Synthesis, Solid and Solution Studies of Paraquat Dichloride Calixarene Complexes. Molecular Modelling

Authors

  • Irma García-Sosa Instituto Nacional de Investigaciones Nucleares
  • Flor de María Ramírez Instituto Nacional de Investigaciones Nucleares

DOI:

https://doi.org/10.29356/jmcs.v54i3.926

Keywords:

Parent calixarenes; Pesticides; Phosphorescence; Augmented Molecular Mechanics Calculations; CONFLEX.

Abstract

The interaction of the herbicide paraquat dichloride (PQ,substrate) with p-tert butylcalix[6,8]arenes (L, receptor) was investigated in both the solution and solid states. The isolated paraquat calixarene complexes were characterised by UV-visible, 1H NMR, ESI-MS, Luminescence and IR spectroscopies and elemental analysis. The stoichiometry of complexes 1 and 2 was 1:1 (1 herbicide:1 calixarene) and both revealed a biexponential luminescence decay with lifetimes depending on the size and the conformational particularity of the calixarenes. Molecular modelling suggested that both calixarenes interact with the herbicide through cation-π interaction. PQ is included in the p-tert-butylcalix[8]arene cavity, a situation favoured by its pinched conformation in polar solvent while it is partially included in the p-tert-butylcalix[6]arene cavity because of its in-out cone conformation. The theoretical results, in particular using MOPAC procedures, were in agreement with the experimental findings.

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Author Biographies

Irma García-Sosa, Instituto Nacional de Investigaciones Nucleares

Departamento de Química

Flor de María Ramírez, Instituto Nacional de Investigaciones Nucleares

Departamento de Química

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Published

2019-06-05

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Regular Articles