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Radecka-Paryzek, Wanda
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article
Different supramolecular architectures in self-assembled praseodymium(III) and europium(III) complexes with rare coordination pattern of salicylaldimine ligand
Abstract
<p>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 (C<sub>22</sub>H<sub>20</sub>N<sub>2</sub>O<sub>2</sub> = H<sub>2</sub>L) as a result of the [2 + 1] Schiff base condensation. The compounds were characterized by spectroscopic data (ESI-MS, IR, <sup>1</sup>H 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 {[Eu<sub>2</sub>(μ-C<sub>22</sub>H<sub>20</sub>N<sub>2</sub>O<sub>2</sub>)<sub>2</sub>(C<sub>22</sub>H<sub>20</sub>N<sub>2</sub>O<sub>2</sub>)<sub>2</sub>(NO<sub>3</sub>)<sub>6</sub>]·2CH<sub>3</sub>CN} complex with a nine-coordinate distorted tricapped trigonal antiprism geometry and an infinite two-dimensional polymer in {[Pr<sub>2</sub>(μ-C<sub>22</sub>H<sub>20</sub>N<sub>2</sub>O<sub>2</sub>)<sub>4</sub>(NO<sub>3</sub>)<sub>6</sub>]<sub>∞</sub>·4CH<sub>3</sub>CN} complex with ten-coordinate distorted bicapped dodecahedron geometry. The rare cooordinated pattern of salicylaldimine is observed in these complexes in which the potentially tetradentate N<sub>2</sub>O<sub>2</sub> 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.</p>