Square-planar copper(II) halide complexes of tridentate ligands with π–π stacking interactions and alternating short and long Cu⋯Cu distances
| Autor: | Urho Turpeinen, Jan Reedijk, Ramu Kannappan, Ilpo Mutikainen, Stefania Tanase |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
010405 organic chemistry
Chemistry Ligand Inorganic chemistry Imine Stacking chemistry.chemical_element Chromophore 010402 general chemistry 01 natural sciences Copper 0104 chemical sciences law.invention Inorganic Chemistry chemistry.chemical_compound Crystallography law Pyridine Materials Chemistry Molecule Physical and Theoretical Chemistry Electron paramagnetic resonance |
| Zdroj: | Inorganica Chimica Acta. 358:383-388 |
| ISSN: | 0020-1693 |
| DOI: | 10.1016/j.ica.2004.09.003 |
| Popis: | The preparation of a new tridentate N2O-donor ligand N-(2-pyridylmethyl)-3-methoxysalicylaldiminato (HL) is described, together with the corresponding copper(II) complexes [Cu(L)X] (X = Cl−, Br−). The compounds were characterized by elemental analysis, spectral, magnetic and crystallographic studies. In both compounds, the local molecular structure of the Cu(II) ion involves a square-planar CuN2OX chromophore, consisting of a deprotonated phenolate oxygen, an imine nitrogen, the pyridine nitrogen and X. In the solid state, π–π stacking interactions are dominantly present, involving the pyridine and phenolate rings of neighboring molecules, which lead to a one-dimensional arrangement with alternating short and long Cu ⋯ Cu distances of [3.720, 4.599 A] for the bromo complex and of [3.698, 4.696 A] for the chloro complex. The temperature-dependent magnetic measurements and EPR data of polycrystalline samples, as well as of frozen solutions in CHCl3 show that there is no observable exchange interaction between the Cu ions. The EPR parameters (g∥, A∥) agree with a perfect planar geometry, just as found in the X-ray analysis. |
| Databáze: | OpenAIRE |
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