chromium
- Formula: Cr
- Molecular weight: 51.9961
- IUPAC Standard InChI: InChI=1S/Cr
- IUPAC Standard InChIKey: VYZAMTAEIAYCRO-UHFFFAOYSA-N
- CAS Registry Number: 7440-47-3
- Chemical structure:
This structure is also available as a 2d Mol file - Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
- Other data available:
- Data at other public NIST sites:
- NIST Atomic Spectra Database - Lines Holdings (on physics web site)
- NIST Atomic Spectra Database - Levels Holdings (on physics web site)
- NIST Atomic Spectra Database - Ground states and ionization energies (on physics web site)
- Gas Phase Kinetics Database
- X-ray Photoelectron Spectroscopy Database, version 5.0
- Options:
Ion clustering data
Go To: Top, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Michael M. Meot-Ner (Mautner) and Sharon G. Lias
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.
Clustering reactions
+
= (
•
)
By formula: Cr+ + Cr = (Cr+ • Cr)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 150. ± 20. | kJ/mol | ICRCD | Houriet and Vulpius, 1989 | gas phase |
| ΔrH° | 180. | kJ/mol | EI | Hilpert and Ruthardt, 1987 | gas phase; from IP(Cr2) by EI and D(Cr2) by Knudsen cell, and IP(Cr) |
| ΔrH° | 180. ± 20. | kJ/mol | KC-MS | Hilpert and Ruthardt, 1987 | gas phase; data as evaluated by Houriet and Vulpius, 1989 |
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 125. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( •
) +
= (
• 2
)
By formula: (Cr+ • Cr) + Cr = (Cr+ • 2Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 194. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 2
) +
= (
• 3
)
By formula: (Cr+ • 2Cr) + Cr = (Cr+ • 3Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 100. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 3
) +
= (
• 4
)
By formula: (Cr+ • 3Cr) + Cr = (Cr+ • 4Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 215. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 4
) +
= (
• 5
)
By formula: (Cr+ • 4Cr) + Cr = (Cr+ • 5Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 171. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 5
) +
= (
• 6
)
By formula: (Cr+ • 5Cr) + Cr = (Cr+ • 6Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 246. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 6
) +
= (
• 7
)
By formula: (Cr+ • 6Cr) + Cr = (Cr+ • 7Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 217. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 7
) +
= (
• 8
)
By formula: (Cr+ • 7Cr) + Cr = (Cr+ • 8Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 249. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 8
) +
= (
• 9
)
By formula: (Cr+ • 8Cr) + Cr = (Cr+ • 9Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 232. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 9
) +
= (
• 10
)
By formula: (Cr+ • 9Cr) + Cr = (Cr+ • 10Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 248. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 10
) +
= (
• 11
)
By formula: (Cr+ • 10Cr) + Cr = (Cr+ • 11Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 258. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 11
) +
= (
• 12
)
By formula: (Cr+ • 11Cr) + Cr = (Cr+ • 12Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 289. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 12
) +
= (
• 13
)
By formula: (Cr+ • 12Cr) + Cr = (Cr+ • 13Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 294. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 13
) +
= (
• 14
)
By formula: (Cr+ • 13Cr) + Cr = (Cr+ • 14Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 267. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 14
) +
= (
• 15
)
By formula: (Cr+ • 14Cr) + Cr = (Cr+ • 15Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 282. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 15
) +
= (
• 16
)
By formula: (Cr+ • 15Cr) + Cr = (Cr+ • 16Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 273. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 16
) +
= (
• 17
)
By formula: (Cr+ • 16Cr) + Cr = (Cr+ • 17Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 208. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 17
) +
= (
• 18
)
By formula: (Cr+ • 17Cr) + Cr = (Cr+ • 18Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 233. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 18
) +
= (
• 19
)
By formula: (Cr+ • 18Cr) + Cr = (Cr+ • 19Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 289. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
( • 19
) +
= (
• 20
)
By formula: (Cr+ • 19Cr) + Cr = (Cr+ • 20Cr)
Enthalpy of reaction
| ΔrH° (kJ/mol) | T (K) | Method | Reference | Comment |
|---|---|---|---|---|
| 253. | CID | Armentrout and Kickel, 1994 | gas phase; guided ion beam CID |
References
Go To: Top, Ion clustering data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Houriet and Vulpius, 1989
Houriet, R.; Vulpius, T.,
Formation of Metal Cluster Ions by Gas - Phase Ion - Molecule Reactions: the Bond Energies of Cr2+ and Mn2+,
Chem. Phys. Lett., 1989, 154, 5, 454, https://doi.org/10.1016/0009-2614(89)87130-1
. [all data]
Hilpert and Ruthardt, 1987
Hilpert, K.; Ruthardt, K.,
Determination of the dissociation energy of the Cr2 molecule,
Ber. Bunsen-Ges. Phys. Chem., 1987, 91, 724. [all data]
Armentrout and Kickel, 1994
Armentrout, P.B.; Kickel, B.L.,
Gas Phase Thermochemistry of Transition Metal Ligand Systems: Reassessment of Values and Periodic Trends, in Organometallic Ion Chemistry, B. S. Freiser, ed, 1994. [all data]
Notes
Go To: Top, Ion clustering data, References
- Symbols used in this document:
T Temperature ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
- The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
- Customer support for NIST Standard Reference Data products.