Spin Cross-Over (SCO) Complex Based on Unsymmetrical Functionalized Triazacyclononane Ligand: Structural Characterization and Magnetic Properties
| Autor: | Said Yefsah, Smail Triki, Carlos J. Gómez-García, Véronique Patinec, Merzouk Halit, Mélissa Roger |
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| Přispěvatelé: | Chimie, Electrochimie Moléculaires et Chimie Analytique (CEMCA), Institut Brestois Santé Agro Matière (IBSAM), Université de Brest (UBO)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Université Mouloud Mammeri [Tizi Ouzou] (UMMTO), Instituto de Ciencia Molecular (ICMol), Universitat de València (UV) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Crystal structure
010402 general chemistry Ring (chemistry) 01 natural sciences lcsh:Chemistry chemistry.chemical_compound Spin crossover Pyridine Magnetic properties Macrocycle ligands Iron complex High spin and Low spin Spin Cross-Over Materials Chemistry Molecule [CHIM.COOR]Chemical Sciences/Coordination chemistry 010405 organic chemistry Ligand [CHIM.MATE]Chemical Sciences/Material chemistry Nuclear magnetic resonance spectroscopy 0104 chemical sciences Electronic Optical and Magnetic Materials Crystallography Monomer chemistry lcsh:QD1-999 Chemistry (miscellaneous) |
| Zdroj: | Magnetochemistry, Vol 5, Iss 1, p 19 (2019) Magnetochemistry Magnetochemistry, MDPI, 2019, 5 (1), pp.19. ⟨10.3390/magnetochemistry5010019⟩ Magnetochemistry; Volume 5; Issue 1; Pages: 19 |
| ISSN: | 2312-7481 |
| DOI: | 10.3390/magnetochemistry5010019⟩ |
| Popis: | International audience; The unsymmetrical ligand 1-(2-aminophenyl)-4,7-bis(pyridin-2-ylmethyl)-1,4,7-triazacyclononane (L6) has been prepared and characterized by NMR spectroscopy. The L6 ligand is based on the triazamacrocycle (tacn) ring that is functionalized by two flexible 2-pyridylmethyl and one rigid 2-aminophenyl groups. Reaction of this ligand with Fe(ClO4)2·xH2O led to the complex [Fe(L6)](ClO4)2 (1), which was characterized as the first Fe(II) complex based on the unsymmetrical N-functionalized tacn ligand. The crystal structure revealed a discrete monomeric [FeL6]2+ entity in which the unsymmetrical N-functionalized triazacyclononane molecule (L6) acts as hexadentate ligand. As observed in the few parent examples that are based on the symmetrical N-functionalized tacn ligands, the triazacyclononane ring is facially coordinated and the N-donor atoms of the three functional groups (two pyridine and one aniline groups) are disposed in the same side of the tacn ring, leading to a distorted FeN6 environment. The magnetic studies of 1 revealed the presence of an incomplete spin crossover (SCO) transition above 425 K, whose progress would be prevented by a very exothermic thermal decomposition at ca. 472 K, as shown by thermogravimetric and DSC measurements |
| Databáze: | OpenAIRE |
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