A mononuclear Fe(III) complex showing thermally induced spin crossover and slow magnetic relaxation with reciprocating thermal behaviour.

AC susceptibility measurements of [Fe(L)(NCSe)] reveal a field supported slow magnetic relaxation. On cooling, the relaxation time of the high-frequency fraction decreases which is a sign of reciprocating thermal behaviour. The relaxation time for the low-frequency mode at = 2.

A heptanuclear {DyCu} complex as a single-molecule magnet.

The structure and magnetic properties of a complex containing a {DyCu} core are presented. In 1, the Dy(III) are 9- and the Cu(II) are 4-, 5- and 6-coordinated. Antiferromagnetic interactions cause an irregular energy spectrum with the ground state = 25/2.

Redox reactions of a pyrazine-bridged Ru(edta) binuclear complex: spectrochemical, spectroelectrochemical and theoretical studies.

The redox reactions of a pyrazine-bridged binuclear [(edta)RupzRu(edta)] (edta = ethylenediaminetetraacetate; pz = pyrazine) have been investigated spectrochemically and spectroelectrochemically for the first time. The kinetics of the reduction of [(edta)RupzRu(edta)] (Ru-Ru) with the ascorbic acid anion (HA) was studied as a function of ascorbic concentration and temperature at a fixed pH 6.0.

Large Magnetic Anisotropy in Mono- and Binuclear cobalt(II) Complexes: The Role of the Distortion of the Coordination Sphere in Validity of the Spin-Hamiltonian Formalism.

To get a better insight into understanding the factors affecting the enhancement of the magnetic anisotropy in single molecule (single ion) magnets, two cobalt(II) complexes based on a tridentate ligand 2,6-di(thiazol-2-yl)pyridine substituted at the 4-position with -methyl-pyrrol-2-yl have been synthesized and studied by X-ray crystallography, AC and DC magnetic data, FIRMS and HFEPR spectra, and theoretical calculations. The change of the counteranion in starting Co(II) salts results in the formation of pentacoordinated mononuclear [Co(mpyr-dtpy)Cl]·2MeCN () complex and binuclear [Co(mpyr-dtpy)][Co(NCS)] () compound. The observed marked distortion of trigonal bipyramid geometry in and cationic octahedral and anionic tetrahedral units in brings up a question about the validity of the spin-Hamiltonian formalism and the possibility of determining the value and sign of the zero-field splitting parameter.

Magnetic properties of a europium(III) complex - possible multiplet crossover.

A dinuclear complex [(HO)Zn(LH)Eu(NO)] containing a hexadentate Schiff-base {NO}-donor ligand LH was prepared and characterized by X-ray structural analysis and IR, electronic and fluorescence spectroscopy. DC magnetic data show that upon heating the diamagnetic complex with the ground state Eu(III)-F and Zn(II)-S switches to paramagnetic species due to the population of F ( = 1 to 6) magnetic multiplets. The magnetic susceptibility increases from zero, passes through a maximum, and then decreases upon heating.