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Comparative Magnetic Studies in the Solid State and Solution of Two Isostructural 1D Coordination Polymers Containing CoII/NiII-Curcuminoid Moieties

AutorDiaz Torres, Raul ; Menelaou, Melita; González Campo, Arántzazu ; Teat, Simon J.; Sañudo, E. Carolina; Soler Jaumá, Mónica; Aliaga Alcalde, Nuria
Palabras claveCurcumin derivatives
Building block
1D coordination chain
Slow relaxation of magnetization
Paramagnetic NMR
HOPG surface
Fecha de publicaciónsep-2016
EditorMultidisciplinary Digital Publishing Institute
CitaciónMagnetochemistry 2(3): 29 (2016)
ResumenTwo novel 1D coordination chains containing the curcuminoid (CCMoid) ligand 9Accm have been characterized: [CoII(9Accm)2(4,4´-bpy)]n (1) and [NiII(9Accm)2(4,4´-bpy)]n (2). The two compounds were synthesized by solvothermal and microwave (MW) assisted techniques, respectively, and crystals of both systems were directly obtained from the mother solutions. Crystal structures of 1 and 2 prove that both systems are isostructural, with the ligands in a trans configuration. The two chains have been magnetically characterized in solution by paramagnetic 1H NMR, where 1 displayed typical features from CoII systems, with spread out signals; meanwhile, 2 showed diamagnetic behaviour. The dissociation of the latest in solution and the stability of the “[Ni(9Accm)2]” unit were proved by further experiments in C5D5N. Additional UV-Vis absorption and fluorescence studies in solution were performed using exclusively 1. In the solid state χMT vs. T and M/NµB vs. H/T data were collected and fitted for 1 and 2; both systems display Ising plane anisotropy, with significant D values. System 1 presented slow relaxation of the magnetization, displaying frequency dependence in the in-phase/out-phase ac magnetic susceptibility data, when an external dc field of 0.2 T was applied. Finally, 1 was deposited on a HOPG (highly oriented pyrolytic graphite) substrate by spin-coating and analysed by AFM.
Versión del editorhttp://dx.doi.org/10.3390/magnetochemistry2030029
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