Example：10.1021/acsami.1c06204 or Chem. Rev., 2007, 107, 2411-2502
The Quest for Large Group 13 Metallacalixarenes Based on Benzymidazolyl Ligands and Al and Ga Alkyls European Journal of Inorganic Chemistry (IF2.524), Pub Date : 2021-08-27, DOI: 10.1002/ejic.202100583 Mariana L. Díaz-Ramírez, Hannah Huggins, Bruno Donnadieu, Nazario Lopez, Miguel-Ángel Muñoz-Hernández
Metallacalix[n]arenes derived from AlMe3 or GaMe3 with either 2-bromo-1H-benzimidazole, 2-Brbzim, or 2-ethyl-1H-benzimidazole, 2-Etbzim, were obtained by coordination self-assembly. SCXRD and 1H and 13C NMR in solution are consistent with the isolation of metallacalixarenes 1 and 2, respectively. SCXRD molecular structures of 2-Etbzim-based metallacalix[n]arenes show an alumacalixarene complex, 3, and a gallacalixarene, 4. 1H and 13C NMR for 3 and 4 show three species coexisting in solution. The electronic properties of 1–4 along with previously reported [2-MebzimAlMe2]4 and [2-MebzimGaMe2]4 were investigated by DFT single point calculations. For the large aluma- and gallametallacalix[n]arenes, the analysis of the electrostatic potential show that charge complementarity along with a more flexible cavity than for metallacalixarenes renders self-encapsulation.