Structural characterization of two salts derived from tetrafluorophthalic acid and isopropylamine
| Autor: | Markus Pietsch, Gregor Schnakenburg, Michael Gütschow, Wilfried Hoffbauer, Hans-Georg Häcker, Martin Nieger |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
chemistry.chemical_classification
010405 organic chemistry Carbon-13 NMR satellite Chemistry Hydrogen bond Organic Chemistry Nuclear magnetic resonance spectroscopy Carbon-13 NMR 010402 general chemistry 01 natural sciences 0104 chemical sciences Analytical Chemistry Inorganic Chemistry Crystallography chemistry.chemical_compound Molecule Acid salt Carboxylate Isopropylamine Spectroscopy |
| Zdroj: | Journal of Molecular Structure. 878:131-138 |
| ISSN: | 0022-2860 |
| DOI: | 10.1016/j.molstruc.2007.07.044 |
| Popis: | An anomalous acid salt ( 2 ) in the 2:1 ratio of tetrafluorophthalic acid and isopropylamine was prepared from bis(isopropylammonium) tetrafluorophthalate ( 1 ). Both salts were characterized by 13 C NMR spectroscopy in solution and in solid state, as well as X-ray crystallography. Crystallographic data revealed that molecules of 2 contain a tetrafluorophthalic acid component and a tetrafluorohydrogenphthalate unit. The geometrical arrangement in the crystal structure of 2 can be attributed to a network of intermolecular N–H···O, O–H···O, and C–H···O hydrogen bonds. Fluorine atoms were not involved in such interactions. The 13 C NMR chemical shifts of solutions 1 and 2 , as well as tetrafluorophthalic acid are discussed. In case of the salt 2 , only four different signals were observed for the aromatic and CO carbons and thus, all carboxyl/carboxylate groups appear to be equivalent in solution. In the solid-state NMR spectrum of 2 , a splitting into three resonances arising from the ipso -carbons was observed, in agreement with the anomalous acid salt structure. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect