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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 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.The authors thank N. Clos from the Serveis Científicotècnics de la UB for her great assistance\udregarding the magnetic data and are grateful to O. Roubeau (ICMA, CSIC and Universidad de Zaragoza) for his\udhelp in the data acquisition and refinement of the structure of compound 1. This work was supported by the\udMINECO (Spain) (Projects CTQ2012-32247, and MAT2013-47869-C4-2-P) and from the FONDECYT REGULAR\udgrant 1110206. N.A.-A. acknowledges support of the Spanish MINECO through the Severo Ochoa Centers\udof Excellence Program under Grant SEV-2015-0496. The Advanced Light Source (S.J.T.) is supported by the\udDirector, Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy under Contract\udDE-AC0205CH11231.Peer reviewe

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