A water sensitive ferromagnetic [Ni(cyclam)](2)[Nb(CN)(8)] network

作者：Nowicka Beata^*; Balanda Maria; Reczynski Mateusz; Majcher Anna M; Koziel Marcin; Nitek Wojciech; Lasocha Wieslaw; Sieklucka Barbara

来源：Dalton Transactions, 2013, 42(7): 2616-2621.

DOI：10.1039/c2dt32299d

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)]center dot 3.5H(2)O (1). The structure is characterised by a network of intersecting channels of 3-4 angstrom 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)]center dot 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.

• 出版日期2013