Halide ion effect on the chloroform chemical shift in supramolecular complexation studies with tetra-n-butylammonium salts: a 1H NMR and X-ray study |
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| Authors: | Hisham Fathy Sleem Louise Nicole Dawe Shofiur Rahman |
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| Affiliation: | Department of Chemistry, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador, Canada A1B 3X |
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| Abstract: | A 1H NMR spectroscopic study of tetra-n-butylammonium halides (TBAX: X = Cl? , Br? or I? ) in CDCl3 solutions was conducted. Complexation studies of TBAX salts with different host molecules using 1H NMR in CDCl3 have previously revealed that the reference residual CHCl3 proton signal had been shifted downfield. The aim of the study was to quantify the extent of these chemical shift changes with TBAX salts. Linear concentration–chemical shift relationships in each case were obtained from the resulting titration plots obtained from the addition of the TBAX salts alone to CDCl3. Interactions in the solid state as determined by X-ray crystallography support the solution-state investigations indicating halide ion–chloroform proton interactions. |
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| Keywords: | host–guest complexation tetrabutylammonium halides association constants 1H NMR titrations X-ray crystallography |
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