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Cyclopentane, 1,2-dimethyl-, trans-

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Gas phase thermochemistry data

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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:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow

Quantity Value Units Method Reference Comment
Deltafgas-136.7 ± 1.3kJ/molCmJohnson, Prosen, et al., 1949ALS

Constant pressure heat capacity of gas

Cp,gas (J/mol*K) Temperature (K) Reference Comment
44.5150.Thermodynamics Research Center, 1997p=1 bar. Recommended values are in close agreement with those calculated by a method of increments [ Epstein M.B., 1949] at low temperatures. Discrepancies increase up to 2-4 J/mol*K at T=1500 K.; GT
61.44100.
76.91150.
93.09200.
122.9273.15
134.5298.15
135.4300.
182.7400.
225.4500.
261.1600.
290.9700.
316.0800.
337.4900.
355.61000.
371.31100.
384.81200.
396.51300.
406.51400.
415.31500.
432.51750.
445.02000.
454.22250.
461.12500.
466.52750.
470.73000.

Condensed phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Quantity Value Units Method Reference Comment
Deltafliquid-171.3 ± 1.2kJ/molCmJohnson, Prosen, et al., 1949 
Quantity Value Units Method Reference Comment
Deltacliquid-4584.2 ± 1.1kJ/molCmJohnson, Prosen, et al., 1949Corresponding «DELTA»fliquid = -171.2 kJ/mol (simple calculation by NIST; no Washburn corrections)

Phase change data

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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
Tboil365.0 ± 0.1KAVGN/AAverage of 14 out of 15 values; Individual data points
Quantity Value Units Method Reference Comment
Tfus155. ± 2.KAVGN/AAverage of 7 values; Individual data points
Quantity Value Units Method Reference Comment
Ttriple154.1KN/AHuffman, Parks, et al., 1931Uncertainty assigned by TRC = 0.2 K; TRC
Ttriple154.2KN/AParks and Huffman, 1931Uncertainty assigned by TRC = 0.1 K; TRC
Quantity Value Units Method Reference Comment
Deltavap34.6kJ/molN/AReid, 1972AC
Deltavap34.6kJ/molN/AJohnson, Prosen, et al., 1949DRB

Enthalpy of vaporization

DeltavapH (kJ/mol) Temperature (K) Method Reference Comment
34.2310.AStephenson and Malanowski, 1987Based on data from 295. - 367. K.; AC
34.0314.N/AForziati, Norris, et al., 1949Based on data from 299. - 366. K.; AC

Antoine Equation Parameters

log10(P) = A − (B / (T + C))
    P = vapor pressure (bar)
    T = temperature (K)

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Temperature (K) A B C Reference Comment
299.26 - 365.923.960591237.866-52.023Forziati, Norris, et al., 1949, 2Coefficents calculated by NIST from author's data.

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:


Reaction thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

2Hydrogen + 2Cyclopentene, 1,2-dimethyl- = Cyclopentane, 1,2-dimethyl-, cis- + Cyclopentane, 1,2-dimethyl-, trans-

By formula: 2H2 + 2C7H12 = C7H14 + C7H14

Quantity Value Units Method Reference Comment
Deltar-94.35 ± 0.75kJ/molChydAllinger, Dodziuk, et al., 1982liquid phase; solvent: Hexane

2Hydrogen + Cyclopentane,1,2-bis(methylene)- = Cyclopentane, 1,2-dimethyl-, trans-

By formula: 2H2 + C7H10 = C7H14

Quantity Value Units Method Reference Comment
Deltar-231. ± 0.8kJ/molChydRoth, Adamczak, et al., 1991liquid phase

IR Spectrum

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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

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IR spectrum
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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

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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)

This IR spectrum is from the Coblentz Society's evaluated infrared reference spectra collection.


Mass spectrum (electron ionization)

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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

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Mass spectrum
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Additional Data

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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

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References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry 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.

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]

Thermodynamics Research Center, 1997
Thermodynamics Research Center, Selected Values of Properties of Chemical Compounds., Thermodynamics Research Center, Texas A&M University, College Station, Texas, 1997. [all data]

Epstein M.B., 1949
Epstein M.B., Heats, equilibrium constants, and free energies of formation of the dimethylcyclopentanes, J. Res. Nat. Bur. Stand., 1949, 43, 245-250. [all data]

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]

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]

Allinger, Dodziuk, et al., 1982
Allinger, N.L.; Dodziuk, H.; Rogers, D.W.; Naik, S.N., Heats of hydrogenation and formation of some 5-membered ring compounds by molecular mechanics calculations and direct measurements, Tetrahedron, 1982, 38, 1593-1597. [all data]

Roth, Adamczak, et al., 1991
Roth, W.R.; Adamczak, O.; Breuckmann, R.; Lennartz, H.-W.; Boese, R., Die Berechnung von Resonanzenergien; das MM2ERW-Kraftfeld, Chem. Ber., 1991, 124, 2499-2521. [all data]


Notes

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