Structural and photo-induced magnetic properties of M2II [WIV(CN)8]•xH2O (M = Fe and x=8, Cu and x=5).: Comparison with Cu2II[MoIV(CN)8]•7.5H2O
Structural and photo-induced magnetic properties of M2II [WIV(CN)8]•xH2O (M = Fe and x=8, Cu and x=5).: Comparison with Cu2II[MoIV(CN)8]•7.5H2O
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DOI：
10.1016/s0020-1693(01)00578-3
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发表时间：
2001-12-17
影响因子：
2.8
通讯作者：
Lecante, P
中科院分区：
文献类型：
--
作者：
Rombaut, G;Mathonière, C;Lecante, P
本文描述了由W-IV（CN）（8）（4-）和M ~（2+）= Fe-II，Cu-II所构成的扩展网络，记作Fe-W for Fe ~（2-）[W-IV（CN）（8）]（.）8H（2）O和Cu-W对于Cu-2（II）[W-IV（CN）（8）]（.）5H（2）O.在M = Fe的四元体系中求解了晶体结构。并且由具有交替的W（CN）（8）和Fe（H2O）（2）单元的三维（3D）结构组成，导致由两个垂直网格形成的架构。X射线粉末研究表明，M = Cu-II的化合物结晶在正交晶系。为了获得网络的结构信息，化合物也进行了研究的WAXS技术。结果表明，两种化合物具有相似的结构。所有这些结构特征与先前获得的M-2（II）[Mo-IV（CN）（8）]（.）xH（2）O分别表示为Fe-Mo和Cu-Mo（M = Fe和Cu）。Fe-W和Fe-Mo化合物显示出相同的三维网络，而Cu化合物的粉末则不同：Cu-W结晶良好，Cu-Mo结晶不良。W类似物的磁性显示通过抗磁性间隔物NC-W-IV-CN的弱反铁磁相互作用。在不同的波长（gimel = 413和530 nm）的光磁研究进行的Cu化合物。没有观察到的效果，而光诱导的磁有序得到的Cu-Mo，解释由光诱导的电子转移之间的Mo-IV和Cu-II金属中心。结合化合物的结构特征对这些结果进行了讨论。(C)2001 Elsevier Science B. V.保留所有权利。
This article describes bimetallic extended networks built from W-IV(CN)(8)(4-) and M2+ = Fe-II, Cu-II, denoted hereafter as Fe-W for Fe-2(II)[W-IV(CN)(8)](.)8H(2)O and Cu-W for Cu-2(II)[W-IV(CN)(8)](.)5H(2)O. The crystal structure was solved in the tetragonal system for M = Fe. and consists of a three-dimensional (3D) structure with alternating W(CN)(8) and Fe(H2O)(2) units leading to an architecture formed by two perpendicular grids. X-ray powder studies for M = Cu-II have revealed that the compound crystallizes in the orthorhombic system. In order to obtain structural information of the network, the compounds have also been investigated by the WAXS technique. The results proved that both compounds adopt a similar architecture. All these structural features are compared to those obtained previously for M-2(II)[Mo-IV(CN)(8)](.)xH(2)O denoted as Fe-Mo and Cu-Mo for M = Fe and Cu, respectively. Fe-W and Fe-Mo compounds show identical 3D networks, whereas powders of Cu compounds are different: Cu-W is well crystallized and Cu-Mo is poorly crystallized. The magnetic properties of the W analogs revealed weak antiferromagnetic interactions through the diamagnetic spacer NC-W-IV-CN. The photomagnetic studies at different wavelengths (gimel = 413 and 530 nm) were performed for the Cu compounds. No effect was observed for Cu-W, whereas a photo-induced magnetic ordering is obtained for Cu-Mo, explained by a photo-induced electron transfer between the Mo-IV and Cu-II metal centers. These results are discussed in relation with the structural features of the compounds. (C) 2001 Elsevier Science B.V. All rights reserved.