Cyclopentane, 1,2-dimethyl-, trans-
- Formula: C7H14
- Molecular weight: 98.1861
- IUPAC Standard InChIKey: RIRARCHMRDHZAR-BQBZGAKWSA-N
- CAS Registry Number: 822-50-4
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Stereoisomers:
- Other names: trans-1,2-Dimethylcyclopentane; 1,trans-2-Dimethylcyclopentane; 1,2-Dimethylcyclopentane, trans; t-1,2-Dimethylcyclopentane; (E)-1,2-Dimethylcyclopentane; Cyclopentane, 1,2-dimethyl-
- Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
- Other data available:
- Options:
Data at NIST subscription sites:
NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.
Phase change data
Go To: Top, IR Spectrum, Mass spectrum (electron ionization), References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
DRB - Donald R. Burgess, Jr.
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 365.0 ± 0.1 | K | AVG | N/A | Average of 14 out of 15 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 155. ± 2. | K | AVG | N/A | Average of 7 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 154.1 | K | N/A | Huffman, Parks, et al., 1931 | Uncertainty assigned by TRC = 0.2 K; TRC |
Ttriple | 154.2 | K | N/A | Parks and Huffman, 1931 | Uncertainty assigned by TRC = 0.1 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 34.6 | kJ/mol | N/A | Reid, 1972 | AC |
ΔvapH° | 34.6 | kJ/mol | N/A | Johnson, Prosen, et al., 1949 | DRB |
Enthalpy of vaporization
ΔvapH (kJ/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
34.2 | 310. | A | Stephenson and Malanowski, 1987 | Based on data from 295. to 367. K.; AC |
34.0 | 314. | N/A | Forziati, Norris, et al., 1949 | Based on data from 299. to 366. K.; AC |
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (bar)
T = temperature (K)
View plot Requires a JavaScript / HTML 5 canvas capable browser.
Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
299.26 to 365.92 | 3.96059 | 1237.866 | -52.023 | Forziati, Norris, et al., 1949, 2 | Coefficents calculated by NIST from author's data. |
IR Spectrum
Go To: Top, Phase change data, Mass spectrum (electron ionization), 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: Coblentz Society, Inc.
Condensed Phase Spectrum
Notice: This spectrum may be better viewed with a Javascript and HTML 5 enabled browser.
Notice: Except where noted, spectra from this collection were measured on dispersive instruments, often in carefully selected solvents, and hence may differ in detail from measurements on FTIR instruments or in other chemical environments. More information on the manner in which spectra in this collection were collected can be found here.
Notice: Concentration information is not available for this spectrum and, therefore, molar absorptivity values cannot be derived.
Additional Data
View scan of original (hardcopy) spectrum.
View image of digitized spectrum (can be printed in landscape orientation).
View spectrum image in SVG format.
Download spectrum in JCAMP-DX format.
Owner | COBLENTZ SOCIETY Collection (C) 2018 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
---|---|
Origin | DOW CHEMICAL COMPANY |
Source reference | COBLENTZ NO. 10328 |
Date | 1963/11/14 |
Name(s) | 1,2-dimethylcyclopentane |
State | SOLUTION (10% IN CCl4 FOR 3800-1333, 10% IN CS2 FOR 1333-400 CM-1) |
Instrument | DOW KBr FOREPRISM-GRATING |
Instrument parameters | BLAZED AT 3.5, 12.0, 20.0 MICRON, CHANGED AT 5.0, 7.5, 14.9 MICRON |
Path length | 0.010, 0.010 CM SPECTRAL CONTAMINATION DUE TO CCl4 AROUND 1550 CM-1 SPECTRAL CONTAMINATION DUE TO CS2 AROUND 860 CM-1 HAS BEEN REMOVED |
Resolution | 4 |
Sampling procedure | TRANSMISSION |
Data processing | DIGITIZED BY NIST FROM HARD COPY (FROM TWO SEGMENTS) |
Mass spectrum (electron ionization)
Go To: Top, Phase change data, IR Spectrum, 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: NIST Mass Spectrometry Data Center, William E. Wallace, director
Spectrum
Notice: This spectrum may be better viewed with a Javascript and HTML 5 enabled browser.
Additional Data
View image of digitized spectrum (can be printed in landscape orientation).
Due to licensing restrictions, this spectrum cannot be downloaded.
Owner | NIST Mass Spectrometry Data Center Collection (C) 2014 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. |
---|---|
NIST MS number | 937 |
References
Go To: Top, Phase change data, IR Spectrum, Mass spectrum (electron ionization), Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Huffman, Parks, et al., 1931
Huffman, H.M.; Parks, G.S.; Barmore, M.,
Thermal Data on Organic Compounds X. Further Studies on the Heat Capacities, Entropies, and Free Energies of Hydrocarbons,
J. Am. Chem. Soc., 1931, 53, 3876-88. [all data]
Parks and Huffman, 1931
Parks, G.S.; Huffman, H.M.,
Some fusion and transition data for hydrocarbons,
Ind. Eng. Chem., 1931, 23, 1138-9. [all data]
Reid, 1972
Reid, Robert C.,
Handbook on vapor pressure and heats of vaporization of hydrocarbons and related compounds, R. C. Wilhort and B. J. Zwolinski, Texas A Research Foundation. College Station, Texas(1971). 329 pages.$10.00,
AIChE J., 1972, 18, 6, 1278-1278, https://doi.org/10.1002/aic.690180637
. [all data]
Johnson, Prosen, et al., 1949
Johnson, W.H.; Prosen, E.J.; Rossini, F.D.,
Heats of combustion and isomerization of the six C7H14 alkylcyclopentanes,
J. Res. NBS, 1949, 42, 251-255. [all data]
Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw,
Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2
. [all data]
Forziati, Norris, et al., 1949
Forziati, Alphonse F.; Norris, William R.; Rossini, Frederick D.,
Vapor pressures and boiling points of sixty API-NBS hydrocarbons,
J. RES. NATL. BUR. STAN., 1949, 43, 6, 555-17, https://doi.org/10.6028/jres.043.050
. [all data]
Forziati, Norris, et al., 1949, 2
Forziati, A.F.; Norris, W.R.; Rossini, F.D.,
Vapor Pressures and Boiling Points of Sixty API-NBS Hydrocarbons,
J. Res. Natl. Bur. Stand. (U.S.), 1949, 43, 6, 555-563, https://doi.org/10.6028/jres.043.050
. [all data]
Notes
Go To: Top, Phase change data, IR Spectrum, Mass spectrum (electron ionization), References
- Symbols used in this document:
Tboil Boiling point Tfus Fusion (melting) point Ttriple Triple point temperature ΔvapH Enthalpy of vaporization ΔvapH° Enthalpy of vaporization 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.