Solid phase
Official name
solid alpha-Methanol
Secondary names
CH3OH ice; alpha CH3OH
Type
Family
molecular solid
Class
hydrogen bonded molecular solid
Compound type
organic molecular solid
Chemical composition
Formula
$CH_3OH$
Chemical formula
CH3OH
Elemental formula
C H4 O
Isotope mixture type
terrestrial abundance
2.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$CH_3OH$ Methanol molecule 1 1.0 1 pure main
Chemical functions
  Function Number
$R-OH$ 1
Chemical bonds
  Bond Number
$-O \dots H-$ 1
$\geq C-H$ 3
$\geq C-O-$ 1
$-O-H$ 1
Class
molecular solids with hydrogen bonded molecules (03)
Type
homomolecular H-bonded solids (03.01)
Phase name
$\alpha-CH_3OH$
Phase type
crystalline
Crystal system
orthorhombic
Crystal class
disphenoidal
Crystal class symbol
222 (D2)
Crystal spacegroup
P2(1)2(1)2(1)
Molar mass
32.0412 $g/mol$
Density
0.82 $\pm$ 0.02 $g/cm^3$
State NTP
liquid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-solid beta-CH3OH 157.36 K (-115.79°C)
solid-solid from amorphous CH3OH ~105-128K
Phase transitions comments
stable below 157.36. A metastable phase may exist between the alpha and beta phase from 155 to 165K
Refringence type
biaxial
Refraction index $n_{\alpha}$
1.343 $\pm$ 0.004
Pure color
colorless
Diaphaneity
transparent
Luster
vitreous
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