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copper(I) oxide

chemical compound
Class type of: copper oxide Q407709

Facts

20 properties
Instance of
type of chemical entity
Subclass of
copper oxide[5]
Boiling point
+2073.15[17]
Canonical SMILES
[O-2].[Cu+].[Cu+], O=[Cu].[Cu][2][3]
Chemical formula
Cu₂O[4]
Color
red brown[6]
Crystal system
cubic crystal system[7]
Decomposition point
+1800[18]
Density
+6.0[12]
Described by source
Meyers Konversations-Lexikon, 4th edition (1885–1890)[11]
Has part(s) of the class
oxygen, copper[19][20]
Mass
+141.854, +141.85410962[14][15]
Melting point
+1244[16]
Molar fusion enthalpy
+64.22[13]
Point group
cubic-hexoctahedral[8]
Refractive index
+2.85[10]
Safety classification and labelling
NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response[25]
Space group
space group Pn-3m[9]
Standard enthalpy of formation
-112.0, -170.71[23][24]
Standard molar entropy
+129.96, +92.37[21][22]
🏷️ Also known as
en cuprous oxide en copper(I) oxide ar أكسيد النحاس الأحادي ar أكسيد نحاس أحادي ar Copper(I) oxide ar Cu2O cs Kysličník měďný cs Cu2O cs Oxid měďný da Kobber(I)oxid de Dikupferoxid de Kupfer(I)-oxid de Kupferoxydul de Cupro-oxyd de Cu2O es oxido de cobre es oxido cuproso es óxido cuproso es óxido de cobre (I) es óxido de cobre(I)
🔖 Identifiers · 31
CAS Registry Number
1317-39-1
COD ID
9007497
ChEBI ID
81908
ChemSpider ID
8488659, 11677287
CosIng number
89200
DSSTOX compound identifier
DTXCID401324398
DSSTox substance ID
DTXSID0034489
EC number
215-270-7
ECHA Substance Infocard ID
100.013.883
Encyclopædia Britannica Online ID
science/cuprous-oxide
Freebase ID
/m/02k0yw
Great Norwegian Encyclopedia ID
kopper(I)oksid
Show all 31 identifiers +19
HCIS ID
1319
HSDB ID
1549
ICSC ID
0421
InChI
InChI=1S/2Cu.O/q2*+1;-2, InChI=1S/2Cu.O
InChIKey
KRFJLUBVMFXRPN-UHFFFAOYSA-N, BERDEBHAJNAUOM-UHFFFAOYSA-N
KBpedia ID
CopperIOxide
KEGG ID
C18714
Microsoft Academic ID (discontinued)
2777051278
NSC number
83538
PDB ligand ID
C2O
PDB structure ID
3GYR, 1KV7, 1GSK, 1BT1, 1BT3, 1BT2, 1AOZ, 3PAU, 2ZWN, 2P3X, 2YXW, 2YXV, 2FQG, 2FQF, 2FQE, 2FQD, 3G5W, 3AW5, 3NSY
PesticideInfo chemical ID
PRI2245
PubChem CID
10313194, 18346908
RTECS number
GL8050000
RxNorm CUI
21842
SureChEMBL ID
2710
UNII
T8BEA5064F
UniChem compound ID
1074185
ZVG number
4790

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🔗 Connections
Has part(s) 2
oxygen, copper
Belongs to 1
cuprite
Crystal system 1
cubic crystal system
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Summary

copper(I) oxide is a type of chemical entity[1].

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.
  2. [3] ↑ . wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.
  5. [6] ↑ . wikidata.org.
  6. [7] ↑ . wikidata.org.
  7. [8] ↑ . wikidata.org.
  8. [9] ↑ . wikidata.org.
  9. [10] ↑ . wikidata.org.
  10. [11] ↑ . wikidata.org.
  11. [12] ↑ . wikidata.org.
  12. [13] ↑ . wikidata.org.
  13. [14] ↑ . wikidata.org.
  14. [15] ↑ . wikidata.org.
  15. [16] ↑ . wikidata.org.
  16. [17] ↑ . wikidata.org.
  17. [18] ↑ . wikidata.org.
  18. [19] ↑ . wikidata.org.
  19. [20] ↑ . wikidata.org.
  20. [21] ↑ . wikidata.org.
  21. [22] ↑ . wikidata.org.
  22. [23] ↑ . wikidata.org.
  23. [24] ↑ . wikidata.org.
  24. [25] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). copper(I) oxide. Retrieved November 11, 2026, from https://4ort.xyz/entity/copper-i-oxide
MLA “copper(I) oxide.” 4ort.xyz Knowledge Graph, 4ort.xyz, 11 Nov. 2026, https://4ort.xyz/entity/copper-i-oxide.
BibTeX @misc{4ortxyz_copper-i-oxide_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{copper(I) oxide}}, year = {2026}, url = {https://4ort.xyz/entity/copper-i-oxide}, note = {Accessed: 2026-11-11}}
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Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 6w ago · KrBot bot · 2026-09-26 view diff on Wikidata ↗
    ZVG number → 4790
    "Changed claim: ZVG number: 4790, см. / see autofix на / on P679"
  2. 7w ago · Mrwdat3 · 2026-09-23 view diff on Wikidata ↗
    Has part(s) → —
    ZVG number → 4790
    Standard enthalpy of formation → -112, -170.71
    Has part(s) of the class → oxygen, copper
    + 2 other properties edited (see Wikidata diff for full list)
    "Created claim: ZVG number: 004790, batch #275042"
  3. 11w ago · Baum64 · 2026-08-23 view diff on Wikidata ↗
    Has part(s) → —
    Has part(s) of the class → oxygen, copper
    "Created claim: Has part(s) of the class: oxygen, batch #269324"
  4. 12w ago · Baum64 · 2026-08-18 view diff on Wikidata ↗
    COD ID → 9007497
    Space group → space group Pn-3m
    Boiling point → 2,073.15
    "Created claim: COD ID: 9007497, batch #269136"
  5. 21w ago · Nabbegat · 2026-06-19 view diff on Wikidata ↗
    Density → 6
    Color → red brown
    Decomposition point → 1,800
    Instance of → type of chemical entity
    + 13 other properties edited (see Wikidata diff for full list)
    "Changed [tr] labels, descriptions or aliases: QuickStatements 3.0 batch #37300"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.