Water-Soluble Cobalt Complexes with 1-Hydroxyethylydenediphosphonic Acid and 2-Aminoethanol

摘要

The reaction of an aqueous suspension of basic cobalt carbonate CoCO3.4Co(OH)(2).3H(2)O 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.6H(2)O complex; the latter loses 5 water molecules at heating and is converted into CoH2L.H2NCH2CH2OH.H2O. The study of agrochemical effects of Co(H3L)(2) and CoH2L.H2NCH2CH2OH.6H(2)O 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.