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Ligand exchange in TREN-based cobalt (II) funnel complexes in the solid state

par Nyssen, Nicolas ;De Leener, Gaël ;Luhmer, Michel ;Colasson, Benoit;Jabin, Ivan ;Višnjevac, Aleksandar;Reinaud, Olivia
Référence Journal of molecular structure, 1344, page (142970)
Publication Publié, 2025-06-15

Article révisé par les pairs

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Résumé :

The coordination of CoII with two calixarene-based TREN [tris(2-aminoethyl)amine] ligands is reported. The two ligands differ for the presence of three anisole groups (in Calix-TRENMe) or three phenol groups (in Calix-TRENH) in the macrocyclic structure surrounding the CoIITREN core. Dicationic complexes [CoII(CH3CN)Calix-TRENMe][ClO4]2 and [CoII(CH3CN)Calix-TRENH][ClO4]2 were synthesized and fully chemically characterized. Surprisingly, a crystal-to-crystal transformation led to the substitution of the acetonitrile guest ligand in [CoII(CH3CN)Calix-TRENMe][ClO4]2 by a pair of H-bonded water molecules and formation of a new complex [CoII(OH2∙∙∙OH2)Calix-TRENMe][ClO4]2. This gave rise to the first example of an X-ray characterized aqua-complex with a CoII centre confined in a neutral, 5-coordinate N4(OH2) environment.