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
C4H2
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
C4H2 Diacetylene molecule 1 1.0 1 pure main
Chemical functions
  Function Number
R−C≡C−R 1
Chemical bonds
  Bond Number
≡C…H− 2
≡C−C≡ 1
−C≡C− 2
≡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 nα
1.419 (liquid 5°C)
Pure color
colorless
Diaphaneity
transparent
Luster
vitreous
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