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Structural versatility of 3d-Ce-III heterometallic coordination polymers using Co-II or Cu-II

By Carlos Moraga Cruz, Evgenia Spodine Spiridonova, Nathalie Audebrand, Diego Venegas Yazigi and Verónica Paredes García

Abstract

In the present work, we report the synthesis and characterization of two new heterometallic coordination polymers based on Ce-III and containing Co-II or Cu-II cations, assembled by the bifunctional ligand 1H-imidazole-4,5-dicarboxylic acid, [Ce(H2O)(2)(HIDC)Co(IDC)]center dot H2O CoCe and [Ce(H2O)(2)(H2IDC)Cu(H2O)(IDC)Cu-0.2(H1.6IDC)] CuCe. Compound CoCe was obtained under one pot hydrothermal synthesis, while CuCe was synthesized by a step-by-step synthesis using the metalloligand [Cu(H2IDC)(2)-(H2O)(2)] Cu1, as precursor. From a structural point of view, CoCe presents an intrincated 3D structure, in which alternating Lambda-Delta chiral Co-II chains can be observed, which are assembled by discrete Ce-III fragments, giving rise to the 3D structure. Meanwhile, CuCe presents a structure formed by [Cu2Ce2] heterometallic chains, partially assembled by Cu-II cations in a 2D structure. Magnetic properties reveal that both CoCe and CuCe present a global antiferromagnetic behavior, dominated by the interaction between Co-II-Co-II or Cu-II-Cu-II entities connected by mu(2)-kappa N,O-kappa O"',N' bridges, belonging to H3IDC anionic derivatives. Moreover, a weak ferromagnetic phenomenon was found in compound CoCe, corroborated by hysteresis loops and ac magnetization

Topics: Chemistry (all), Materials science (all), Condensed matter physics
Publisher: 'American Chemical Society (ACS)'
Year: 2018
DOI identifier: 10.1021/acs.cgd.8b00590
OAI identifier: oai:repositorio.uchile.cl:2250/158429
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