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Optical constants of C4H9OH (Butanol)
Wang et al. 2018: n-Butanol, 90 °C; n,k 1.66–19.1 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Conditions & Spec sheet

n_is_absolute: true
wavelength_is_vacuum: true
temperature: 90.0 °C


n-butanol, 90 °C.


C. C. Wang, J. Y. Tan, C. Y. Jing, L. H. Liu. Temperature-dependent optical constants of liquid isopropanol, n-butanol and n-decane, Appl. Opt. 57, 3303-3311 (2018) (Numerical data kindly provided by Chengchao Wang)


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Butanol, C4H10O

Butanol (C4H10O) refers to a group of four isomeric alcohol compounds with a four-carbon structure. The isomers include n-butanol (or 1-butanol), isobutanol (or 2-methyl-1-propanol), sec-butanol (or 2-butanol), and tert-butanol (or 2-methyl-2-propanol). Of these, n-butanol is the most commonly referred to when discussing "butanol." Butanol is a colorless liquid at room temperature with a characteristic alcoholic odor. It is moderately soluble in water but is very soluble in most organic solvents. It's utilized in a wide variety of applications, including as a solvent in the manufacturing of resins, plasticizers, and other chemicals. It's also employed in the formulation of paints, coatings, varnishes, and inks. In addition, butanol is considered a potential biofuel, as it can be produced from biomass sources and has properties comparable to gasoline.

Chemical formula

  • n-Butanol: CH3(CH2)3OH or C4H9OH
  • sec-Butanol: CH3CH(OH)CH2CH3
  • Isobutanol: (CH3)2CHCH2OH
  • tert-Butanol: (CH3)3COH

Other names

Butyl alcohol
n-Butanol sec-Butanol Isobutanol tert-Butanol
  • Butan-1-ol
  • Butalcohol
  • Butanol
  • 1-Butanol
  • Butyl alcohol
  • Butyl hydrate
  • Butylic alcohol
  • Butyralcohol
  • Butyric alcohol
  • Butyryl alcohol
  • Hydroxybutane
  • Propylcarbinol
  • Butan-2-ol
  • 2-Butanol
  • sec-Butyl alcohol
  • 2-Butyl alcohol
  • 2-Methylpropan-1-ol
  • Isobutyl alcohol
  • IBA
  • 2-Methyl-1-propanol
  • 1-Propanol, 2-methyl-
  • 2-Methylpropyl alcohol
  • tert-Butyl alcohol (TBA)
  • 2-Methylpropan-2-ol
  • 2-Methyl-2-propanol (2M2P)
  • 2-Propanol, 2-methyl-

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