Interaction of neutral and anionic o-donor organic ligands with europium(III) in the macrocyclic complex [Eu(CH3COO)2(C22H26N6)]Cl · 4H2O and crystal structure of [Eu(CH3COO)2(C22H26N6)](CH3COO) · 9H2O

Covalent lanthanide(iii) macrocyclic complexes: the bonding nature and optical properties of a promising single antenna molecule

The present work is focused on the elucidation of the electronic structure, bonding and optical properties of a series of coordination compounds of type [Ln^IIIHAM]³⁺, where “Ln^III” are the trivalent lanthanide ions: La³⁺, Ce³⁺, Eu³⁺ and Lu³⁺, while “HAM” is the neutral six-nitrogen macrocyclic ligand [C₂₂N₆H₂₆].

Interactions of Trivalent Lanthanide Cations with a New Hexadentate Di-Schiff Base: New Lanthanide(III) Complexes from (NE,N'E)-2,2'-(ethane-1,2-diylbis(oxy))bis(N-(pyridin-2-ylmethylene)ethanamine)

The novel lanthanide(III) complexes [Ln(NO(3))(2)L](NO(3)).3MeOH (Ln = La 1, Pr 2) and [Ln(NO(3))(3)L](NO(3)).2MeOH (Ln = Gd 3, Yb 4), where L = (NE,N'E)-2,2'-(ethane-1,2-diylbis(oxy))bis(N-(pyridin-2-ylmethylene)ethanamine), have been obtained by direct reaction of the Schiff base ligand and the corresponding hydrated lanthanide(III) nitrates in methanol. All complexes were characterized spectroscopically and thermogravimetrically. Complex 4 was also characterized with crystallographic studies: orthorhombic P2(1)2(1)2(1), a = 10.6683(14), b = 13.4752(15), c = 19.3320(26) A. In the molecular structure of 4, Yb(III) is surrounded by all donor atoms of the Schiff base (four nitrogen and two oxygen atoms) and four oxygen atoms belonging to two bidentate chelating nitrato ligands.