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Título : Synthesis and characterization of T[Ni(CN)4] 2pyz with T¼Fe, Ni; pyz¼pyrazine: Formation of T–pyz–Ni bridges
Palabras clave : Crystal chemistry
Structural study
Layered compound
Pillared solid
Spin transition
Fecha de publicación : 16-ene-2013
Editorial : Journal of Solid State Chemistry
Descripción : The formation of T–pyz–Ni bridges (pyz¼pyrazine) in the T[Ni(CN)4] 2pyz series is known for T¼Mn, Zn, Cd and Co but not with T¼Fe, Ni. In this contribution the existence of such bridges also for T¼Fe, Ni is discussed. The obtained pillared solids, T[Ni(CN)4] 2pyz, were characterized from XRD, TG, UV–Vis, IR, Raman, M¨ossbauer and magnetic data. Their crystal structures were refined in the orthorhombic Pmna space group from XRD powder patterns. The structural behavior of these solids on cooling down to 77 K was also studied. In the 180–200 K temperature range the occurrence of a structural transition to a monoclinic structure (P21/c space group) was observed. No temperature induced spin transition was observed for Fe[Ni(CN)4] 2pyz. The iron (II) was found to be in high spin electronic state and this configuration is preserved on cooling down to 2 K. The magnetic data indicate the occurrence of a low temperature weak anti-ferromagnetic interaction between T metal centers within the T[Ni(CN)4] layer. In the paramagnetic region for Ni[Ni(CN)4] 2pyz, a reversible temperature induced spin transition for the inner Ni atom was detected. & 2011 Elsevier Inc. All rights reserved.
URI : http://www.repositoriodigital.ipn.mx/handle/123456789/10780
Otros identificadores : Journal of Solid State Chemistry 184 (2011) 2124–2130
Aparece en las colecciones: Doctorado

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