Chemical Properties of dl-Cysteine (CAS 3374-22-9)

InChI

InChI=1S/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)

InChI Key

XUJNEKJLAYXESH-UHFFFAOYSA-N

Formula

C3H7NO2S

SMILES

NC(CS)C(=O)O

Molecular Weight¹

121.16

CAS

3374-22-9

Other Names

• Cysteine, L-
• «beta»-Mercaptoalanine
• Cystein
• Cysteine
• Half-cystine
• L-(+)-Cysteine
• L-Alanine, 3-mercapto-
• NSC-8746
• Propanoic Acid, 2-amino-3-mercapto-, (R)-
• Thioserine
• (R)-2-Amino-3-mercaptopropanoic acid
• «alpha»-Amino-«beta»-thiolpropionic acid
• (R)-Cysteine
• 2-Amino-3-mercaptopropionic acid
• L-Cys
• L-HSCH2CH(NH2)COOH
• Cysteine, DL-

• PAff : Proton affinity (kJ/mol).
• BasG : Gas basicity (kJ/mol).
• Δ_cH°_solid : Standard solid enthalpy of combustion (kJ/mol).
• C_p,gas : Ideal gas heat capacity (J/mol×K).
• C_p,solid : Solid phase heat capacity (J/mol×K).
• Δ_fG° : Standard Gibbs free energy of formation (kJ/mol).
• Δ_fH°_gas : Enthalpy of formation at standard conditions (kJ/mol).
• Δ_fH°_solid : Solid phase enthalpy of formation at standard conditions (kJ/mol).
• Δ_fusH° : Enthalpy of fusion at standard conditions (kJ/mol).
• Δ_vapH° : Enthalpy of vaporization at standard conditions (kJ/mol).
• IE : Ionization energy (eV).
• log₁₀WS : Log10 of Water solubility in mol/l.
• logP_oct/wat : Octanol/Water partition coefficient.
• McVol : McGowan's characteristic volume (ml/mol).
• P_c : Critical Pressure (kPa).
• S°_{solid,1 bar} : Solid phase molar entropy at standard conditions (J/mol×K).
• T_boil : Normal Boiling Point Temperature (K).
• T_c : Critical Temperature (K).
• T_fus : Normal melting (fusion) point (K).
• V_c : Critical Volume (m³/kmol).
• ¹: Molecular weight from the IUPAC atomic weights tables.

Physical Properties

Property	Value	Unit	Source
PAff	903.20	kJ/mol	NIST
BasG	869.30	kJ/mol	NIST
ΔcH°solid	[-2267.70; -2229.00]	kJ/mol
ΔcH°solid	-2248.84 ± 0.55	kJ/mol	NIST
ΔcH°solid	-2267.70 ± 2.10	kJ/mol	NIST
ΔcH°solid	-2248.90 ± 2.10	kJ/mol	NIST
ΔcH°solid	-2229.00 ± 3.00	kJ/mol	NIST
ΔfG°	-197.96	kJ/mol	Joback Calculated Property
ΔfH°gas	-303.07	kJ/mol	Joback Calculated Property
ΔfH°solid	[-567.40; -534.08]	kJ/mol
ΔfH°solid	-534.08 ± 0.62	kJ/mol	NIST
ΔfH°solid	-567.40	kJ/mol	NIST
ΔfusH°	14.93	kJ/mol	Joback Calculated Property
ΔvapH°	62.69	kJ/mol	Joback Calculated Property
IE	[9.00; 9.50]	eV
IE	9.50	eV	NIST
IE	9.00	eV	NIST
log10WS	0.20		Crippen Calculated Property
logPoct/wat	-0.672		Crippen Calculated Property
McVol	86.900	ml/mol	McGowan Calculated Property
Pc	6696.65	kPa	Joback Calculated Property
S°solid,1 bar	169.90	J/mol×K	NIST
Tboil	549.04	K	Joback Calculated Property
Tc	760.31	K	Joback Calculated Property
Tfus	339.04	K	Joback Calculated Property
Vc	0.305	m3/kmol	Joback Calculated Property

Temperature Dependent Properties

Property	Value	Unit	Temperature (K)	Source
Cp,gas	[187.08; 219.90]	J/mol×K	[549.04; 760.31]
Cp,gas	187.08	J/mol×K	549.04	Joback Calculated Property
Cp,gas	193.43	J/mol×K	584.25	Joback Calculated Property
Cp,gas	199.41	J/mol×K	619.46	Joback Calculated Property
Cp,gas	205.04	J/mol×K	654.67	Joback Calculated Property
Cp,gas	210.32	J/mol×K	689.89	Joback Calculated Property
Cp,gas	215.27	J/mol×K	725.10	Joback Calculated Property
Cp,gas	219.90	J/mol×K	760.31	Joback Calculated Property
Cp,solid	162.30	J/mol×K	297.60	NIST

Similar Compounds

Find more compounds similar to dl-Cysteine.

Sources

• Crippen Method
• Crippen Method
• Joback Method
• McGowan Method
• NIST Webbook

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