| Autor: |
Gamage, Eranga H., Greenfield, Joshua T., Unger, Colin, Kamali, Saeed, Clark, Judith K., Harmer, Colin P., Luo, Liang, Wang, Jigang, Shatruk, Michael, Kovnir, Kirill |
| Zdroj: |
Inorganic Chemistry; September 2020, Vol. 59 Issue: 18 p13353-13363, 11p |
| Abstrakt: |
A one-dimensional (1D) chain compound [Fe(en)3]3(FeSe2)4Cl2(en= ethylenediamine), featuring tetrahedral FeSe2chains separated by [Fe(en)3]2+cations and Cl–anions, has been synthesized by a low temperature solvothermal method using simple starting materials. The degree of distortion in the Fe–Se backbone is similar to previously reported compounds with isolated 1D FeSe2chains. 57Fe Mössbauer spectroscopy reveals the mixed-valent nature of [Fe(en)3]3(FeSe2)4Cl2with Fe3+centers in the [FeSe2]−chains and Fe2+centers in the [Fe(en)3]2+complexes. SQUID magnetometry indicates that [Fe(en)3]3(FeSe2)4Cl2is paramagnetic with a reduced average effective magnetic moment, μeff= 9.51 μBper formula unit, and a negative Weiss constant, θ = −10.9(4) K, indicating antiferromagnetic (AFM) nearest neighbor interactions within the [FeSe2]−chains. Weak antiferromagnetic coupling between chains, combined with rather strong intrachain AFM coupling, leads to spin-glass behavior at low temperatures, as indicated by a frequency shift of the peak observed at 3 K in AC magnetic measurements. A combination of [Fe(en)3]2+and Cl–ions is also capable of stabilizing mixed-valent 2D Fe–Se puckered layers in the crystal structure of [Fe(en)3]4(Fe14Se21)Cl2, where Fe14Se21layers have a unique topology with large open pores. Property measurements of [Fe(en)3]4(Fe14Se21)Cl2could not be performed due to the inability to either grow large crystals or synthesize this material in single-phase form. |
| Databáze: |
Supplemental Index |
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