A novel polymeric Cu(II) assemblage and a monomeric Ni(II) complex from a new easy-to-prepare flexible polytopic ligand : synthesis, structural and magnetic studies

Soma Sen (1) , Chirantan Roy Choudhury (1) , Pritha Talukder (2) , Samiran Mitra (1) , Matthias Westerhausen (3) , Alexander Nikolai Kneifel (3) , Cédric Desplanches (2) , Nathalie Daro (2) , Jean-Pascal Sutter (2, 4)

1 Department of Chemistry
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
3 Institute of Inorganic and Analytical Chemistry
4 LCC - Laboratoire de chimie de coordination

The difference in coordination behavior of one new flexible polytopic ligand H2L (L = C16H14N6O2) has been examined with Cu(II) and Ni(II) acetate. It leads to the formation of a polynuclear pentacoordinated Cu(II) assemblage and a mononuclear four coordinated Ni(II) complex. Both the compounds are characterized spectroscopically and electrochemically. In the complexes 1 and 2 the ligand binds the metal centers in trans- and cis-orientation (exo and endo-fashion), respectively. The polynuclear copper complex exhibits strong antiferromagnetic behavior at low temperature with J = −327 cm−1 and DFT calculation is also carried out for this complex.

Mots clés: Copper(II) complexes; Nickel(II) complexes; Bis-tridentate ligand; Crystal structures; Magnetic study

Domaines: Matériaux

Soma Sen, Chirantan Roy Choudhury, Pritha Talukder, Samiran Mitra, Matthias Westerhausen, et al.. A novel polymeric Cu(II) assemblage and a monomeric Ni(II) complex from a new easy-to-prepare flexible polytopic ligand : synthesis, structural and magnetic studies. Polyhedron, 2006, 25 (6), pp.1271-1278. ⟨10.1016/j.poly.2005.09.008⟩. ⟨hal-00021537⟩