked dianionic bis(amidinate) ligand. The structures of complexes 4–6 were established by X‐ray diffraction studies, which reveal that the new ligand framework can coordinate to the lanthanide atoms in different fashions depending on the central atom ion size. Alkylation of complex 6 with equimolar amounts of LiCH2SiMe3 afforded the unexpected amido–amidinate complex [{1,8‐C10H6(NC(tBu)N‐2,6‐Me2–C6H3)2}{1,8‐C10H6(NC(tBu)N‐2,6‐Me2–C6H3)(NH)}Sm][Li(dme)3] (7), which obviously results from the cleavage of one amidinate group during decomposition of the transient alkyl species and ligand redistribution.

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Section: Resultssupporting

confidence: 68%

Lanthanide Complexes Coordinated by a Dianionic Bis(amidinate) Ligand with a Rigid Naphthalene Linker

et al. 2010

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“…2) make the preparation of sodium analogues of paramount synthetic importance. The incorporation of lithium halides is a prominent feature within highly polar electropositive metal organoamide [46] and amidinate/guanidinate systems [38,[47][48][49][50], accordingly, THF and DME solutions of HFXyl, HFPhEt and HFIso were treated with one equivalent of sodium bis(trimethylsilyl)amide and evaluated for ÔcompleteÕ metallation.…”

Section: Sodium Complexesmentioning

confidence: 99%

Lithium and sodium N,N′-di(2,6-dialkylphenyl)formamidinate complexes

Cole

Davies

Jones

et al. 2004

Journal of Organometallic Chemistry

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“…Since all the LnCl 3 dissolved, it suggests that the heteroleptic species is formed initially, possibly stabilised as an ''ate'' complex such as A in Scheme 4. The formation of ''ate'' complexes has previously been observed for other bulky organoamidolanthanoids, for example [Yb{Me 2 Si(OtBu)(NtBu)} 2 (µ-Cl) 2 Li(THF) 2 ] [36] and [42] Therefore the rearrangement presumably occurs on addition of hexane [or for L 2 , Ln ϭ Yb, toluene (even with isolated LiL 2 ); for Ln ϭ La, also diethyl ether; Scheme 4 (iii)] with precipitation of LiCl and LnCl 3 or even LiLnCl 4 . This is contrary to the in situ [Ln(enЈ) 2 (µ-Cl)] 2 preparations where the heteroleptic derivatives were obtained from hexane.…”

Section: 2e·(phme)]mentioning

confidence: 99%

Solvent-Free Lanthanoid Complexes Derived From Chelation-Supported Organoamide Ligands

Deacon¹,

Forsyth²,

Scott³

2002

Eur. J. Inorg. Chem.

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Treatment of LnCl 3 with three molar equivalents of LiL [(L = N-(2-methoxyphenyl)-N-(trimethylsilyl)amide (L 1 ) or N-(2-phenoxyphenyl)-N-(trimethylsilyl)amide (L 2 )], generated in situ from LH and nBuLi, or with the isolated lithium complex [Li(L 1 )(OEt 2 )] 2 (for Ln = Yb) in THF afforded the solvent-free homoleptic complexes [Ln(L) 3 ] [Ln = Yb (1a), Er (1b), Sm (1c), Pr (1d), Nd (1e), L = L 1 ; Ln = Yb (2a), Y (2b), Sm (2c), Nd (2d), La (2e), L = L 2 ). With a 2:1 LiL (generated in situ) to LnCl 3 molar ratio, the solvent-free heteroleptic complexes [Ln(L) 2 (µ-Cl)] 2 were obtained for L = N,N-dimethyl-NЈ-trimethylsilylethane-1,2-diaminate (enЈ) [Ln = Yb (3a), Er (3b), Sm (3c), Nd (3d), La (3e)], but not for L 1 or L 2 , which gave [Ln(L) 3 ] [Ln = Yb (1a), Nd (1e), L = L 1 ; Ln = Yb (2a), Nd (2d), La (2e), L = L 2 ]. However, treatment of LnCl 3 with two molar equivalents of the isolated crystalline lithium salt [Li(L 1 )(-OEt 2 )] 2 in THF gave, for the heavier lanthanoids, the solventfree heteroleptic complexes [Ln(L 1 ) 2 (µ-Cl)] 2 [Ln = Yb (4a), Er (4b), Tb (4c)], although the homoleptic complex [Nd(L 1 ) 3 ] (1e)

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Neodym(III)komplexe mit stark raumerfüllenden Cyclopentadienyl- und Benzamidinat-Liganden: Ein Vergleich

Cited by 64 publications

References 18 publications

Lanthanide Complexes Coordinated by a Dianionic Bis(amidinate) Ligand with a Rigid Naphthalene Linker

Lanthanide Complexes Coordinated by a Dianionic Bis(amidinate) Ligand with a Rigid Naphthalene Linker

Lithium and sodium N,N′-di(2,6-dialkylphenyl)formamidinate complexes

Solvent-Free Lanthanoid Complexes Derived From Chelation-Supported Organoamide Ligands

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