A new series of lanthanide complexes with the trans-disubstituted Py2[18]aneN6 macrocyclic ligand: synthesis, structures and properties. (1st March 2019)

• Record Type: Journal Article
• Authors: Lamelas, Rodrigo; Bastida, Rufina; Labisbal, Elena; Macías, Alejandro; Pereira, Teresa; Pérez-Lourido, Paulo; Valencia, Laura; Vila, José M.; Núñez, Cristina
• Is Part Of: Polyhedron. Volume 160(2019)
• Page Start: 180
• Page End: 188
• Publication Date: 2019-03-01
• Subjects: trans-Disubstitution -- Lanthanide complexes -- N-Alkylated hexaaza-macrocycle -- X-ray diffraction -- NMR; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2018.12.006
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: The coordination properties of a novel trans -disubstituted macrocyclic ligand Py2 [18]aneN6 (denoted asL 1 ) towards different lanthanide metal ions (Ln = La–Yb, except Lu) were explored, and structural studies have been carried out both in the solid state and in aqueous solution. The crystalline structures of the following compounds: [H4 L 1 ](NO3 )4, [CeL 1 (NO3 )2 ](NO3 ) and [SmL 1 (NO3 )2 ](NO3 ) have been characterized by single crystal X-ray diffraction. Abstract: New lanthanide complexes with the trans -disubstituted macrocyclic ligand Py2 [18]aneN6 (denoted asL 1 ) were successfully synthesized. The coordination properties of compoundL 1 towards different lanthanide metal ions (Ln = La–Yb, except Lu) were explored, and structural studies have been carried out both in the solid state and in aqueous solution. In all cases, complexes with a 1:1 metal:ligand molar ratio were obtained. The crystalline structures of the following compounds: [H4 L 1 ](NO3 )4, [CeL 1 (NO3 )2 ](NO3 ) and [SmL 1 (NO3 )2 ](NO3 ) have been characterized by single crystal X-ray diffraction. In both complexes, the asymmetric unit contains the cation complex [LnL 1 (NO3 )2 ] + (Ln = Ce 3+, Sm 3+ ) which consist of a mononuclear endomacrocyclic backbone whilst the ten coordination environment is completed by two bidentade nitrate ions. The two five membered chelate rings formed by the ethylenediamine moieties adopt (δδ) [or (λλ)] conformations and also presented a C 2 symmetry (as observed in solution by NMR).