title: X-ray absorption spectroscopy study of novel inorganic-organic hybrid ferromagnetic Cu-pyz-[M(CN)8]3- assemblies.
abstract: We present a unique interpretation of X-ray absorption spectroscopy (XAS) spectra at Cu:K, W:L(3), and Mo:K edges of structurally related magnetic Cu(II)-[M(V)(CN)(8)](3-) compounds. The approach results in description of the structure of novel three-dimensional (3-D) Cu(II)(3)(pyz)[M(V)(CN)(8)](2)·xH(2)O, M = W (1), Mo, (2) polymers. Assemblies 1 and 2 represent hybrid inorganic-organic compounds built of {Cu(II)[W(V)(CN)(8)](-)}(n) double-layers linked by cyanido-bridged {Cu(II)-(μ-pyz)(2+)}(n) chains. These Cu(II)-M(V) systems reveal long-range magnetic ordering with T(c) of 43 and 37 K for 1 and 2, respectively. The presence of the 3-D coordination networks and 8 cyanido-bridges at M(V) centers leads to the highest Curie temperatures and widest hysteresis loops among Cu(II)-[M(V)(CN)(8)](3-) systems.
authors.affiliation: Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland. olaf.stefanczyk@uj.edu.pl
authors.forename: Olaf
authors.initials: O
authors.lastname: Stefańczyk
authors.forename: Robert
authors.initials: R
authors.lastname: Podgajny
authors.forename: Tomasz
authors.initials: T
authors.lastname: Korzeniak
authors.forename: Michał
authors.initials: M
authors.lastname: Rams
authors.forename: Marcin
authors.initials: M
authors.lastname: Kozieł
authors.forename: Wiesław
authors.initials: W
authors.lastname: Łasocha
authors.forename: Dariusz A
authors.initials: DA
authors.lastname: Zając
authors.forename: Barbara
authors.initials: B
authors.lastname: Sieklucka