Magneson
Title: Magneson
CAS Registry Number: 74-39-5
CAS Name: 4-[(4-Nitrophenyl)azo]-1,3-benzenediol
Additional Names: 4-(p-nitrophenylazo)resorcinol; 2,4-dihydroxy-4ยข-nitroazobenzene
Molecular Formula: C12H9N3O4
Molecular Weight: 259.22
Percent Composition: C 55.60%, H 3.50%, N 16.21%, O 24.69%
Literature References: Ref: Suitzu, Okuma, J. Soc. Chem. Ind. Jpn. 29, 132 (1926); Ruigh, J. Am. Chem. Soc. 51, 1456 (1929); Engel, ibid. 52, 1812 (1930).
Properties: Brownish-red powder. Practically insol in water; sol in dil aq NaOH.
Use: For the detection of magnesium with which it yields a bright blue color in alkaline soln. Also used to determine molybdenum with which it forms a red-violet complex: Nikitina, Andrianova, C.A. 75, 136789v (1971).

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