Wydział Chemii

Karol Wydra

Michał J. Kobyłka

Tadeusz Lis

Katarzyna Ślepokura

Jerzy Lisowski

2020

European Journal of Inorganic Chemistry

2096-2104

10.1002/ejic.202000247

Naukowa

Angielski

Artykuł

Depending on the reaction conditions, the enantiopure macrocycle H₃L containing three phenolic units is able to form mono‐ and trinuclear coordination compounds with rare earth metal ions. In these complexes this macrocycle can act as protonated H₄L⁺, neutral H₃L, monodeprotonated H₂L^–, bis‐deprotonated HL^2– or tris‐deprotonated L^3– ligand. X‐ray crystal structure of the Y(III) derivative of the protonated macrocycle shows highly folded conformation of the ligand with N₂O₃ set of donor atoms, while the structure of the Y(III) complex of the monodeprotonated macrocycle shows more regular helically twisted conformation of the ligand. Under basic conditions trinuclear complexes of the type [M₃L(OH)₂] are formed with most of rare earth ions, where the macrocycle acts as N₆O₃ ligand. This type of complex is not formed for the La(III) and Ce(III) ions of the largest radii within the lanthanide(III) series, instead trinuclear complexes of the type [M₃L₂] are formed. The X‐ray crystal structures of La(III) complex with fully deprotonated or bis‐deprotonated macrocycles indicate that each macrocyclic unit binds only two metal ions, while one of them is shared by two macrocycles.

Rare earths, Macrocycles, Chiral ligands, Coordination chemistry, Structure elucidation

http://dx.doi.org/10.1002/ejic.202000247

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