1. A water sensitive ferromagnetic [Ni(cyclam)]2[Nb(CN)8] network.
- Author
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Nowicka B, Bałanda M, Reczyński M, Majcher AM, Kozieł M, Nitek W, Łasocha W, and Sieklucka B
- Subjects
- Cyclamates chemical synthesis, Models, Molecular, Organometallic Compounds chemical synthesis, Cyclamates chemistry, Magnetic Fields, Organometallic Compounds chemistry, Water chemistry
- Abstract
Reaction between [Ni(cyclam)](2+) and [W(CN)(8)](4-) leads to the formation of a 3D diamond-like network [Ni(cyclam)](2)[W(CN)(8)]·3.5H(2)O (1). The structure is characterised by a network of intersecting channels of 3-4 Å in diameter, filled with crystallisation water, most of which is released upon drying in air, causing the crystals to collapse. Analogous compound [Ni(cyclam)](2)[Nb(CN)(8)]·3.5H(2)O (2), based on paramagnetic Nb(IV), could only be obtained as a powder, due to the decomposition of the [Nb(CN)(8)](4-) complex under slow diffusion conditions. It shows long-range magnetic ordering with T(C) = 11.8 K and magnetic hysteresis at 2 K. These properties are lost upon drying in air. After rehydration differently shaped hysteresis appears, which together with AC susceptibility measurements suggests the formation of a multiphase system. Subsequent dehydration-rehydration experiments show partial reversibility.
- Published
- 2013
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