title: A water sensitive ferromagnetic [Ni(cyclam)]2[Nb(CN)8] network.
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.
authors.affiliation: Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland. beata.nowicka@uj.edu.pl
authors.forename: Beata
authors.initials: B
authors.lastname: Nowicka
authors.forename: Maria
authors.initials: M
authors.lastname: Bałanda
authors.forename: Mateusz
authors.initials: M
authors.lastname: Reczyński
authors.forename: Anna M
authors.initials: AM
authors.lastname: Majcher
authors.forename: Marcin
authors.initials: M
authors.lastname: Kozieł
authors.forename: Wojciech
authors.initials: W
authors.lastname: Nitek
authors.forename: Wiesław
authors.initials: W
authors.lastname: Łasocha
authors.forename: Barbara
authors.initials: B
authors.lastname: Sieklucka
mesh_terms: D003494:Cyclamates / Q000138:chemical synthesis / Q000737:chemistry*; D060526:Magnetic Fields; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D003494:Cyclamates; C581999:Ni(cyclam)2Nb(CN)8; D009942:Organometallic Compounds; D014867:Water