Hydroquinone Formula : C6H6O2

Molecular weight : 110.1106 IUPAC Standard InChI: 

o InChI=1S/C6H6O2/c7-5-1-2-6(8)4-3-5/h1-4,7-8H

o Download the identifier in a file .

IUPAC Standard InChIKey: QIGBRXMKCJKVMJ-UHFFFAOYSA-N CAS Registry Number: 123-31-9

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.

Other names: 1,4-Benzenediol; p-Benzenediol; p-Dihydroxybenzene; p-Dioxybenzene; p-Hydroquinone; p-Hydroxyphenol; Arctuvin; Benzohydroquinone; Benzoquinol; Diak 5; Eldopaque; Eldoquin; Hidroquinone; Hydroquinol; HE 5; Phiaquin; Quinol; Tecquinol; Tenox HQ; 1,4-Dihydroxybenzene; 4-Hydroxyphenol; p-Dioxobenzene; Hydrochinone; Benzene, p-dihydroxy-; Black and White Bleaching Cream; Derma-Blanch; Hydrochinon; Hydroquinole; Idrochinone; NCI-C55834; Tequinol; USAF EK-356; 1,4-Dihydroxy-benzeen; 1,4-Dihydroxy-benzol; 1,4-Dihydroxybenzen; 1,4-Diidrobenzene; UN 2662; Dihydroquinone; Aida; Eldopacque; Eldopaque forte; Eldoquin forte; Solaquin forte; p-Dihydroquinone; Black & White Bleaching Cream; 1,4-Benzenediol (hydroquinone)

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Information on this page:o Phase change data o References o Notes / Error Report

Other data available:o Gas phase thermochemistry data o Condensed phase thermochemistry data o Reaction thermochemistry data o Henry's Law data o Gas phase ion energetics data o IR Spectrum

o Mass spectrum (electron ionization) o UV/Visible spectrum o Gas Chromatography

Data at other public NIST sites:o X-ray Photoelectron Spectroscopy Database, version 4.1

Options:o Switch to calorie-based units

Data at NIST subscription sites:

NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data)

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Phase change data

Go To: Top, References, Notes / Error Report

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 - R.L. Brown and S.E. SteinTRC - Thermodynamics Research Center, NIST Boulder Laboratories, M. Frenkel directorAC - W.E. Acree, Jr., J.S. ChickosALS - H.Y. Afeefy, J.F. Liebman, and S.E. SteinDRB - D.R. BurgessDH - E.S. Domalski and E.D. Hearing

Quantity Value Units Method Reference Comment

Tboil 558.2 K N/AAldrich Chemical Company Inc., 1990

BS

Tboil 558.2 K N/AKrupatkin and Rozhentsova, 1971

Uncertainty assigned by TRC = 1. K; TRC

Quantity Value Units Method Reference Comment

Tfus 445.0 K N/ABret-Dibat and Lichanot, 1989

Crystal phase 1 phase; Uncertainty assigned by TRC = 0.6 K; TRC

Tfus 445. K N/A Buckingham and Donaghy, 1982 BS

Tfus 443.5 K N/AKrupatkin and Rozhentsova, 1971

Uncertainty assigned by TRC = 0.3 K; TRC

Quantity Value Units Method Reference Comment

Ttriple 445.98 K N/A Sabbah and Buluku, 1991

Uncertainty assigned by TRC = 0.03 K; TRC

Ttriple 445.5 K N/A Andrews, Lynn, et al., 1926

Uncertainty assigned by TRC = 0.3 K; obtained from cooling curve in absence of air; TRC

Quantity Value Units Method Reference Comment

ΔvapH° 84.4 ± 0.7 kJ/mol N/A Verevkin and Kozlova, 2008 AC

Quantity Value Units Method Reference Comment

ΔsubH° 94.13 ± 0.53 kJ/mol CSabbah and Buluku, 1991, 2

ΔHfusion =21.09±0.4 kJ/mol; ALS

ΔsubH° 94.1 kJ/mol N/A Sabbah and Buluku, 1991, 2 DRB

ΔsubH° 94.1 ± 0.5 kJ/mol CSabbah and Buluku, 1991, 2 AC

ΔsubH° 99.2 ± 1.7 kJ/mol C Magnus, 1956Reanalyzed by Cox and Pilcher, 1970, Original value = 104. kJ/mol; ALS

ΔsubH° 103.76 kJ/mol VCoolidge and Coolidge, 1927 ALS

Reduced pressure boiling point

Tboil (K) Pressure (bar) Reference Comment

558.2 0.973 Weast and Grasselli, 1989 BS

558. 0.973 Buckingham and Donaghy, 1982 BS

Enthalpy of vaporization

ΔvapH (kJ/mol) Temperature (K) Method Reference Comment

70.5 448. - 559. A Stephenson and Malanowski, 1987 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

432.3 - 559. 5.8947 3049.481 -40.485 von Terres, Gebert, et al., 1955

Coefficents calculated by NIST from author's data.

Enthalpy of sublimation

ΔsubH (kJ/mol) Temperature (K) Method Reference Comment

100.6 ± 1.3 325. - 339. N/A Chen, Oja, et al., 2006 AC

93.7 ± 0.5 334. C Sabbah and Buluku, 1991, 2 AC

101.3 341. - 400. GS Bender, Bieling, et al., 1983 AC

104. ± 1. 342. ME,TE de Kruif, 1981 AC

103.8 298. - 346. N/A Magnus, 1956 AC

99. ± 2. 351. V Wolf and Weghofer, 1938 ALS

103.8 326. - 345. QF Coolidge and Coolidge, 1927 AC

Enthalpy of fusion

ΔfusH (kJ/mol) Temperature (K) Method Reference Comment

26.500 444.95 N/A Bret-Dibat and Lichanot, 1989, 2 DH

27.23 445.1 N/A Verevkin and Kozlova, 2008 AC

26.48 453. N/A Bret-Dibat and Lichanot, 1989, 2 AC

27.110 445.5 N/A Andrews, Lynn, et al., 1926, 2 DH

27.11 445.1 C Andrews, Lynn, et al., 1926, 2 AC

Entropy of fusion

ΔfusS (J/mol*K) Temperature (K) Reference Comment

59. 444.95 Bret-Dibat and Lichanot, 1989, 2 DH

60.9 445.5 Andrews, Lynn, et al., 1926, 2 DH

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