1-(2-Pyridylazo)-2-naphthol - 1-(2-Pyridylazo)-2-naphthol

Structural formula
Structural formula of 1- (2-pyridylazo) -2-naphthol
Name 1-(2-Pyridylazo)-2-naphthol
other names
  • PAN
  • Pyridylazonaphtol
Sum formula C 15 H 11 N 3 O
Brief description

orange-red amorphous solid, yellow in organic solvents [1]

External identifiers / databases
CAS number 85-85-8
EC number 201-637-9
ECHA-InfoCard 100.001.489
PubChem 5376264
Wikidata Q3596751
Molar mass 249.27 g · mol −1
Physical state


Melting point

138–141 °C[1]

safety instructions
GHS hazard labeling [1]
07 - Warning


H and P phrases H: 315​‐​319​‐​335
P: 261​‐​305+351+338 [1]
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

1- (2-Pyridylazo) -2-naphthol (PAN) is a chemical compound from the group of naphthols . PAN forms insoluble, red to green chelate complexes with many transition metals , so that these can be used for quantitative metal determination. PAN is a tridentate chelator.

Individual evidence

  1. a b c d data sheet 1- (2-pyridylazo) -2-naphthol, for spectrophotometric det. of metal ions, ≥97.0% from Sigma-Aldrich , accessed on October 21, 2013 ( PDF ).