A new series of lanthanide complexes with the trans-disubstituted Py2[18]aneN6 macrocyclic ligand: synthesis, structures and properties
| Autor: | Laura Valencia, Rodrigo Lamelas, Elena Labisbal, José M. Vila, Rufina Bastida, Paulo Pérez-Lourido, Alejandro Macías, Cristina Núñez, Teresa Pereira |
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| Rok vydání: | 2019 |
| Předmět: |
Lanthanide
Aqueous solution 010405 organic chemistry Ligand Metal ions in aqueous solution Ethylenediamine 010402 general chemistry 01 natural sciences 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound Crystallography chemistry Materials Chemistry Chelation Macrocyclic ligand Physical and Theoretical Chemistry Single crystal |
| Zdroj: | Polyhedron. 160:180-188 |
| ISSN: | 0277-5387 |
| DOI: | 10.1016/j.poly.2018.12.006 |
| Popis: | New lanthanide complexes with the trans-disubstituted macrocyclic ligand Py2[18]aneN6 (denoted as L1) were successfully synthesized. The coordination properties of compound L1 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: [H4L1](NO3)4, [CeL1(NO3)2](NO3) and [SmL1(NO3)2](NO3) have been characterized by single crystal X-ray diffraction. In both complexes, the asymmetric unit contains the cation complex [LnL1(NO3)2]+ (Ln = Ce3+, Sm3+) 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 C2 symmetry (as observed in solution by NMR). |
| Databáze: | OpenAIRE |
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