Isomeric chain structures of {[Mn(H2O)4]2Ru2(CO3)4Br2}nn−: syntheses, structural diversity and magnetic properties

Xiao-Feng Hou; Yan-Yan Jia; Jian-Hui Yang; Zhi Cao; Bin Liu

doi:10.1039/C4DT01522C

Isomeric chain structures of {[Mn(H₂O)₄]₂Ru₂(CO₃)₄Br₂}_nⁿ⁻: syntheses, structural diversity and magnetic properties†

Xiao-Feng Hou,^a Yan-Yan Jia,^a Jian-Hui Yang,^a Zhi Cao

*^b and Bin Liu*^a

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* Corresponding authors

^a Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Materials Science, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Northwest University, Xi'an 710069, P. R. China
E-mail: liubin@nwu.edu.cn, zcao@berkeley.edu
Tel: +86 29 88302604

^b Department of Chemistry, University of California, Berkeley, California 94720, USA

Abstract

The self-assembly of Ru₂(CO₃)₄³⁻ paddle-wheel precursors and Mn²⁺ ions in aqueous solution yields various carbonate complexes. With appropriate selection of the synthetic conditions, we are able to intentionally tune the composition and structure of Mn–Ru₂-carbonate assemblies to form infinite chain structural complexes, e.g., K[{Mn(H₂O)₄}₂Ru₂(CO₃)₄Br₂]·H₂O (1) and H[{Mn(H₂O)₄}₂Ru₂(CO₃)₄Br₂]·6H₂O (2). Complexes 1 and 2 are obtained at different temperatures (25 °C for 1 and 5 °C for 2, respectively), and their crystal structures consist of brick-wall stacked chains, in which neighboring Ru₂(CO₃)₄Br₂⁵⁻ units are linked by two disubstituted octahedral Mn(H₂O)₄²⁺ in a cis manner, resulting in two isomeric (twisted and zigzag) negative double-chain α- and β-{[Mn(H₂O)₄]₂Ru₂(CO₃)₄Br₂}_nⁿ⁻. The magnetic properties of complexes 1 and 2 were highly characterized. The alternating current (AC) susceptibility analysis of complex 1 reveals a two-step magnetism transition at T₁ = 5.0 K and T₂ = 2.6 K, respectively. Complex 2 exhibits metamagnetism behavior, with a transition field H_C = ∼1.2 kOe at 2.0 K.

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Article information

DOI: https://doi.org/10.1039/C4DT01522C
Article type: Paper
Submitted: 23 May 2014
Accepted: 01 Jul 2014
First published: 08 Jul 2014

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Dalton Trans., 2014,43, 13316-13324

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Isomeric chain structures of {[Mn(H₂O)₄]₂Ru₂(CO₃)₄Br₂}_nⁿ⁻: syntheses, structural diversity and magnetic properties

X. Hou, Y. Jia, J. Yang, Z. Cao and B. Liu, Dalton Trans., 2014, 43, 13316 DOI: 10.1039/C4DT01522C

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