Solid phase
Official name
Diacetylene phase I
Secondary names
C4H2-I ice
Type
Family
molecular solid
Class
non polar molecular solid
Compound type
organic molecular solid
Chemical composition
Formula
$C_4H_2$
Chemical formula
C4H2
Elemental formula
C4 H2
Isotope mixture type
terrestrial abundance
2.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$C_4H_2$ Diacetylene molecule 1 1.0 1 pure main
Chemical functions
  Function Number
$R-C\equiv C-R$ 1
Chemical bonds
  Bond Number
$\equiv C \dots H-$ 2
$\equiv C-C \equiv$ 1
$-C\equiv C-$ 2
$\equiv C-H$ 2
Class
molecular solids with apolar molecules (01)
Type
with polyatomic organic apolar molecules (CnHm...) (01.06)
Phase name
C4H2 Phase I
Phase type
crystalline
Crystal system
orthorhombic
Crystal class
disphenoidal
Crystal class symbol
222 (D2)
Crystal spacegroup
P2(1)2(1)2
Comments
structure from Freund and Halford, 1965
Molar mass
50.060 $g/mol$
State NTP
gas
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-liquid liquid 237 K / -36°C
Refringence type
unknown
Refraction index $n_{\alpha}$
1.419 (liquid 5°C)
Pure color
colorless
Diaphaneity
transparent
Luster
vitreous
Links