Anhydrous Lanthanide Schiff Base Complexes and Their Preparation Using Lanthanide Triflate Derived Amides

Synthesis and characterization of lanthanide complexes bearing a ferrocene-containing N-aryloxo-β-ketoiminate ligand

“…The average NdeO(Ar) bond length of 2.376(5) Å is comparable with the corresponding value in [L ' Nd(OAr)(THF)] 2 (2.371(5) Å) [15]. The NdeN(amido) bond length of 2.337(5) Å is comparable with those values in bketoiminato samarium and erbium amido complexes when the difference in ionic radii is considered [20]. The bond lengths of LneO and LneN in complexes 2 and 4 are comparable with the corresponding bond lengths in complex 1 when the difference in ionic radii is considered.…”

Rare‐Earth Metal Phenyl(trimethylsilyl)amide Complexes

“…[ [24] Our comprehensive studies on bis(dimethylsilyl)amide complexes Ln[N(SiHMe 2 ) 2 ] 3 (thf) 2 revealed that the synthesis of pure compounds is extremely dependent on the solvent, the nature of the alkali metal salt, and choice of the rare-earth metal precursor. [25,26] For example, use of La(OTf) 3 and LiN(SiHMe 2 ) 2 gave complicated product mixtures, while the corresponding reaction with Y(OTf) 3 yielded the tris(amido) derivative Y[N-(SiHMe 2 ) 2 ] 3 (thf) 2 only contaminated with LiOTf [25] and the donor solvent-free ate complex {Y[N(SiHMe 2 ) 2 ] 4 Li} 2 .…”

f,f Homodinuclear and d,f or f,f′ Heterodinuclear Complexes with a [2+2] Macrocyclic Compartmental Schiff Base

“…The distances within the metal ion coordination sphere are: Lu-O1 2.251(3), Lu-N1 2.383(4), Lu-N2 2.660(4), Lu-N3 2.400(4), Lu-O2, 2.167(3), Lu-O3 2.1667(3), and Lu-O1Ј 2.242(3) ( Table 1), which are comparable to those observed in the dinuclear Schiff base (SB) complex of the general formula Ln 2 (O 2 N 2 C 13 H 20 ) 3 (Ln = Nd, Sm, Er) [12] exhibiting seven coordination around the metal ion and in other analogous Ln(SB) 3 complexes. [13,14] …”

“…The free chamber, owing to the presence of a NH group, undergoes ring contraction with the formation of an additional five-membered ring. [8] In this paper, 2,6-diformyl-4-X-phenol (X = -CH 3 , -Cl) and N,N-bis(2-aminoethyl)-2-hydroxybenzylamine·3HCl were successfully employed in the synthesis of the related [2+2] macrocyclic derivatives, capable of forming, thanks to the coordinating ability of the phenol group appended to the central nitrogen atom of the diamine precursor, stable mononuclear lanthanide(III) complexes that can evolve into f,f homodinuclear and f,fЈ or d,f heterodinuclear species whose physicochemical properties were examined by envi-ronmental scanning electron microscope energy-dispersive X-ray spectroscopy (ESEM-EDS), IR, 1 H, and 13 C NMR spectroscopy, and ESI-MS data. In the past, the use of similar ligands, without these lateral coordinating functionalities, often resulted in mixtures of complexes in consequence of transmetalation, site migration, and demetalation reactions.…”