posted on 2017-07-21, 16:18authored byÁlvaro 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.