2026-04-13T15:12:06Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2284182026-04-07T19:13:07Zcom_2072_1057col_2072_478917col_2072_478933

00925njm 22002777a 4500 dc Díaz Torres, Raúl author Menelaou, Melita author González-Campo, Arántzazu author Teat, Simon J. author Sañudo Zotes, Eva Carolina author Soler, Mònica author Aliaga-Alcalde, Núria author 2026-03-23T13:39:57Z 2026-03-23T13:39:57Z 2016-09-01 2026-03-23T13:39:58Z 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. Comparative Magnetic Studies in the Solid State and Solution of Two Isostructural 1D Coordination Polymers Containing Co^II/Ni^II-Curcuminoid Moieties