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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Kaczmarek, Małgorzata Teresa
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Topics
Publications (5/5 displayed)
- 2018Coordination properties of N,N′-bis(5-methylsalicylidene)-2-hydroxy-1,3-propanediamine with d- and f-electron ions: crystal structure, stability in solution, spectroscopic and spectroelectrochemical studiescitations
- 2018Carboxyl groups of citric acid in the process of complex formation with bivalent and trivalent metal ions in biological systemscitations
- 2015Two types of lanthanide Schiff base complexes: Synthesis, structure and spectroscopic studiescitations
- 2015Supramolecular polymer of Schiff base gadolinium complex: Synthesis, crystal structure and spectroscopic propertiescitations
- 2013Potentiometric Study of Lanthanide Salicylaldimine Schiff Base Complexescitations
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article
Two types of lanthanide Schiff base complexes: Synthesis, structure and spectroscopic studies
Abstract
<p>Graphical abstract Two types of lanthanide salen complexes have been obtain. The general formulae of the complexes are [Ln(H<sub>2</sub>L)<sub>3</sub>(NO<sub>3</sub>)<sub>3</sub>] Ln = La, Eu, Tb - type I and [Ln(H<sub>2</sub>L)<sub>2</sub>(NO<sub>3</sub>)<sub>3</sub>EtOH]MeOH Ln = Er, Tm - type II, where H<sub>2</sub>L is N,N′-bis(5-methylsalicylidene)-4-methyl-1,3-phenylenediamine. The structural change is due to a decrease of the ionic radii of the lanthanide ions. A series of five Ln(III) salen type complexes, with La(III), Eu(III), Tb(III), Er(III) and Tm(III) cations, were obtained by a template reaction between 5-methylsalicylaldehyde and 4-methyl-1,3-phenylenediamine in the presence of the appropriate Ln(III) nitrate. Two types of complexes of the general formulae [Ln(H<sub>2</sub>L)<sub>3</sub>(NO<sub>3</sub>)<sub>3</sub>] (type I) [Ln = La (1), Eu (2), Tb (3)] and [Ln(H<sub>2</sub>L)<sub>2</sub>(NO<sub>3</sub>)<sub>3</sub>EtOH]MeOH (type II) [Ln = Er (4), Tm (5)], where H<sub>2</sub>L is N,N′-bis(5-methylsalicylidene)-4-methyl-1,3-phenylenediamine, were characterized by elemental analysis, FT-IR, ESI-MS, TG-DTA analysis, UV-Vis luminescence and <sup>1</sup>H and <sup>13</sup>C NMR spectroscopy. Single-crystal X-ray diffraction revealed that the type I complexes crystallize in the monoclinic P2<sub>1</sub>/n space group, while type II complexes crystallize in the monoclinic Cc space group. The central cations for both type of complexes are nine-coordinated, exclusively by oxygen atoms, and the coordination resembles a distorted tricapped trigonal prism. In the case of type 1 complexes, the central cations are coordinated with three nitrate groups and three H<sub>2</sub>L neutral molecules, while for type 2 complexes, one of the ligand molecule is replaced by an ethanol molecule. In the latter case, the methanol molecule plays an important role in the crystal packing, taking part in hydrogen bonding which connects the complex molecules into infinite chains. The structural change is due to a decrease of the ionic radii of the lanthanide ions.</p>