Naphthalene, 2,3-dimethyl-

Formula: C₁₂H₁₂
Molecular weight: 156.2237
IUPAC Standard InChI: InChI=1S/C12H12/c1-9-7-11-5-3-4-6-12(11)8-10(9)2/h3-8H,1-2H3
IUPAC Standard InChIKey: WWGUMAYGTYQSGA-UHFFFAOYSA-N
CAS Registry Number: 581-40-8
Chemical structure:
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Other names: Guajen; 2,3-Dimethylnaphthalene
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Gas phase thermochemistry data

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Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DRB - Donald R. Burgess, Jr.
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow

Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_gas	18.2 ± 0.48	kcal/mol	Ccb	Colomina, Jimenez, et al., 1979	ALS
Δ_fH°_gas	19.1	kcal/mol	N/A	Good, 1973	Value computed using Δ_fH_solid° value of -2.3±1.1 kj/mol from Good, 1973 and Δ_subH° value of 82.2 kj/mol from Colomina, Jimenez, et al., 1979.; DRB

Constant pressure heat capacity of gas

C_p,gas (cal/mol*K)	Temperature (K)	Reference	Comment
10.1	50.	Thermodynamics Research Center, 1997	p=1 bar. Among all statistically calculated values of S(T) for methyl- and dimethylnaphthalenes [ Thermodynamics Research Center, 1997], only for 2,3-dimethylnaphthalene calculated values are substantially different from experimental ones.; GT
17.4	100.
24.31	150.
31.17	200.
41.42	273.15
44.93	298.15
45.20	300.
58.53	400.
69.98	500.
79.40	600.
87.14	700.
93.55	800.
98.95	900.
103.5	1000.
107.	1100.
111.	1200.
114.	1300.
116.	1400.
118.	1500.

References

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Colomina, Jimenez, et al., 1979
Colomina, M.; Jimenez, P.; Roux, M.V.; Turrion, C., Thermochemical properties of naphthalene derivatives. V. Formation enthalpies of 2,3-dimethylnaphthalene and 2,3-dihydroxynaphthalene, An. Quim., 1979, 75, 620-624. [all data]

Good, 1973
Good, W.D., The enthalpies of combustion and formation of 1,8-dimethylnaphthalene, 2,3-dimethylnaphthalene, 2,6-dimethylnaphthalene, and 2,7-dimethylnaphthalene, J. Chem. Thermodyn., 1973, 5, 715-720. [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]

Notes

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Symbols used in this document:

C_p,gas Constant pressure heat capacity of gas

Δ_fH°_gas Enthalpy of formation of gas at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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C_p,gas	Constant pressure heat capacity of gas
Δ_fH°_gas	Enthalpy of formation of gas at standard conditions