Amino-substitutedgem-diphosphonic acids: Dissociation mechanism and the structure of species in aqueous solutions |
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| Authors: | A G Matveeva M P Pasechnik P V Petrovskii S V Matveev S A Pisareva |
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| Institution: | (1) A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 ul. Vavilova, 117813 Moscow, Russian Federation |
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| Abstract: | The mechanism of dissociation of amino-substitutedgem-diphosphonic acids R2N(CH2)
n
CR'(PO3H2)2 with different lengths of the alkylidene chain and different substituents at the N atom was studied by vibrational (IR, Raman)
and NMR (1H,14N,31P) spectroscopy using data of conformational analysis (molecular mechanical) data. The important role of intramolecular H-bonds
and cyclic solvates for the stabilization of various conformations and tautomeric forms of ions was demonstrated. The spectral
data that allow one to consider thegem-diphosphonate group as a single acidic center were found.
Translated fromIzvestiya Akademii Nauk Seriya Khimicheskaya, No. 6, pp. 1051–1064, June, 2000. |
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| Keywords: | ω -aminoalkylidenediphosphonic acids gem-diphosphonates dissociation mechanism IR Raman and1H 14N and31P NMR spectra conformational analysis hydrogen bonds |
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