학술논문
Copper Complexes with Neutral N4 Tripodal Ligands: Influence of the Number of Nitrogen Donors on Their Structures, Properties, and Reactivity
Document Type
Article
Source
European Journal of Inorganic Chemistry; September 2009, Vol. 2009 Issue: 26 p3921-3934, 14p
Subject
Language
ISSN
14341948; 10990682
Abstract
Copper coordination complexes of the neutral tetradentate nitrogencontaining ligands tris3,5dimethylpyrazol1ylmethylamine L0N4 and tris3,5diisopropylpyrazol1ylmethylamine L1N4, namely the copperII chlorido complexes [CuIIL0N4Cl2] 1 and [CuIIL1N4Cl2] 2, the copperII nitrato complexes [CuIIL0N4NO3]NO33 and [CuIIL1N4NO3]NO34, and the copperII sulfato complexes [CuIIL0N4SO4] 5 and [CuIIL1N4SO4] 6, and the copperI complexes [CuIL0N4]PF67 and [CuIL0N4PPh3]ClO48, have been systematically synthesized in order to investigate the influence of the number of nitrogen donors on their structures, properties, and reactivity. All copperII complexes were fully characterized by Xray crystallography and by IRfarIR, UVVis absorption, and ESR spectroscopy. Although the structure of 7was not determined by Xray crystallography, this complex and the structurally characterized copperI triphenylphosphane complex 8were fully characterized by IRfarIR and NMR spectroscopy. A comparison of the copperII complexes with two trispyrazol1ylmethylamine ligands with different bulkiness of the pyrazolyl rings has allowed us to evaluate the second coordination sphere effects of the ligands. Moreover, the structures and physicochemical properties of these complexes are compared with those of related complexes containing the neutral tridentate trispyrazolylmethane ligand and the neutral bidentate bispyrazolylmethane ligand. Finally, the relative stability of the copperI complexes is discussed. The influence of the number of nitrogen donors in copper complexes is observed from these systematic results.© WileyVCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009