Synthesis and crystal structure of some new cadmium (II) macrocyclic Schiff-base complexes containing piperazine moiety |
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| Authors: | Hassan Keypour, Majid Rezaeivala, Laura Valencia, Sadegh Salehzadeh, Paulo Pe rez-Lourido,Hamid Reza Khavasi |
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| Affiliation: | aFaculty of Chemistry, Bu-Ali Sina University, Hamedan 65174, Iran;bDepartamento de Química Inorgánica, Facultad de Química, Universidade de Vigo, 36310 Vigo, Pontevedra, Spain;cDepartment of Chemistry, Shahid Beheshti University, G.C., Evin, Tehran 1983963113, Iran |
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| Abstract: | 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, L1 and L2 are 16- and L3 and L4 17-membered pentaaza macrocycles. The complexes have been characterized by a variety of methods including IR, 1H, 13C NMR, DEPT, COSY(H,H), HMQC(H,C), FAB spectrometry and conductivimetry measurements. The crystal structures of [CdL2Cl](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, L2 and L4 and their Cd(II) complexes have also theoretically studied. |
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| Keywords: | Piperazine moiety Macrocyclic Schiff-base complexes Cadmium(II) complexes NMR study X-ray crystal structure Theoretical study |
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