The solid-state structures of eight complexes between para-sulfonato-calix[4]arene (C4S) and bipyridinium derivatives, 4,4 0 -bipyridine (BP), 1,2-bis(4-pyridyl)ethane (BPE), and 1,3-bis(4-pyridyl)propane (BPP), have been determined. All the complexes show high degrees of solvation, involving water and ethanol or methanol or acetone. The observed host/guest stoichiometry is determined in part by the nature of the solvent. A wide range of noncovalent interactions are observed in the various complexes, with the dominant interaction being hydrogen bonding and aromatic-aromatic stacking.
ABSTRACT. Inclusion complex between 3-amino-1,2,4-triazole picrate and β-cyclodextrin was synthesized in order to increase the picrate solubility. The complex was obtained by co-precipitation method and its stoichiometry is 1:1 (guest–host). The structure of picrate and complex has been established by UV, X-ray diffractometry powder spectra, TGA, DSC, IR, 1H NMR, and 13C NMR. The influence of the effect of pH on the complexation has been discussed. The value of apparent formation constant is 1.2 x 104.
KEY WORDS: Amino triazole, Picrate, Inclusion complex, pH
Bull. Chem. Soc. Ethiop. 2023, 37(4), 973-982.
DOI: https://dx.doi.org/10.4314/bcse.v37i4.13
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