Publication Date

9-1-2020

Department

Ames Laboratory; Chemistry; Physics and Astronomy

Campus Units

Ames Laboratory, Chemistry, Physics and Astronomy

OSTI ID+

1668259

Report Number

IS-J 10299

DOI

10.1021/acs.inorgchem.0c01727

Journal Title

Inorganic Chemistry

Volume Number

59

Issue Number

18

First Page

13353

Last Page

13363

Abstract

A one-dimensional (1D) chain compound [Fe(en)3]3(FeSe2)4Cl2 (en = ethylenediamine), featuring tetrahedral FeSe2 chains 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 FeSe2 chains. 57Fe Mössbauer spectroscopy reveals the mixed-valent nature of [Fe(en)3]3(FeSe2)4Cl2 with 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)4Cl2 is paramagnetic with a reduced average effective magnetic moment, μeff, of 9.51 μB per formula, 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 Fe14Se21 layers have a unique topology with large open pores. Property measurements of [Fe(en)3]4(Fe14Se21)Cl2 could not be performed due to the inability to either grow large crystals or synthesize this material in single-phase form.

DOE Contract Number(s)

AC02-07CH11358; DMR-1905499; DMR-2003783; AC02-06CH11357

Language

en

Department of Energy Subject Categories

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Available for download on Wednesday, September 01, 2021

Share

COinS