A new series of lanthanide-based complexes with a bis(hydroxy)benzoxaborolone ligand Synthesis, crystal structure, and magnetic and optical properties
Résumé
Reactions, under hydrothermal conditions, between lanthanide chlorides and the sodium salt of 2-carboxyphenylboronic acid lead to a series of lanthanide-based complexes with general chemical formula [Ln2(C7H5O2)4(C7O4H6B)2·4H2O] with Ln = Eu–Dy. During the synthetic process, the 2-carboxyphenylboronate ligand decomposes leading to benzoate (C7H5O2) and bis(hydroxy)benzoxaborolone (C7O2H6B). The crystal structure was solved on the basis of the Tb-derivative. It crystalizes in the triclinic system, space group P[1 with combining macron] (n° 2) with a = 9.3329(13) Å, b = 16.012(2) Å, c = 16.212(2) Å, α = 107.789(5)°, β = 90.226(5)°, γ = 97.585(5)°, V = 2284.16(52) Å3 and Z = 2. Its crystal structure can be described on the basis of di-lanthanides entities surrounded by ligands. Compounds that constitute this series are thermally stable up to 190 °C. Solid-state luminescence properties have been studied in detail. The magnetic properties of the Dy-derivative have also been explored. It exhibits single molecule magnet behavior. Single crystals of the sodium salt of 2-carboxyphenylboronic acid with chemical formula [Na(C7O4H6B)(H2O)]∞ have also been obtained during this study. This compound crystallizes in the orthorhombic system, space group P212121 (n° 19) with a = 4.5881(13) Å, b = 6.5905(16) Å, c = 29.644(8) Å, V = 897.0(4) Å3 and Z = 4. Its crystal structure is 2D and can be described as zigzag chains of sodium 2-carboxyphenylboronate bound to each other by coordination water molecules.
Mots clés
Luminescence
Molecules
Orthorhombic systems
Dysprosium compounds
Ligands
Optical properties
Rare earth elements
Sodium
Salts
Chlorine compounds
Chelation
Chemical formulae
Hydrothermal conditions
Luminescence properties
Magnetic and optical properties
Synthesis (chemical)
Terbium compounds
Synthetic process
Triclinic systems
Single-molecule magnet
Crystal structure
Fichier principal
Abdallah et al-2020-A new series of lanthanide-based complexes with a bis(hydroxy)benzoxaborolone ligand-manuscript_revised-1.pdf (2.34 Mo)
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