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|Title:||Structure and magnetism of an exchange coupled system: An NMR approach|
|Citation:||Proceedings of the Indian Academy of Sciences - Chemical Sciences, 107(4), 281-295|
|Abstract:||A binuclear copper(II) complex [Cu2L(OH)](C1O4)2�2H2O has been synthesized and characterized by X-ray crystallography and1H-NMR studies. The crystal structure shows that the bridging angles between Cu(l)-O(l)-Cu(2) and Cu(l)-O(2)-Cu(2) are 98.9(2)� and 102.2(2)� respectively. The Cu(l)-Cu(2) distance is 3.0097(12)�. This indicates that the interaction between the two copper atoms is antiferromagnetic in nature. The geometry around Cu(l) is distorted square-pyramid with one water molecule occupying the axial fifth position, whereas, the geometry around Cu(2) is distorted square-planar with weak interactions of one of the perchlorate anion. There are eight molecules present in the unit cell. There is an interdimer interaction between the dimers. The temperature-dependent1H-NMR chemical shift studies have been performed on six different protons of this complex which reveals that the exchange coupling constant (- 2J) is same for all protons (208 � 1 cm-1). However, the hyperfine coupling constant (A?) was found to be different in magnitude as well as in sign. We also report solvent dependent NMR properties. ? 1995 Indian Academy of Sciences.|
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