in water FeSO4 and phenanthroline reacted in a 1:3 stoichiometric relationship;

FeS:1,10-phenanthroline, molar ratio 1:3;

in water 1,10-phenanthroline added in 1,10-phenanthroline:Fe ratio of ca. 3:1 todeaerated Fe(2+) soln.;

potassium cyanide in water Fe salt aq. soln. heating nearly boiling, aq. KCN adding at once, stirring, cooling to room temp., dark violet crystals collecting, drying in vacuo; identified by IR, UV spectra;