Crown Ethers Analogues and their Complexes with NaSCN: Stoichiometry and Stability Constants Determined by 13C NMR Spectroscopy |
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| Authors: | A. M. Alstanei C. Bendic M. Carles J. P. Aycard |
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| Affiliation: | (1) Department of Physical Chemistry, Faculty of Chemistry, University of Bucharest, 4–12 Elisabeta Blv., Bucharest, Romania;(2) Laboratory of Spectroscopy and Molecular Dynamics, UMR 6633, case 542, University of Provence, Aix-Marseille I, 13397 Marseille, Cedex 20, France |
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| Abstract: | 13C NMR spectroscopy was used to study thecomplexation reaction between sodium ion and12-crown-4, 15-crown-5, methylurazolyl-12-crown-4 andmethylurazolyl-15-crown-5 in CD3OD solutions. Thetype of complexes, the stability constants and therelative chemical shifts have been established byfitting experimental titration curves with theoreticalfunctions of the observed chemical shifts. Thesingle-crystal X-ray diffraction measurements for anew crystalline complex confirmed the stoichiometry ofthe complex. |
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| Keywords: | crown ethers analogues 12-crown-4 15-crown-5 Na+ ion complex stability 13C NMR X-ray diffraction |
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