Dicyandiamide

Formula: C₂H₄N₄
Molecular weight: 84.0800
IUPAC Standard InChI: InChI=1S/C2H4N4/c3-1-6-2(4)5/h(H4,4,5,6)
IUPAC Standard InChIKey: QGBSISYHAICWAH-UHFFFAOYSA-N
CAS Registry Number: 461-58-5
Chemical structure:
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Other names: Guanidine, cyano-; Cyanoguanidine; Dicyanodiamide; N-Cyanoguanidine; Pyroset DO; 1-Cyanoguanidine; 2-Cyanoguanidine; Guanidine-1-carbonitrile; NCN=C(NH2)2; Dicyanediamide; Dicyandiamin; ACR-H 3636; Araldite HT 986; Araldite XB 2879B; Araldite XB 2979B; Bakelite VE 2560; Epicure DICY 15; Epicure DICY 7; Guanidine, N-cyano-; NSC 2031; XB 2879B
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Condensed phase thermochemistry data

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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
Δ_fH°_solid	21.3 ± 2.0	kJ/mol	Ccb	Medard and Thomas, 1952	Reanalyzed by Cox and Pilcher, 1970, Original value = 23.3 kJ/mol; Author's hf291_condensed=4.5 kcal/mol; ALS
Δ_fH°_solid	24.9	kJ/mol	Ccb	Salley and Gray, 1951	correction of Salley and Gray, 1948; ALS
Quantity	Value	Units	Method	Reference	Comment
Δ_cH°_solid	-1377.63	kJ/mol	Ccb	Handrick, 1956	ALS
Δ_cH°_solid	-1379.9 ± 2.0	kJ/mol	Ccb	Medard and Thomas, 1952	Reanalyzed by Cox and Pilcher, 1970, Original value = -1382. kJ/mol; Author's hf291_condensed=4.5 kcal/mol; ALS
Δ_cH°_solid	-1383.6	kJ/mol	Ccb	Salley and Gray, 1951	correction of Salley and Gray, 1948; ALS
Quantity	Value	Units	Method	Reference	Comment
S°_{solid,1 bar}	129.29	J/mol*K	N/A	Stephenson and Berets, 1952	DH

Constant pressure heat capacity of solid

C_p,solid (J/mol*K)	Temperature (K)	Reference	Comment
142.	340.	David, 1964	T = 298 to 373 K. Mean value. T = uncertain.; DH
117.74	294.63	Stephenson and Berets, 1952	T = 15 to 300 K. Value is unsmoothed experimental datum.; DH

References

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Medard and Thomas, 1952
Medard, L.; Thomas, M., Determination des chaleurs de combustion de douze composes organiques utilises dans les poudres et enplosies, Mem. Poudres, 1952, 34, 421-442. [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]

Salley and Gray, 1951
Salley, D.J.; Gray, J.B., Heats of combustion of some organic nitrogen compounds, J. Am. Chem. Soc., 1951, 73, 5925. [all data]

Salley and Gray, 1948
Salley, D.J.; Gray, J.B., Heats of combustion of some organic nitrogen compounds, J. Am. Chem. Soc., 1948, 70, 2650-2653. [all data]

Handrick, 1956
Handrick, G.R., Report of the study of pure explosive compounds. Part IV. Calculation of heat of combustion of organic compounds from structural features and calculation of power of high explosives, Rpt. C-58247 for the Office of the Chief of Ordnance, contract DA-19-020-ORD-47 by the Arthur D. Little, Inc., Cambridge, MA, 1956, 467-573. [all data]

Stephenson and Berets, 1952
Stephenson, C.C.; Berets, D.J., The heat capacities and entropies of melamine and dicyandiamide, J. Am. Chem. Soc., 1952, 74, 882-883. [all data]

David, 1964
David, D.J., Determination of specific heat and heat of fusion by differential thermal analysis. Study of theory and operating parameters, Anal. Chem., 1964, 36, 2162-2166. [all data]

Notes

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Symbols used in this document:

C_p,solid	Constant pressure heat capacity of solid
S°_{solid,1 bar}	Entropy of solid at standard conditions (1 bar)
Δ_cH°_solid	Enthalpy of combustion of solid at standard conditions
Δ_fH°_solid	Enthalpy of formation of solid at standard conditions

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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