solid alpha-Methanol | SSHADE

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Solid phase

Official name: solid alpha-Methanol

Name and identifiers

Secondary names: CH3OH ice; alpha CH3OH

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 and bonds

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)

Crystallography

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)

Physical properties

Molar mass: 32.0412 $g/mol$
Density: 0.82 $\pm$ 0.02 $g/cm^3$

Thermodynamical properties

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

Optical properties

Refringence type: biaxial
Refraction index $n_{\alpha}$: 1.343 $\pm$ 0.004
Pure color: colorless
Diaphaneity: transparent
Luster: vitreous

Links and Publications

Links

Wikipedia: Methanol