Raya-Barón Álvaro, Oyarzabal Itziar, Arrabal-Campos Francisco M, Seco José Manuel, Rodríguez-Diéguez Antonio, Fernández Ignacio
Department of Chemistry and Physics, University of Almería , Ctra. Sacramento s/n, 04120 Almería, Spain.
Department of Applied Chemistry, University of The Basque Country (UPV/EHU) , 20018 San Sebastián, Spain.
Inorg Chem. 2017 Aug 7;56(15):8768-8775. doi: 10.1021/acs.inorgchem.7b00388. Epub 2017 Jul 21.
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 H, C, N, Y, ΔH, ΔC, and ΔN NMR data are given, and through the analysis of the Ramsey equation, the first electronic insights of these derivatives are provided.
合成并表征了基于5-硝基吡啶羧酸配体的同构双核镝和钇配位化合物。这些空气稳定配合物的形成是通过以水为反应溶剂的溶剂热路线实现的。基于镝的配合物表现出单分子磁行为，在零直流场下，其异相磁化率具有频率依赖性。对抗磁性钇类似物进行了高分辨率质谱（电喷雾电离）实验和包括扩散核磁共振技术在内的先进核磁共振方法，确定这些物种在溶液中保留了其固态结构，流体动力学半径为6.5 Å。给出了完整的H、C、N、Y、ΔH、ΔC和ΔN核磁共振数据，并通过对拉姆齐方程的分析，提供了这些衍生物的首个电子见解。
