Journal
INORGANICA CHIMICA ACTA
Volume 559, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2023.121768
Keywords
Aminopyridine ligands; N-ligands; Lanthanides; Lanthanum; Reduction; Single crystal
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In this study, two rare tris(amiopyridinate) La(III) complexes were synthesized and one of them was analyzed by X-ray. The attempted reduction of one complex to obtain a La(II) complex led to the formation of a lanthanoid-potassium complex instead.
Treatment of three equivalents of potassium salts of N-arylated 2-pyridyl amines, [HN(C6H3Pri2-2,6)(2-C5H3N)] (1) and [HN(C6H3Pri2-2,6)(2-C5H3N-6-Me)] (2) with anhydrous LaBr3 in tetrahydrofuran (THF), afforded after workup in hexane the corresponding rare examples of tris(amiopyridinate) La(III) complexes, [La{N(C6H3Pri2- 2,6)(2-C5H3N)}3(thf)] (3) and [La{N(C6H3Pri2-2,6)(2-C5H3N-6-Me)}3] (4) in 77% and 71% yields, respectively. X-ray analysis of 4 further confirms the monomeric nature in the solid state. Owing to the low steric bulk of the aminopyridine ligand in 3, one thf ligand is coordinated to La atom. Attempted reduction of 3 with KC8 in the presence of 12-crown-4-ether to synthesize the corresponding La(II) complex, instead resulted in the formation of [La{N(C6H3Pri2-2,6)(2-C5H3N)}4{K(12-crown-4-ether)] (5). In contrast, the analogous reaction with 4 led to [K {N(C6H3Pri2-2,6)(2-C5H3N-6-Me)}{(12-crown-4-ether)2}] along with unidentified products. Complex 5 is the first example of mononuclear tetrakis(aminopyridinate) lanthanoidate complexes.
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