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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/228418
Comparative Magnetic Studies in the Solid State and Solution of Two Isostructural 1D Coordination Polymers Containing Co<sup>II</sup>/Ni<sup>II</sup>-Curcuminoid Moieties
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Two 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 compoundsweresynthesizedbysolvothermalandmicrowave (MW) assistedtechniques, 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 MT vs. T and M/N B vs. H/T data were collected and fitted for 1 and 2; both systems display Ising plane anisotropy, with significant Dvalues. 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.
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DÍAZ TORRES, Raúl, et al. Comparative Magnetic Studies in the Solid State and Solution of Two Isostructural 1D Coordination Polymers Containing CoII/NiII-Curcuminoid Moieties. Magnetochemistry. 2016. Vol. 2, num. 1-13. ISSN 2312-7481. [consulted: 13 of June of 2026]. Available at: https://hdl.handle.net/2445/228418