摘要:
The metal templated Cd(II) cyclocondensation of 2,6-diacetylpiridine or 2,6-pyridinedicarbaldehyde and two different amines containing piperazine moieties have been investigated. The resulting ligands, L-1 and L-2 are 16- and L-3 and L-4 17-membered pentaaza macrocycles. The complexes have been characterized by a variety of methods including IR, H-1, C-13 NMR, DEPT, COSY(H,H), HMQC(H,C), FAB spectrometry and conductivimetry measurements. The crystal structures of [(CdLCl)-Cl-2](CH3OH)ClO4 (2) and [CdL4(NO3)(H2O)]-ClO4 (4) have been also determined, and it was shown that the geometry of the Cd(II) ion in the complexes is slightly distorted pentagonal pyramidal and pentagonal bipyramidal, respectively. The gas-phase structures of ligands, L-2 and L-4 and their Cd(II) complexes have also theoretically studied. (c) 2009 Published by Elsevier Ltd.