Crystal structures of binuclear complexes of gadolinium(III) and dysprosium(III) with oxalate bridges and chelating N,N′-bis(2-oxidobenzyl)-N,N′-bis(pyridin-2-ylmethyl)ethylenediamine (bbpen2−)
| Autor: | Francielli S. Santana, Giovana G. Nunes, Jaísa F. Soares, Guilherme A. Barbosa |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Lanthanide
crystal structure lanthanide Dimer Gadolinium N N′-bis(2-hydroxybenzyl)-N N′-bis(pyridin-2-ylmethyl)ethylenediamine chemistry.chemical_element Crystal structure Triclinic crystal system 010402 general chemistry 010403 inorganic & nuclear chemistry 01 natural sciences Medicinal chemistry Oxalate chemistry.chemical_compound General Materials Science Isostructural Crystallography General Chemistry Condensed Matter Physics binuclear oxalate bridge 0104 chemical sciences chemistry QD901-999 Amine gas treating H2bbpen |
| Zdroj: | Acta Crystallographica Section E: Crystallographic Communications, Vol 75, Iss 4, Pp 418-422 (2019) |
| ISSN: | 2056-9890 |
| DOI: | 10.1107/s2056989019002998 |
| Popis: | The reaction between mononuclear [Ln(bbpen)Cl] [Ln = Gd or Dy; H2bbpen = N,N′-bis(2-hydroxybenzyl)-N,N′-bis(pyridin-2-ylmethyl)ethylenediamine, C28H30N4O2] and potassium oxalate monohydrate in water/methanol produced the solvated centrosymmetric isostructural binuclear (μ-oxalato)bis{[N,N′-bis(2-oxidobenzyl-κO)-N,N′-bis(pyridin-2-ylmethyl-κN)ethylenediamine-κ2 N,N′]dilanthanide(III)}–methanol–water (1/4/4) complexes, [Ln 2(C28H28N4O2)2(C2O4)]·4CH3OH·4H2O, with lanthanide(III) = gadolinium(III) (Ln = Gd) and dysprosium(III) (Ln = Dy), in high yields (ca 70%) directly from the reaction mixtures. In both complexes, the lanthanide ion is eight-coordinate and adopts a distorted square-antiprismatic coordination environment. The triclinic (P\overline{1}) unit cell contains one dimeric unit together with four water and four methanol molecules; in the final structural model, two of each type of solvating molecule refine well. In each lanthanide(III) dimeric molecule, the medium-strength O...H—O hydrogen-bonding pattern involves four oxygen atoms, two of them from the phenolate groups that are `bridged' by one water and one methanol molecule. These interactions seem to contribute to the stabilization of the relatively compact shape of the dimer. Electron densities associated with an additional water and methanol molecule were removed with the SQUEEZE procedure in PLATON [Spek (2015). Acta Cryst. C71, 9–18]. These two new compounds are of interest with respect to magnetic properties. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|