2019/09/09 by Nicole Harmgarth, Phil Liebing, Liane Hilfert +4
Chemistry · #Coordination Chemistry and Organometallics #Inorganic Chemistry and Materials #Organometallic Complex Synthesis and Catalysis
paper · pdf · doi:10.1002/zaac.201900141
openalex publication_date 2019/09/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
New homoleptic complexes of selected rare‐earth elements containing the unsymmetrically substituted amidinate ligand [MeC(NEt)(N t Bu)] – [= (L) – ] were synthesized and fully characterized. Treatment of in situ‐prepared Li(L) ( 1 ) with anhydrous lanthanide(III) chlorides, Ln Cl 3 ( Ln = Sc, La, Ce, Ho), afforded three different types of amidinate complexes depending on the ionic radius of the central metal atom. The large La 3+ formed the octa‐coordinate DME solvate La(L) 3 (DME) ( 2 ). Using Ce 3+ , the octa‐coordinate “ate” complex Li(THF)[Ce(L) 4 ] ( 3 ) was formed. Depending on the crystallization conditions, compound 3 could be crystallized in two modifications differing in the coordination environment around Li. In the case of the smaller Sc 3+ and Ho 3+ ions, six‐coordinate homoleptic Sc(L) 3 ( 4 ) and Ho(L) 3 ( 5 ) were isolated. The title compounds were fully characterized by spectroscopic and analytical methods as well as single‐crystal X‐ray diffraction. With Ln = La and Ce, several by‐products incorporating lithium, chlorine and/or oxygen were also isolated and structurally characterized.