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Xanthine

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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 as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity Value Units Method Reference Comment
Deltafsolid-379.6 ± 0.92kJ/molCcbStiehler and Huffman, 1935Reanalyzed by Cox and Pilcher, 1970, Original value = -384.1 kJ/mol; ALS
Quantity Value Units Method Reference Comment
Deltacsolid-2159.7 ± 0.88kJ/molCcbStiehler and Huffman, 1935Reanalyzed by Cox and Pilcher, 1970, Original value = -2159.0 ± 1.5 kJ/mol; ALS
Quantity Value Units Method Reference Comment
solid,1 bar161.1J/mol*KN/AStiehler and Huffman, 1935, 2Extrapolation below 90 K, 48.87 J/mol*K.; DH

Constant pressure heat capacity of solid

Cp,solid (J/mol*K) Temperature (K) Reference Comment
151.34298.5Stiehler and Huffman, 1935, 2T = 85 to 299 K. Value is unsmoothed experimental datum.; DH

Gas phase ion energetics 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:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

Ionization energy determinations

IE (eV) Method Reference Comment
8.55PEDougherty, Younathan, et al., 1978LLK
9.3 ± 0.2EILifschitz, Bergmann, et al., 1967RDSH
8.89 ± 0.03PEHush and Cheung, 1975Vertical value; LLK

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 Copyright (C) 1987 by the 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 K. K. DEB-NCI FREDERICK CANCER RESEARCH CENTER
Source reference COBLENTZ NO. 9741
Date 1974/09/11
Name(s) PURINE-2,6(1H,3H)-DIONE
State SOLID (1.8 mg / 360 mg KBr DISC)
PURITY - ANALYTICAL
Instrument PERKIN-ELMER 180 (GRATING)
Instrument parameters GRATINGS: 2000, 1000, 500, 250 CM-1; FILTER CHANGE: 2970, 2000, 1485, 1000, 743, 500, 372, 250, 186 CM-1.
Resolution 2
Sampling procedure TRANSMISSION
Data processing DIGITIZED BY COBLENTZ SOCIETY (BATCH II) FROM HARD COPY

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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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.
Origin TNO Volatile Compounds in Food - Chemical Concepts
NIST MS number 249971

All mass spectra in this site (plus many more) are available from the NIST/EPA/NIH Mass Spectral Library. Please see the following for information about the library and its accompanying search program.


UV/Visible 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: Victor Talrose, Alexander N. Yermakov, Alexy A. Usov, Antonina A. Goncharova, Axlexander N. Leskin, Natalia A. Messineva, Natalia V. Trusova, Margarita V. Efimkina

Spectrum

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UVVis spectrum
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Additional Data

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Source Cavalieri and Brown, 1948
Owner INEP CP RAS, NIST OSRD
Collection (C) 2007 copyright by the U.S. Secretary of Commerce
on behalf of the United States of America. All rights reserved.
Origin INSTITUTE OF ENERGY PROBLEMS OF CHEMICAL PHYSICS, RAS
Source reference RAS UV No. 10759
Instrument Beckman DU
Melting point dec
Boiling point sub

References

Go To: Top, Condensed phase thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), UV/Visible spectrum, Notes

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

Stiehler and Huffman, 1935
Stiehler, R.D.; Huffman, H.M., Thermal data. IV. The heats of combustion of adenine, hypoxanthine, guanine, xanthine, uric acid, allantoin and alloxan, J. Am. Chem. Soc., 1935, 57, 1734-1740. [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

Stiehler and Huffman, 1935, 2
Stiehler, R.D.; Huffman, H.M., Thermal data. V. The heat capacities, entropies and free energies of adenine, hypoxanthine, guanine, xanthine, uric acid, allantoin and alloxan, J. Am. Chem. Soc., 1935, 57, 1741-1743. [all data]

Dougherty, Younathan, et al., 1978
Dougherty, D.; Younathan, E.S.; Voll, R.; Abdulnur, S.; McGlynn, S.P., Photoelectron spectroscopy of some biological molecules, J. Electron Spectrosc. Relat. Phenom., 1978, 13, 379. [all data]

Lifschitz, Bergmann, et al., 1967
Lifschitz, C.; Bergmann, E.D.; Pullman, B., The ionization potentials of biological purines and pyrimidines, Tetrahedron Lett., 1967, 4583. [all data]

Hush and Cheung, 1975
Hush, N.S.; Cheung, A.S., Ionization potentials and donor properties of nucleic acid bases and related compounds, Chem. Phys. Lett., 1975, 34, 11. [all data]

Cavalieri and Brown, 1948
Cavalieri, L.F.; Brown, G.B., J. Am. Chem. Soc., 1948, 70, 3875. [all data]


Notes

Go To: Top, Condensed phase thermochemistry data, Gas phase ion energetics data, IR Spectrum, Mass spectrum (electron ionization), UV/Visible spectrum, References