A copper(II) coordination polymer based on flexible spacer ligands: Synthesis, crystal structure, and magnetic properties of the adipato complex [Cu4(bpy)4(adip)3](tcnp)2 [bpy=C10H8N2; ; ]
| Autor: | Jean Sala-Pala, Abdelaziz Bouchama, Smail Triki, Fatima Setifi, Jean-Yves Salaün |
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| Přispěvatelé: | Université Ferhat-Abbas Sétif 1 [Sétif] (UFAS1), Chimie, Electrochimie Moléculaires et Chimie Analytique (CEMCA), Institut Brestois Santé Agro Matière (IBSAM), Université de Brest (UBO)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC) |
| Rok vydání: | 2006 |
| Předmět: |
Denticity
010405 organic chemistry Coordination polymer Ligand Stereochemistry Sodium adipate Crystal structure 010402 general chemistry 01 natural sciences Square pyramidal molecular geometry 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound Crystallography chemistry Adipate Materials Chemistry [CHIM]Chemical Sciences Carboxylate Physical and Theoretical Chemistry |
| Zdroj: | Inorganica Chimica Acta Reviews Inorganica Chimica Acta Reviews, Elsevier, 2006, 359 (10), pp.3269-3274. ⟨10.1016/j.ica.2006.04.022⟩ |
| ISSN: | 0020-1693 0073-8085 |
| DOI: | 10.1016/j.ica.2006.04.022 |
| Popis: | One-pot reaction of copper(II) chloride dihydrate CuCl2 · 2H2O with sodium adipate Na2adip ( adip 2 - = O 2 C ( CH 2 ) 4 CO 2 2 - ) in the presence of 2,2′-bipyridyl (bpy = C10H8N2) and potassium 1,1,3,3-tetracyano-2-ethoxypropenide ( tcnp - = ( NC ) 2 CC ( OEt ) C ( CN ) 2 - ) gives the new compound [Cu4(bpy)4(adip)3](tcnp)2 (1), which was characterized by single crystal X-ray diffraction analysis. Each metal ion presents an elongated square pyramidal CuN2O3 environment, with an oxygen atom in apical position and a base plane involving almost equivalent bond lengths. The structure can be described as a pseudo dinuclear species in which two Cu(bpy) units are triply bridged by two unsymmetrical bridging oxygen atoms of two carboxylate groups with a κ-μ-bridging mode and by an almost symmetrical OCO unit with a bidentate syn–syn κ:κ–μ-bridging mode. Such coordination modes generate the tetranuclear Cu2(adip)2Cu2 units which are bound by a symmetrical adipate ligand through a κ-μ-bridging mode to lead to infinite chains involving a succession of Cu2 units alternatively bridged by one or two aliphatic chains of adipate ligands. Magnetic measurements exhibit a maximum in the χm versus T plot (at ∼15.2 K), which is characteristic of weak antiferromagnetic exchange interactions between the Cu(II) ions bridged by the carboxylate groups. Fit of the magnetic data with appropriate model led to J value of −7.74 cm−1 (the Hamiltonian is written as H = −2JSaSb). |
| Databáze: | OpenAIRE |
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