1-Nitroso-2-naphthol

Chemical compound From Wikipedia, the free encyclopedia

1-Nitroso-2-naphthol is an organic compound with the formula C10H6(NO)OH. It is one of several possible nitrosonaphthols, and the most studied for applications as an indicator and a dye.[2]

Quick facts Names, Identifiers ...
1-Nitroso-2-naphthol
Names
Preferred IUPAC name
1-Nitrosonaphthalen-2-ol
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.004.586 Edit this at Wikidata
EC Number
  • 205-043-0
UNII
  • InChI=1S/C10H7NO2/c12-9-6-5-7-3-1-2-4-8(7)10(9)11-13/h1-6,12H
    Key: YXAOOTNFFAQIPZ-UHFFFAOYSA-N
  • C1=CC=C2C(=C1)C=CC(=C2N=O)O
Properties
C10H7NO2
Molar mass 173.171 g·mol−1
Appearance Yellowish-brown
Melting point 109.5 Â°C (229.1 Â°F; 382.6 K)
Hazards
GHS labelling:[1]
GHS07: Exclamation markGHS09: Environmental hazard
Warning
H302, H315, H319, H335, H400
P261, P264, P264+P265, P270, P271, P273, P280, P301+P317, P302+P352, P304+P340, P305+P351+P338, P319, P321, P330, P332+P317, P337+P317, P362+P364, P391, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 Â°C [77 Â°F], 100 kPa).
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Synthesis and reactions

1-Nitroso-2-naphthol can be prepared by treatment of 2-naphthol with nitrous acid:[3]

C10H7OH + HNO2 → C10H6(NO)OH + H2O

Its conjugate base forms deeply colored complexes with iron(II) and cobalt(II), complexes [M(C10H6(NO)O)3]2-.[4] The deep colors of these complexes results from the delocalized bonding within each five-membered chelate ring. These species can be classified as nitroso complexes.

See also

  • Naphthol Green B, the iron complex of a sulfonated derivative of 1-nitroso-2-naphthol

References

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