Water-soluble cobalt complexes with 1-hydroxyethylydenediphosphonic acid and 2-aminoethanol.

The reaction of an aqueous suspension of basic cobalt carbonate CoCO·4Co(OH)·3HO with equimolar amount or two-fold excess of 1-hydroxyethylydenediphosphonic acid (HL) has yielded crystalline CoHL and amorphous Co(HL) products, respectively. The interaction of poorly soluble CoHL complex with 2-aminoethanol has resulted in the formation of amorphous water-soluble CoHL·HNCHCHOH·6НО complex; the latter loses 5 water molecules at heating and is converted into CoHL·HNCHCHOH·НО. The study of agrochemical effects of Co(HL) and CoHL·HNCHCHOH·6НО has revealed their advantage over the conventional salt form (cobalt sulfate) reflected in the reduced phytotoxicity of the element. The prepared compound containing 2-aminoethanol (solubility promotor) has revealed better performance. [ABSTRACT FROM AUTHOR]