Building-up host–guest helicate motifs and chains: a magneto-structural study of new field-induced cobalt-based single-ion magnets
Nathália R. de Campos, Cintia A. Simosono, Iara M. L. Rosa, Rafaela M. R. da Silva, A.C. Doriguetto, Walace D. do Pim, Tatiana R. G. Simões, Ana Karoline Silva Mendanha Valdo, Felipe Terra Martins, Charlie V. Sarmiento, Wallace C. Nunes, Guilherme P. Guedes, Emerson F. Pedroso, Cynthia L. M. Pereira, Humberto O. Stumpf, Francesc Lloret, Miguel Julve, Maria Vanda Marinho
Abstract
in 1 : 2 molar ratio at room temperature. Magnetic measurements of Pre-I revealed a quasi magnetically isolated S = 3/2 spin state with a significant second-order spin-orbit contribution as expected for tetrahedrally coordinated cobalt(ii) ions. The analysis of the variable temperature static (dc) magnetic susceptibility data through first- (1 and 3) and second-order spin-orbit coupling models (2 and 4) reveals the presence of magnetically non-interacting high-spin cobalt(ii) ions with easy-axis (1 and 4)/easy-plane magnetic anisotropies (2 and 4) with low rhombic distortions. Dynamic (ac) magnetic measurements for Pre-I and 1-4 below 8.0 K show that they are examples of field-induced Single-Ion Magnets (SIMs).