Mononuclear and binuclear lanthanide acetates with chelating and bridging triethanolamine ligands. (1st November 2018)

• Record Type: Journal Article
• Authors: Koroteev, Pavel S.; Ilyukhin, Andrey B.; Efimov, Nikolay N.; Belova, Ekaterina V.; Gavrikov, Andrey V.; Novotortsev, Vladimir M.
• Is Part Of: Polyhedron. Volume 154(2018)
• Page Start: 54
• Page End: 64
• Publication Date: 2018-11-01
• Subjects: Lanthanide acetate -- Triethanolamine -- Heteroleptic complex -- Thermolysis study -- Magnetostructural correlation; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2018.07.027
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Two mono- and four binuclear heteroleptic lanthanide complexes containing acetate and triethanolamine ligands were characterized by X-ray. Thermolysis of the complexes was studied. Magnetic properties of Gd complex along with the published data allowed to verify the earlier found magnetostructural correlation for Gd2 O2 complexes. Dy complex displays slow magnetic relaxation. Abstract: The interaction of lanthanide acetates with triethanolamine in pyridine medium yields mononuclear cationic complexes [Ln(teaH3 )2 (MeCOO)](MeCOO)2 ·0.5Py (teaH3 = N(CH2 CH2 OH)3, Py – pyridine) in cases Ln = Ce (1 ) and Pr (2 ), and binuclear heteroleptic complexes containing deprotonated triethanolamine [Ln2 (MeCOO)4 (teaH2 )2 ] (Ln = Gd (3 ), Dy (4 ), Ho (5 ), and Er (6 )). In the complexes of the first type, tetradentate chelating triethanolamine is a neutral ligand, while the metal core of the complexes of the second type is formed of lanthanide ions and bridging oxygen atoms of deprotonated teaH3 . In the processes of thermal decomposition of complexes, systematic changes related to the character of the Ln 3+ ions are noted. The complexes1 –6 were characterized by dc magnetic measurements, the Dy, Ho, and Er derivatives were also investigated in ac field. In the Gd complex, antiferromagnetic interactions between the Gd 3+ ions were found. Results for complex3, along with the literature data for eight complexes with the [Gd2 O2 ] core, allowed to complement and to confirm the correlation between the value of the exchange interaction energy J Gd–Gd′ and the interionic distances D Gd…Gd′ for the complexes of this type that we found earlier. Complex of Dy exhibits field-induced slow relaxation of the magnetization.