X 射线吸收光谱研究新型无机-有机杂化铁磁 Cu-pyz-[M(CN)8]3- 组装体。

X-ray absorption spectroscopy study of novel inorganic-organic hybrid ferromagnetic Cu-pyz-[M(CN)8]3- assemblies.

机构信息

Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland.

出版信息

Inorg Chem. 2012 Nov 5;51(21):11722-9. doi: 10.1021/ic301634m. Epub 2012 Oct 8.

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) compounds. The approach results in description of the structure of novel three-dimensional (3-D) Cu(II)(3)(pyz)M(V)(CN)(8)·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) systems.

摘要

我们对结构相关的磁性 Cu(II)-M(V)(CN)(8)化合物在 Cu:K、W:L(3)和 Mo:K 边缘的 X 射线吸收光谱 (XAS) 谱进行了独特的解释。该方法可用于描述新型三维 (3-D) Cu(II)(3)(pyz)M(V)(CN)(8)·xH(2)O，M = W (1)、Mo (2)聚合物的结构。化合物 1 和 2 是由 {Cu(II)W(V)(CN)(8)}(n) 双层通过氰根桥联 {Cu(II)-(μ-pyz)(2+)}(n) 链连接而成的混合无机-有机化合物。这些 Cu(II)-M(V)体系表现出长程磁有序，化合物 1 和 2 的 T(c)分别为 43 和 37 K。在 M(V)中心存在 3-D 配位网络和 8 个氰根桥，使得这些 Cu(II)-M(V)(CN)(8)体系具有最高的居里温度和最宽的磁滞回线。