title: Supramolecular control over molecular magnetic materials: γ-cyclodextrin-templated grid of cobalt(II) single-ion magnets.
abstract: Single-ion magnets (SIMs) are potential building blocks of novel quantum computing devices. Unique magnetic properties of SIMs require effective separation of magnetic ions and can be tuned by even slight changes in their coordination sphere geometry. We show that an additional level of tailorability in the design of SIMs can be achieved by organizing magnetic ions into supramolecular architectures, resulting in gaining control over magnetic ion packing. Here, γ-cyclodextrin was used to template magnetic Co(II) and nonmagnetic auxiliary Li(+) ions to form a heterometallic {Co, Li, Li}4 ring. In the sandwich-type complex [(γ-CD)2Co4Li8(H2O)12] spatially separated Co(II) ions are prevented from superexchange magnetic coupling. Ac/dc magnetic and EPR studies demonstrated that individual Co(II) ions with positive zero-field splitting exhibit field-induced slow magnetic relaxation consistent with the SIMs' behavior, which is exceptional in complexes with easy-plane magnetic anisotropy.
authors.affiliation: Institute of Physics, Polish Academy of Sciences , al. Lotników 32/46, 02-668 Warsaw, Poland.
authors.forename: Natalia
authors.initials: N
authors.lastname: Nedelko
authors.forename: Arkadiusz
authors.initials: A
authors.lastname: Kornowicz
authors.forename: Iwona
authors.initials: I
authors.lastname: Justyniak
authors.forename: Pavlo
authors.initials: P
authors.lastname: Aleshkevych
authors.forename: Daniel
authors.initials: D
authors.lastname: Prochowicz
authors.forename: Piotr
authors.initials: P
authors.lastname: Krupiński
authors.forename: Orest
authors.initials: O
authors.lastname: Dorosh
authors.forename: Anna
authors.initials: A
authors.lastname: Ślawska-Waniewska
authors.forename: Janusz
authors.initials: J
authors.lastname: Lewiński