[M(Hdapsc)]-[Cr(CN)] (M = Mn, Co) Chain and Trimer Complexes: Synthesis, Crystal Structure, Non-Covalent Interactions and Magnetic Properties.

Four new heterometallic complexes combining [M(Hdapsc)] cations with the chelating Hdapsc {2,6-diacetylpyridine-bis(semicarbazone)} Schiff base ligand and [Cr(CN)] anion were synthesized: {[M(Hdapsc)]Cr(CN)K(HO)(EtOH)}·1.2(HO), M = Mn () and Co (), {[Mn(Hdapsc)]Cr(CN)(HO)}Cl·HO () and {[Co(Hdapsc)]Cr(CN)(HO)}Cl·2EtOH·3HO (). In all the compounds, M(II) centers are seven-coordinated by NO atoms of Hdapsc in the equatorial plane and N or O atoms of two apical -CN/water ligands.

Performance Validation of a Planar Hall Resistance Biosensor through Beta-Amyloid Biomarker.

Magnetic sensors have great potential for biomedical applications, particularly, detection of magnetically-labeled biomolecules and cells. On the basis of the advantage of the planar Hall effect sensor, which consists of improved thermal stability as compared with other magnetic sensors, we have designed a portable biosensor platform that can detect magnetic labels without applying any external magnetic field. The trilayer sensor, with a composition of Ta (5 nm)/NiFe (10 nm)/Cu ( = 0 nm~1.

Slow Magnetic Relaxation, Antiferromagnetic Ordering, and Metamagnetism in Mn (H dapsc)-Fe (CN) Chain Complex with Highly Anisotropic Fe-CN-Mn Spin Coupling.

Reactions of [Mn(H dapsc)Cl ]⋅H O (dapsc=2,6- diacetylpyridine bis(semicarbazone)) with K [Fe(CN) ] and (PPh ) [Fe(CN) ] lead to the formation of the chain polymeric complex {[Mn(H dapsc)][Fe(CN) ][K(H O) ]} ⋅1.5n H O (1) and the discrete pentanuclear complex {[Mn(H dapsc)] [Fe(CN) ] (H O) }⋅4 CH OH⋅3.4 H O (2), respectively.

Evidence of field induced slow magnetic relaxation in cis-[Co(hfac)(HO)] exhibiting tri-axial anisotropy with a negative axial component.

We report a combined experimental characterization and theoretical modeling of the hexa-coordinated high-spin Co(ii) complex cis-[Co(hfac)(HO)] (I). The magnetic static field (DC) data and EPR spectra (measurements were carried out on the powder samples of diluted samples cis-[CoZn (hfac)(HO)]) were analyzed with the aid of the parametric Griffith Hamiltonian for the high-spin Co(ii) supported by the ab initio calculations of the crystal field (CF) parameters, g-factors and superexchange parameters between H-bonded Co(ii) ions in the neighboring molecules in a 1D network. This analysis suggests the presence of the easy axis of magnetic anisotropy and also shows the existence of a significant rhombic component.

Single-Ion Magnet EtN[Co(hfac)] with Nonuniaxial Anisotropy: Synthesis, Experimental Characterization, and Theoretical Modeling.

In this article we report the synthesis and structure of the new Co(II) complex EtN[Co(hfac)] (I) (hfac = hexafluoroacetylacetonate) exhibiting single-ion magnet (SIM) behavior. The performed analysis of the magnetic characteristics based on the complementary experimental techniques such as static and dynamic magnetic measurements, electron paramagnetic resonance spectroscopy in conjunction with the theoretical modeling (parametric Hamiltonian and ab initio calculations) demonstrates that the SIM properties of I arise from the nonuniaxial magnetic anisotropy with strong positive axial and significant rhombic contributions.