Abstract
The reaction of an aqueous suspension of basic cobalt carbonate CoCO3·4Co(OH)2·3H2O with equimolar amount or two-fold excess of 1-hydroxyethylydenediphosphonic acid (H4L) has yielded crystalline CoH2L and amorphous Co(H3L)2 products, respectively. The interaction of poorly soluble CoH2L complex with 2-aminoethanol has resulted in the formation of amorphous water-soluble CoH2L·H2NCH2CH2OH·6Н2О complex; the latter loses 5 water molecules at heating and is converted into CoH2L·H2NCH2CH2OH·Н2О. The study of agrochemical effects of Co(H3L)2 and CoH2L·H2NCH2CH2OH·6Н2О 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.
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