Manganese complexes 8-hydroxyquinoline

H. 8-Hydroxyquinaldine (XI). The reactions of 8-hydroxyquinaldine are, in general, similar to 8-hydroxyquinoline described under (C) above, but unlike the latter it does not produce an insoluble complex with aluminium. In acetic acid-acetate solution precipitates are formed with bismuth, cadmium, copper, iron(II) and iron(III), chromium, manganese, nickel, silver, zinc, titanium (Ti02 + ), molybdate, tungstate, and vanadate. The same ions are precipitated in ammoniacal solution with the exception of molybdate, tungstate, and vanadate, but with the addition of lead, calcium, strontium, and magnesium aluminium is not precipitated, but tartrate must be added to prevent the separation of aluminium hydroxide. 

Dithizone (in the presence of pyridine or phen as synergistic agents) forms an extractable (CCI4) complex with manganese (e = 5.7-10 at 510 nm) [39 2]. Manganese can also be determined with HTTA (e = 6.1-10 at 420 nm) [43,44] and 8-hydroxyquinoline (extraction in the presence of quaternary bases) [45]. 

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