Wydział Chemii

Izabela Pospieszna-Markiewicz

Wanda Radecka-Paryzek

Maciej Kubicki

Maria Korabik

Zbigniew Hnatejko

2015

Polyhedron

97

167-174

10.1016/j.poly.2015.05.022

Naukowa

Angielski

Artykuł

The metal-promoted one-step reaction of 5-methylsalicylaldehyde with 1,3-phenylenediamine in the presence of europium(III) or praseodymium(III) ions produces salicylaldimine complexes containing the N,N′-bis(5-methylsalicylidene)-1,3-phenylenediamine ligand (C₂₂H₂₀N₂O₂ = H₂L) as a result of the [2 + 1] Schiff base condensation. The compounds were characterized by spectroscopic data (ESI-MS, IR, ¹H NMR, UV–Vis, luminescence), magnetic measurements, thermogravimetric analysis and X-ray crystallography. The crystal structures of the complexes reveal two different supramolecular architectures: a finite dimer in {[Eu₂(μ-C₂₂H₂₀N₂O₂)₂(C₂₂H₂₀N₂O₂)₂(NO₃)₆]·2CH₃CN} complex with a nine-coordinate distorted tricapped trigonal antiprism geometry and an infinite two-dimensional polymer in {[Pr₂(μ-C₂₂H₂₀N₂O₂)₄(NO₃)₆]_∞·4CH₃CN} complex with ten-coordinate distorted bicapped dodecahedron geometry. The rare cooordinated pattern of salicylaldimine is observed in these complexes in which the potentially tetradentate N₂O₂ Schiff base acts as undeprotonated monodentate and/or bridging ligands that use exclusively the oxygens as donor atoms with the nitrogen atoms not being involved in coordination.

lanthanides, Self-assembly, Schiff base complexes, Dimer, 2-D polymer

http://dx.doi.org/10.1016/j.poly.2015.05.022

http://www.elsevier.com