Abstract
The potential use of merocyanine dye (1-(12-hydroxydodecyl)-4-[(3-hydroxy-4-oxocyclohexa-2,5-dienylidene)-ethylidene]-1,4-dihydropyridine) was investigated as an effective monitoring tool for the presence of free iron ions. We show that merocyanine forms stable complexes with both Fe2+ and Fe3+ ions provided that the pH level is maintained at 10. Only the basic form of merocyanine was capable of forming these complexes. Complexes between merocyanine and iron ions demonstrated some features of charge-transfer complexes and did not dissociate in the presence of water.
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