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- W2977893453 abstract "Hydrothermal reactions of the multitopic ligand 1-hydroxy-1-(piperidin-4-yl)methylidenebisphosphonic acid (hpdpH4) with cobalt or nickel sulfates afforded two new isostructural metal phosphonates, M3II(hpdpH)2(H2O)6·4H2O [M = Co (Co-10H2O), Ni (Ni-10H2O)]. Their structures consist of parallel diamond chains of three MO6 octahedra bridged by the PO3C tetrahedra. Six of the seven oxygen atoms of the ligand are involved in coordination; for two ligands that amounts to 12 bonds for 3 MO6 and the remaining six are occupied by terminal water molecules. In addition, four water molecules sit in between the chains providing H-bonds to the formation of a 3D-net. Thermal analyses show identical two-step dehydration processes involving first the departure of six water molecules followed by the remaining four. A detailed study of the ac- and dc-magnetization as a function of temperature, field and frequency reveals associated drastic changes. The virgin form Co-10H2O is a paramagnet while its partial dehydrated form Co-4H2O is an antiferromagnet displaying canting below TN = 4.7 K and the fully dehydrated form Co is a ferrimagnet (TC = 12 K). Ni-10H2O and Ni-4H2O exhibit long-range ordered antiferromagnetism (TN = 2.7 and 4.0 K, respectively) and also become ferrimagnets (TC = 9.4 K) when fully dehydrated to Ni. The dehydrated samples can be fully rehydrated with the complete recovery of both the structures and magnetic properties." @default.
- W2977893453 created "2019-10-10" @default.
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- W2977893453 date "2019-01-01" @default.
- W2977893453 modified "2023-10-18" @default.
- W2977893453 title "Changes in magnetic order through two consecutive dehydration steps of metal-phosphonate diamond chains" @default.
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- W2977893453 doi "https://doi.org/10.1039/c9ra05722f" @default.
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