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首页> 外文期刊>International Journal of Quantum Chemistry >Low-dimensional compounds containing cyano groups. XIV. Crystal structure, spectroscopic, thermal and magnetic properties of [CuL2][Pt(CN)(4)] complexes (L = ethylenediamine or N,N-dimethylethylenediamine)
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Low-dimensional compounds containing cyano groups. XIV. Crystal structure, spectroscopic, thermal and magnetic properties of [CuL2][Pt(CN)(4)] complexes (L = ethylenediamine or N,N-dimethylethylenediamine)

机译:含有氰基的低维化合物。十四。 [CuL2] [Pt(CN)(4)]配合物(L =乙二胺或N,N-二甲基乙二胺)的晶体结构,光谱,热和磁性能

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摘要

Violet crystals of [Cu(en)(2)][Pt(CN)(4)] and blue crystals of [Cu(dmen)(2)][Pt(CN)(4)] were crystallized from the water-methanol solution containing CuCl2 center dot 2H(2)O, ethylenediamine (en) or N,N-dimethylethylenediamine (dmen) and K-2[Pt(CN)(4)]center dot 3H(2)O. Both compounds were characterized using elemental analysis, infrared and UV-VIS spectroscopy, magnetic measurements, specific heat measurements and thermal analysis. X-ray structure analysis revealed chain-like structure in both compounds. The covalent chains are built of Cu(II) ions linked by [Pt(CN)(4)](2-) anions in the [111] and [101] direction, respectively. The Cu(II) atoms are hexacoordinated by four nitrogen atoms in the equatorial plane from two molecules of bidentate ligands L with average Cu N distance of 2.022(2) and 2.049(4) angstrom, respectively. Axial positions are occupied by two nitrogen atoms from bridging [Pt(CN)(4)](2-) anions at longer Cu-N distance of 2.537(2) and 2.600(5) angstrom, respectively. Both materials are characterized by the presence of weak anti ferromagnetic exchange coupling. Despite the one-dimensional (ID) character of the structure, the analysis of magnetic properties and specific heat at very low temperatures shows that [Cu(en)(2)][Pt(CN)(4)] behaves as two-dimensional (2D) spatially anisotropic square lattice Heisenberg magnet, while more pronounced influence of interlayer coupling is observed in [Cu(dmen)(2)][Pt(CN)(4)]. (C) 2006 Elsevier Inc. All rights reserved.
机译:[Cu(en)(2)] [Pt(CN)(4)]的紫色晶体和[Cu(dmen)(2)] [Pt(CN)(4)]的蓝色晶体从水-甲醇中结晶溶液包含CuCl2中心点2H(2)O,乙二胺(en)或N,N-二甲基乙二胺(dmen)和K-2 [Pt(CN)(4)]中心点3H(2)O。使用元素分析,红外和UV-VIS光谱,磁测量,比热测量和热分析对这两种化合物进行了表征。 X射线结构分析显示两种化合物中的链状结构。共价链由分别由[Pt(CN)(4)](2-)阴离子在[111]和[101]方向上连接的Cu(II)离子构成。 Cu(II)原子在赤道平面上由两个双齿配体L分子的六个氮原子六配位,平均Cu N距离分别为2.022(2)和2.049(4)埃。轴向位置被桥接两个[Pt(CN)(4)](2-)阴离子的两个氮原子占据,它们的更长的Cu-N距离分别为2.537(2)和2.600(5)埃。两种材料均以弱的反铁磁交换耦合为特征。尽管该结构具有一维(ID)特性,但在极低温度下的磁性能和比热分析表明[Cu(en)(2)] [Pt(CN)(4)]表现为二维(2D)空间各向异性方格Heisenberg磁体,而在[Cu(dmen)(2)] [Pt(CN)(4)]中观察到更明显的层间耦合影响。 (C)2006 Elsevier Inc.保留所有权利。

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