Thiocarbohydrazones have been used as building blocks in self-assembly
of tetranuclear molecular square structures. In particular, mixed-valence iron(II)-
iron(III), nickel(II), zinc(II) and cadmium(II) clusters have been synthesised
starting from 1,5-bis(2-acetylpyridine)thiocarbohydrazone or related derivatives.1-
3 Reactions of the same ligands with copper(II) produced dimmers of dimeric
units held together by extraneous bridging ligands.3,4
We discovered that the 1,5-bis(2-hydroxybenzaldehyde)thiocarbohydrazon
e, H4L, reacts with copper(II) acetate in DMF/ethanol 1:10, in the presence of
triethylamine, followed by re-crystallization from DMF, to give a green-brown
complex, [Cu8L4(DMF)8(H2O)]·3.5DMF·0.7H2O. The structure of the complex,
established by X-ray diffraction methods and some spectroscopic properties will
be discussed.
Acknowledgements
The authors are indebted to INTAS (Project Nr. 03-51-4532) for financial
support.
References
[1] H. Gang, G. Dong, D. Chun-Ying, M. Hong, M. Qing-jin, New J. Chem. 2002,
26, 1371−1377.
[2] M. Akbar Ali, P.V. Bernhardt, C. Lee Kiem, A. Huq Mirza, Aust. J. Chem. 2004,
57, 409−413.
[3] H. Cheng, D. Chun-ying, F. Chen-jie, L. Yong-jiang, M. Qing-jin, J. Chem.
Soc. Dalton Trans. 2000, 1207−1212.
[4] B. Moubaraki, K.S. Murray, J.D. Ranford, J.J. Vittal, X. Wang, Y. Xu, J. Chem.
Soc. Dalton Trans. 1999, 3573−3578.