Abstract
To develop a new spin-crossover functional material, a magnetic hybrid compound [Fe(qsal)2][Ni(mnt)2] was designed and synthesized (Hqsal = N-(8-quinolyl)salicylaldimine, mnt = maleonitriledithiolate). The temperature dependence of magnetic susceptibility suggested the coexistence of the high-spin (HS) Fe(III) cation and π-radical anion at room temperature and a magnetic transition below 100 K. The thermal variation of crystal structures revealed that strong π-stacking interaction between the π-ligand in the [Fe(qsal)2] cation and [Ni(mnt)2] anion induced the distortion of an Fe(III) coordination structure and the suppression of a dimerization of the [Ni(mnt)2] anion. Transfer integral calculations indicated that the magnetic transition below 100 K originated from a spin-singlet formation transformation in the [Ni(mnt)2] dimer. The magnetic relaxation of Mössbauer spectra and large thermal variation of a g-value in electron paramagnetic resonance spectra below the magnetic transition temperature implied the existence of a magnetic correlation between d-spin and π-spin.
Highlights
Spin-crossover (SCO) between a high-spin (HS) and low-spin (LS) state in a transition metal coordination compound is one of the molecular bistable phenomena responsive to various external stimuli such as temperature, pressure, light, magnetic field, and chemicals
We reported the synthesis and characterization of π-d multi-spin magnetic compound
The Fe(III) center in the present compound was in the HS state and did not exhibit an SCO phenomenon, whereas a spin-singlet transition of the [Ni(mnt)2 ] dimer was clearly evidenced
Summary
Spin-crossover (SCO) between a high-spin (HS) and low-spin (LS) state in a transition metal coordination compound is one of the molecular bistable phenomena responsive to various external stimuli such as temperature, pressure, light, magnetic field, and chemicals. The SCO switches a spin-state, and electronic state and coordination structure in a metal complex. 5, 54 compounds between SCO and other solid-state electronic properties such as conductivity [5,6,7,8,9,10,11,12], conductivity[13,14,15,16,17,18,19,20,21,22,23],. The goal of one this can research is magnetism optical properties [5,6,7,8,9,10,11,12],and magnetism [13,14,15,16,17,18,19,20,21,22,23], and optical properties [24,25].
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