1. Isomeric chain structures of {[Mn(H2O)4]2-Ru2(CO3)4Br2}n n-: syntheses, structural diversity and magnetic properties.
- Author
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Xiao-Feng Hou, Yan-Yan Jia, Jian-Hui Yang, Zhi Cao, and Bin Liu
- Subjects
CHAIN length (Chemistry) ,MAGNETIC properties ,RUTHENIUM compounds ,CARBONATES ,CRYSTAL structure - Abstract
The self-assembly of Ru
2 (CO3 )4 3- 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(H2 O)4 }2 Ru2 (CO3 )4 Br2 ]·H2 O (1) and H[{Mn(H2 O)4 }2 Ru2 (CO3 )4 Br2 ]·6H2 O (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 )4 Br2 5- units are linked by two disubstituted octahedral Mn(H2 O)4 2+ in a cis manner, resulting in two isomeric (twisted and zigzag) negative double-chain α- and β-{[Mn(H2 O)4 ]2 Ru2 (CO3 )4 Br2 }n n- . 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 HC = ~1.2 kOe at 2.0 K. [ABSTRACT FROM AUTHOR]- Published
- 2014
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