Electrochemical synthesis and structural characterization of Co(II), Ni(II) and Cu(II) complexes of N,N-bis(4,5-dimethyl-2-hydroxybenzyl)-N-(2-pyridylmethyl)amine.
The electrochemical oxidation of anodic metal (cobalt, nickel or copper) in a cell containing an acetonitrile solution of the ligand N,N-bis(4,5-dimethyl-2-hydroxybenzyl)-N-(2-pyridylmethyl)amine (H2L) affords complexes [Co2L2].H2O (1), [Ni3L3] (2) and [Cu2L2] 3H2O (4). On using nickel as the anode and the addition to the solution electrolytic phase of the amount of water necessary to saturate the solution, the electrolytic process gave rise to the new compound [Ni2L2(H2O)1.5].CH3CN (3). Compounds 1 and 4 are dimeric and the metal atoms are pentacoordinated. Compound 3 also consists of dimeric neutral molecules with the nickel atoms in both penta- and hexacoordinated environments. The crystal structure of shows the presence of a trimeric compound in which the nickel atoms are hexacoordinated. Electronic, IR and FAB spectra of the complexes are discussed and related to the structural information. The magnetic behavior of 1-4 denotes the occurrence of intramolecular antiferromagnetic interactions. The values obtained for the coupling constant J are -4.2 cm(-1), -5.3 cm(-1), -30 cm(-1) and -4.7 cm(-1) for 1, 2, 3 and 4, respectively. These values are in full agreement with the structural characteristics of the compounds. The catalytic activity of the complexes towards the decomposition of hydrogen peroxide (catalase activity) was also studied.
Labisbal
Elena
E
Departamento de Química Inorgánica, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain.
Rodríguez
Laura
L
Souto
Oscar
O
Sousa-Pedrares
Antonio
A
García-Vázquez
José Arturo
JA
Romero
Jaime
J
Sousa
Antonio
A
Yáñez
Matilde
M
Orallo
Francisco
F
Real
José A
JA
D000588:Amines / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004563:Electrochemistry; D008024:Ligands; D008958:Models, Molecular; D015394:Molecular Structure; D009532:Nickel / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D010084:Oxidation-Reduction; D011725:Pyridines / Q000737:chemistry*
D000588:Amines; D008024:Ligands; C545912:N,N-bis(4,5-dimethyl-2-hydroxybenzyl)-N-(2-pyridylmethyl)amine; D009942:Organometallic Compounds; D011725:Pyridines; D003035:Cobalt; D003300:Copper; D009532:Nickel