Different supramolecular architectures in self-assembled praseodymium(III) and europium(III) complexes with rare coordination pattern of salicylaldimine ligand

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• 作者：Izabela Pospieszna-Markiewicz^a ; ^{izap@amu.edu.pl" class="auth_mail" title="E-mail the corresponding author} ; Wanda Radecka-Paryzek^a ; Maciej Kubicki^a ; Maria Korabik^b ; Zbigniew Hnatejko^a
• 关键词：Lanthanides ; Self-assembly ; Schiff base complexes ; Dimer ; 2-D polymer
• 刊名：Polyhedron
• 出版年：2015
• 出版时间：5 September 2015
• 年：2015
• 卷：97
• 期：Complete
• 页码：167-174
• 全文大小：1825 K

文摘

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(渭-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(渭-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.