Tri- (M = Cu II ) and hexanuclear (M = Ni II , Co II ) heterometallic coordination compounds with ferrocene monocarboxylate ligands: Solid-state structures and thermogravimetric, electrochemical and magnetic properties

High-frequency EPR study on Cu4Cu- and Co4Co-metallacrown complexes

“…[1] it is argued that anisotropy of Co 4 Co is larger than D = −64 cm −1 . Similarly large values are found in the literature for isolated high-spin Co(II) complexes in distorted octahedral coordination where, e.g., g = 2.580, |D| = 87.9 cm −1 [10], |D| = 60(3) cm −1 , g z = 2.77(5), g xy = 3.04(5) [11], and [12]. In order to assess the energy level diagram we used a phenomomenological Hamiltonian consisting of a Zeeman and a zero field splitting term, which is given by…”

“…This is in good accordance to reported Co(II)-ions in distorted octahedral environment. [10,11,12] It also agrees to the χT -curve that obeys the characteristic behavior of an isolated six-coordinate Co(II) ion. From the high-temperature value of χT the effective g-factor of 2.60 had been concluded previously [1] which reasonably matches to the more precise g-value derived from the EPR study at hand.…”