Synthesis of a tube-like tetra-bipyridyl, tetra-ethylacetato-calix[4]arene in 1,3-alternate conformation and the unexpected crystal structure of its [bpy(CoCl<sub>2</sub>)]<sub>3</sub>-[bpy(CoCl<sub>2</sub>)(H<sub>2</sub>O)] complex - L2CM - Laboratoire Lorrain de Chimie Moléculaire
Article Dans Une Revue New Journal of Chemistry Année : 2024

Synthesis of a tube-like tetra-bipyridyl, tetra-ethylacetato-calix[4]arene in 1,3-alternate conformation and the unexpected crystal structure of its [bpy(CoCl2)]3-[bpy(CoCl2)(H2O)] complex

Résumé

Treating conic tetra-para-ethylacetato-calix[4]arene (1) with 2.2 equivalents of K2CO3 and 4 equivalents of 6-bromomethyl-60-methyl-2,20-bipyridine affords the expected fully substituted podand, mainly in its 1,3- alternate conformation (2). This tube-like bipyridyl derivative 2 was subjected to complexation studies with CoCl26H2O to give a blue tetra cobalt(II) complex species (3). This complex displays a unique group of 6 aromatic bipyridyl 1H-NMR resonance signals demonstrating its high symmetry, while X-ray diffraction studies showed the presence of 3 expected tetrahedral bpy(CoCl2) units and 1 original trigonal bipyramidal unit involving the adjunction of a fifth ligand assumed to be H2O that could participate in the crystal scaffold.

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Chimie
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hal-04826434 , version 1 (09-12-2024)

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Maxime Mourer, Younes Bouizi, Sebastien Leclerc, Bernard Malaman, Jean-Bernard Regnouf de Vains. Synthesis of a tube-like tetra-bipyridyl, tetra-ethylacetato-calix[4]arene in 1,3-alternate conformation and the unexpected crystal structure of its [bpy(CoCl2)]3-[bpy(CoCl2)(H2O)] complex. New Journal of Chemistry, 2024, 48, pp.15577 - 15589. ⟨10.1039/d4nj02476a⟩. ⟨hal-04826434⟩
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