Dinuclear Coordination Compounds Based on a 5‑Nitropicolinic Carboxylate Ligand with Single-Molecule Magnet Behavior
journal contributionposted on 21.07.2017, 16:18 authored by Álvaro Raya-Barón, Itziar Oyarzabal, Francisco M. Arrabal-Campos, José Manuel Seco, Antonio Rodríguez-Diéguez, Ignacio Fernández
Isostructural dinuclear dysprosium and yttrium coordination compounds based on the 5-nitropicolinic carboxylate ligand were synthesized and characterized. The formation of these air-stable complexes is achieved via solvothermal routes employing water as the reaction solvent. The dysprosium-based complex exhibits single-molecule magnet behavior with frequency dependence of the out-of-phase susceptibility at zero direct-current field. High-resolution mass spectrometry (electrospray ionization) experiments and advanced NMR methods including diffusion NMR techniques were applied on the diamagnetic yttrium analogue and established that these species retained their solid-state structure in solution with hydrodynamic radii of 6.5 Å. Full 1H, 13C, 15N, 89Y, Δ1Hcoord, Δ13Ccoord, and Δ15Ncoord NMR data are given, and through the analysis of the Ramsey equation, the first electronic insights of these derivatives are provided.
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yttrium coordination compoundsΔ 1 H coord13 C89 YΔ 13 C coord5- nitropicolinic carboxylate liganddiffusion NMR techniquesHigh-resolution mass spectrometryexhibits single-molecule magnet behaviordiamagnetic yttrium analogueDinuclear Coordination Compoundssolvothermal routesNMR methodsRamsey equationΔ 15 N coord NMR dataSingle-Molecule Magnet Behavior Isostructural dinuclear dysprosium1 H6.5 Å.air-stable complexes15 Nelectrospray ionizationdirect-current fieldout-of-phase susceptibilityhydrodynamic radiifrequency dependence