Hexahalorhenate(iv) salts of protonated ciprofloxacin: antibiotic-based single-ion magnets

Abstract

In the crystal lattice of two novel ReIV compounds, the paramagnetic [ReCl6]2− and [ReBr6]2− anions are well separated from each other through two protonated forms of the antibiotic ciprofloxacin. These compounds behave as single-ion magnets (SIMs).

Ferromagnetic Coupling and Single-Ion Magnet Phenomenon in Mononuclear Ruthenium(Iii) Complexes Based on Guanine Nucleobase

“…In the case of compound 1, structural factors and/or a strong quantum tunneling of the magnetization (QTM), would cancel any slow relaxation of the magnetization for this other mononuclear Ru(III) complex. The features observed for 2 are characteristic of compounds displaying slow relaxation of magnetization, what is called Single-Ion Magnet (SIM) behavior when they are mononuclear systems [19,35]. These out-of-phase ac signals obtained at 2500 and 5000 G are given as χ″M versus ν plots in Figure 7.…”

“…The surfaces were drawn considering the distances from a point on the surface to the nearest atom outside (de) and inside (di) their surfaces. Any restriction associated to the size of the involved atoms was corrected through a normalized distance, named dnorm, which was analyzed as previously done [18][19][20]. The Hirshfeld surfaces, along with their fingerprint maps, for complexes 1 and 2 are given in Figures 4 and 5, respectively.…”

Ferromagnetic Coupling and Single-Ion Magnet Phenomenon in Mononuclear Ruthenium(III) Complexes Based on Guanine Nucleobase

“…The surfaces were drawn considering the distances from point on the surface to the nearest atom outside (de) and inside (di) their surfaces. A restriction associated to the size of the involved atoms was corrected through normalized distance, named dnorm, which was analyzed as previously done [18][19][20]. percentage lower than that found in 1, whereas the H-bonding H•••O interactions co pretty much the same value in both compounds, this value being approximately 26.5% the complete fingerprint plot of 2 (Figure 5).…”

“…The surfaces were drawn considering the distances from point on the surface to the nearest atom outside (de) and inside (di) their surfaces. A restriction associated to the size of the involved atoms was corrected throug normalized distance, named dnorm, which was analyzed as previously done [18][19][20]. Hirshfeld surfaces of the neutral [RuCl 4 (Hgua)(dmso)] and [RuCl 4 (Hgua)(gua)] complexes were thus obtained and their intermolecular contacts were studied by means of CrystalExplorer [16,17].…”

Theoretical study of phenylbismuth anion as a blueprint for main-group single-molecule magnets

“…15,16 However, SMMs with only 4d or 5d transition metals are much rarer. 17–20 Despite the stronger SOC compared to the 3d transition metals, the much larger spatial extent of the 4d and 5d orbitals leads to strong crystal-field splitting and metal–ligand covalency. This then leads to stabilization of a low-spin state and quenching of orbital momentum.…”