Solid phase
Official name
amorphous Acetonitrile
Secondary names
Acetonitrile-am; amorphous-CH3CN
CAS number
75-05-8
Type
Family
molecular solid
Class
polar molecular solid
Compound type
nitrile
Chemical composition
Formula
amorphous$-CH_3CN$
Chemical formula
CH3CN
Elemental formula
C2 H3 N
Isotope mixture type
terrestrial abundance
2.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$CH_3CN$ Acetonitrile molecule 1 1.0 1 pure main
Chemical functions
  Function Number
$R-CH_3$ 1
$R-C \equiv N$ 1
Chemical bonds
  Bond Number
$\geq N \dots H-$ 2
$\geq C-H$ 3
$\equiv C-C\leq$ 1
$-C\equiv N$ 1
Class
molecular solids with polar molecules (02)
Type
with polyatomic organic polar molecules (CnHm...) (02.01)
Group
hydrocarbon with pnictogens (02.01.04)
Polymorphs
Phase name
amorphous-acetonitrile
Phase type
amorphous
Crystal system
amorphous
Molar mass
41.053 $g/mol$
Density
0.778 @ 15K $g/cm^3$
State NTP
liquid
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-gas gas by condensation below ~100K (~ -170°C)
solid-solid to beta-CH3CN above ~100-110 K (-173°C)
Phase transitions comments
beta-CH3CN is the high temperature phase but the one formed upon crystallization of amorphous ice (kinetically metastable phase).
Refringence type
isotropic
Refraction index $n_{\alpha}$
1.334 @ 15K
Pure color
colorless
Color
colorless
Diaphaneity
translucent
Luster
vitreous
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