Self-assembled Transition Metal Coordination Frameworks of ...

V _ i Zinc(1I) & Cadmium(lI) complexes
unequivocally confirmed for 29. Hitherto reported carbohydrazone complexes show
either mononuclear or binuclear metal complexes coordinated through N, N, O and N,
N, N atoms. The carbohydrazone-derived complexes are novel in several respects.
This is the first report where the carbonyl group is involved in the bridging mode for
carbohydrazone ligands to form molecular square grids. The novel N40 coordination
mode offers carbohydrazones as a building block for interesting framework
complexes through self-assembly. The M—O—M angles ranging from l33.9l(13)° to
l36.07(l3)° for Zn(lI) square grid 29 seem interesting since it leaves a possibility of
orthogonal magnetic orbitals for future metal {especially for metals like Co(II)}
complexes of these types and that might exhibit ferromagnetic behaviour with similar
suitably substituted carbohydrazone ligands.
References
l. A. Sreekanth, S. Sivakumar, M.R.P. Kurup, J. Mol. Struct. 655 (2003) 47.
2. E. Labisbal, A. Sousa, A. Castineiras, J.A.G. Vazquez, J. Romero, D.X.
West, Polyhedron 19 (2000) 1255.
3. L. Latheef, E. Manoj, M.R.P. Kurup, Polyhedron 26 (2007) 4107.
4. E. Bermejo, A. Castineiras, l.G. Santos, D.X. West, Z. Anorg. Allg. Chem.
630 (2004) 1096.
5. I. Garcia, E. Bermejo, A.K. El Sawaf, A. Castineiras, D.X. West, Polyhedron
2l (2002) 729.
6. E. Labisbal, A.S. Pedrares, A. Castineiras, J.K. Swearingen, D.X. West,
Polyhedron 21 (2002) 1553.
7. G. Ibrahim, M.A. Khan, G.M. Bouet, Trans. Met. Chem. 27 (2002) 34.
8. N.C. Kasuga, K. Sekino, M. lshikava, A. Honda, M. Yokoyama, S. Nakano,
N. Shimada, C. Koumo, K. Nomiya, J. lnorg. Biochem. 96 (2003) 298.
267