Magneto-Structural Correlations in Cu(tn)Cl2 (tn = 1,3-Diaminopropane): Two-Dimensional Spatially Anisotropic Triangular Magnet Formed by Hydrogen Bonds
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- 作者：Vladimí ; r Zele<img src="http ; //pubs.acs.org/images/entities/ncaron.gif" border="0">á ; k ; Al<img src="http ; //pubs.acs.org/images/entities/zcaron.gif" border="0">beta Orendá ; <img src="h
- 刊名：Inorganic Chemistry
- 出版年：2006
- 出版时间：February 20, 2006
- 年：2006
- 卷：45
- 期：4
- 页码：1774 - 1782
- 全文大小：264K
- 年卷期：v.45,no.4(February 20, 2006)
- ISSN：1520-510X
文摘
A novel polymeric one-dimensional compound Cu(tn)Cl2 (tn = 1,3-diaminopropane) was prepared and structurallycharacterized, and its spectral, magnetic, thermodynamic, and thermal properties were studied. The unique structureshows ladderlike chains composed of CuII atoms and chloro bridging ligands [Cu(-<IMG SRC="/images/entities/mgr.gif">3-Cl-)Cu2] running along thecrystallographic c axis. The coordination geometry about copper (4 + 2) approximates that of a strongly elongatedoctahedron. The equatorial plane of the coordination octahedron is formed by a chelate N-bonded tn ligand andtwo chloro ligands. One of the chloro ligands is terminal, and the other one, 
3-Cl-, forms two additional longerbonds to the neighboring copper atoms and thus occupies the axial octahedral positions. The electronic groundstate of the CuII ion is of dz2 symmetry and suggests the activation of intraladder and interladder Cl···H-N hydrogenbonds as exchange paths that form a two-dimensional pattern of a triangular symmetry. The interaction due to thehydrogen bonds seems to play an important role in molecular packing and magnetic coupling. The studies ofmagneto-structural correlations including electron paramagnetic resonance measurements and thermodynamic andmagnetic properties revealed a two-dimensional character of magnetic correlations with the effective intralayerexchange coupling J/kB 
-3 K. No phase transition to the ordered state has been observed down to 60 mK.Cu(tn)Cl2 with the interlayer coupling J' 10-3J and moderate intralayer interaction represents an excellent exampleof a two-dimensional magnetic system.
3-Cl-, forms two additional longerbonds to the neighboring copper atoms and thus occupies the axial octahedral positions. The electronic groundstate of the CuII ion is of dz2 symmetry and suggests the activation of intraladder and interladder Cl···H-N hydrogenbonds as exchange paths that form a two-dimensional pattern of a triangular symmetry. The interaction due to thehydrogen bonds seems to play an important role in molecular packing and magnetic coupling. The studies ofmagneto-structural correlations including electron paramagnetic resonance measurements and thermodynamic andmagnetic properties revealed a two-dimensional character of magnetic correlations with the effective intralayerexchange coupling J/kB -3 K. No phase transition to the ordered state has been observed down to 60 mK.Cu(tn)Cl2 with the interlayer coupling J' 10-3J and moderate intralayer interaction represents an excellent exampleof a two-dimensional magnetic system.