INTRAMOLECULAR HYDROGEN-BONDS IN POLYAMINOPOLYCARBOXYLIC ACIDS AND THEIR ROLE IN FORMATION OF COMPLEXES WITH METALS

Data on the shift of signals of H-1, C-13 and N-15 nuclei under protonation of polyaminopolycarboxylic acids with regard for all the basic contributions to a chemical shift are analyzed. Information is obtained on the structure of mono- and diprotonated forms of polyaminopolycarboxylic acids in water solutions. Structures of polyaminopolycarboxylic acids in the crystals and solutions have been compared. It is shown that proton forming intramolecular hydrogen bonds, combines all the donor groups of a complexon to a single co-ordination node and creates a matrix on which a complex of metals is formed.