title: Single-molecule magnetism in a pentacoordinate cobalt(II) complex supported by an antenna ligand.
abstract: Pentacoordinate complex [CoL(3)Cl2] with a tridentate antenna-like ligand L(3) forms a dimer held by short π-π stacking with head-to-head contacts at 3.4 Å. The direct-current (dc) magnetic susceptibility and magnetization data confirm weak ferromagnetic interaction and a large-magnetic anisotropy, D/hc = 150 cm(-1) and E/hc = 11.6 cm(-1). The system shows superparamagnetic behavior at low temperature that depends upon the applied magnetic field. At Bdc = 0.2 T, a low-frequency peak at the out-of-phase susceptibility is seen (ν ∼ 0.3 Hz), whereas the onset of the second peak appears at ν > 1500 Hz, indicating the existence of two slow relaxation processes.
authors.affiliation: Department of Chemistry, FPV, University of SS Cyril and Methodius , 917 01 Trnava, Slovakia.
authors.forename: Cyril
authors.initials: C
authors.lastname: Rajnák
authors.forename: Ján
authors.initials: J
authors.lastname: Titiš
authors.forename: Olaf
authors.initials: O
authors.lastname: Fuhr
authors.forename: Mario
authors.initials: M
authors.lastname: Ruben
authors.forename: Roman
authors.initials: R
authors.lastname: Boča