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Versatile Binding Modes of Chiral Macrocyclic Amine towards Rare Earth Ions
Author(s) -
Wydra Karol,
Kobyłka Michał J.,
Lis Tadeusz,
Ślepokura Katarzyna,
Lisowski Jerzy
Publication year - 2020
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202000247
Subject(s) - deprotonation , chemistry , protonation , ligand (biochemistry) , lanthanide , stereochemistry , crystallography , enantiopure drug , crystal structure , amine gas treating , metal , metal ions in aqueous solution , macrocyclic ligand , ion , enantioselective synthesis , catalysis , organic chemistry , biochemistry , receptor
Depending on the reaction conditions, the enantiopure macrocycle H 3 L 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 H 4 L + , neutral H 3 L, monodeprotonated H 2 L – , 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 N 2 O 3 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 [M 3 L(OH) 2 ] are formed with most of rare earth ions, where the macrocycle acts as N 6 O 3 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 [M 3 L 2 ] 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.