This study presents the novel hexacoordinated Co(ii) mononuclear complex with SIM behavior.

Herein, we report on synthesis and magnetic properties of Co(II) coordination compound with 1,1'-bis(1-((pyrid-2-ylmethylene)hydrazono)ethyl)ferrocene (L) ligand with general formula [CoLCl2]. The analysis of static magnetic data supported by the CASSCF/NEVPT2...

A new hexacoordinate Co(II) complex with the general formula [CoL(NCS) 2 ]•DMSO (1) (L = biscondensation product of diacetyl and 2-hydrazinyl-4,6-dimethylpyrimidine, DMSO = dimethylsulfoxide) exhibiting field-induced single-ion magnet (SIM) behavior has been obtained and characterized. To explain such field-induced SIM behavior, we have performed the analysis of the observed direct current (DC) magnetic properties based on the Griffiths Hamiltonian in combination with the highlevel quantum-chemical calculations of the crystal field parameters. The complex has been shown to exhibit strong easy-axis-type magnetic anisotropy arising from a large negative value Δ ax = −1538.0 cm −1 of the axial crystal parameter, which is accompanied by a weak rhombic contribution with |Δ rh | = 219.3 cm −1 . Magnetic properties of 1 have been compared with the previously studied field-induced SIM compound [CoLCl 2 ]•H 2 O (2). Introduction of a thiocyanide anion in 1 (instead of chloride in 2) in the Co(II) coordination sphere resulted in improvement of uniaxial magnetic anisotropy and switch of the relaxation process from the combination of direct and Raman mechanisms in 2 to Orbach-type one in complex 1. Effects of substitution of acidoligands in the Co(II) coordination sphere on the crystalline structure, DC magnetic properties, magnetic anisotropy, and magnetization relaxation processes have been rationalized.

Copper(II) coordination compounds with the condensation product of the diacetylmonoxime and 2-hydrazino-4,6-dimethylpirimidine (H2L) with composition [Сu(Н2L)Br2]·Н2О (I) and [Сu(Н2L)Cl2] (II) were synthesized. Molecular structures of the compounds were established with...

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