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Tris-HCl

Athanor · official

C4H12ClNO3 · 157.59 g/mol

IUPAC name: 2-amino-2-(hydroxymethyl)propane-1,3-diol;hydrochloride

Also called Tris hydrochloride, tris buffer, THAM hydrochloride

Reagents
Open in Athanor
The structure of Tris-HCl
Drawn from its SMILES with RDKit
Harmful or irritantWarningCauses skin irritation · Causes serious eye irritation · May cause respiratory irritation

Names and identifiers

IUPAC name
2-amino-2-(hydroxymethyl)propane-1,3-diol;hydrochloride
Synonyms
Tris hydrochloride, tris buffer, THAM hydrochloride
+ 36 more

Tris(hydroxymethyl)aminomethane hydrochloride, Tromethamine hydrochloride, 2-Amino-2-(hydroxymethyl)propane-1,3-diol hydrochloride, TRIS HCl, Trometamol hydrochloride, Trizma hydrochloride, Tromethamine HCl, 1,3-Propanediol, 2-amino-2-(hydroxymethyl)-, hydrochloride, Tris chloride, DTXSID4044373, Tris hydrochloride buffer, UNII-383V75M34E, EINECS 214-684-5, 383V75M34E, 2-Amino-2-hydroxymethyl-1,3-propanediol hydrochloride, DTXCID2024373, TROMETAMOL HYDROCHLORIDE [WHO-DD], 1,3-Propanediol, 2-amino-2-(hydroxymethyl)-, hydrochloride (1:1), RefChem:192247, 2Amino2hydroxymethyl1,3propanediol hydrochloride, 2Amino2(hydroxymethyl)propane1,3diol hydrochloride, 1,3Propanediol, 2amino2(hydroxymethyl), hydrochloride, 2-Amino-2-(hydroxymethyl)-1,3-propanediol Hydrochloride, MFCD00012590, Trometamol (hydrochloride), tri(hydroxymethyl) amino methane hydrochloride, Tromethamine (hydrochloride), Tri(hydroxymethyl)aminomethane hydrochloride, M02622, 2-amino-2-(hydroxymethyl)propane-1,3-diol;hydrochloride, Trometamol, Tromethamine, Tris-[hydroxymethyl]aminomethane, Tromethamol, Tromethamine, Tris-[hydroxymethyl]aminomethane, C4H12ClNO3, Trizma(R) hydrochloride, Tris(hydroxymethyl)aminomethane hydrochloride(Tris HCl), Trishydrochloride

Molecular formula
C4H12ClNO3
Empirical formula
C4H12ClNO3
Molecular weight
157.59 g/mol
Exact mass
157.05057
CAS number
1185-53-1
PubChem CID
93573
Canonical SMILES
C(C(CO)(CO)N)O.Cl
Isomeric SMILES
C(C(CO)(CO)N)O.Cl
InChI
InChI=1S/C4H11NO3.ClH/c5-4(1-6,2-7)3-8;/h6-8H,1-3,5H2;1H
InChIKey
QKNYBSVHEMOAJP-UHFFFAOYSA-N
Molfile

Names, InChI and the identifiers from PubChem, retrieved 2026-10-14.

Physical properties

Appearance
Dry Powder; Liquid; Other Solid; Dry Powder[1]

Each value as its source reports it, with the source's number after it (listed under References). Where several sources report a property, the row shows the value most of them agree on, the rule the app uses; open the values to see every one.

Calculated

Heavy atoms
9
Rings
0
Aromatic rings
0
Fraction sp³ carbons (Fsp3)
1
H-bond donors
4 computed here · PubChem 5
H-bond acceptors
4
Rotatable bonds
3
TPSA (Ų)
86.7
Formal charge
0
Complexity
54 PubChem
Stereocenters
None
Double-bond geometry
None specified
Point group
C1 of one 3D conformer with its hydrogens, by Athanor’s engine (as in the app)

Elemental analysis

  • C30.49%
  • H7.68%
  • Cl22.50%
  • N8.89%
  • O30.46%

Isotope pattern

100%157.0515.0%158.05433%159.0481.6%160.051161.052

Each peak is a nominal mass with its abundance-weighted exact mass, as a percentage of the tallest, from IUPAC natural isotope abundances.

Computed from the structure with RDKit 2026.09 when this page was built, beside PubChem's own computed values from its record; where the two differ, both are shown.

Predicted

log P
-1.92 Crippen (Wildman and Crippen 1999)
log S (water solubility)
0.59 ESOL (Delaney 2004), log mol/L
Synthetic accessibility
3.33 SA score, 1 easy to 10 hard (Ertl and Schuffenhauer 2009)

Drug-likeness: Lipinski’s rule of five

  • Molecular weight ≤ 500: 157.6
  • log P ≤ 5 (Crippen): -1.92
  • H-bond donors ≤ 5: 4
  • H-bond acceptors ≤ 10: 4

Passes all four rules.

¹³C NMR shifts, predicted

Predictions, not measurements; each names its method. A measured log P, where a source reports one, is under Physical properties.

Safety

Warning

Most widely reported: 180 company reports to ECHA. Source [2].

  • Harmful or irritant
  • H315Causes skin irritation (42.2% of reports)
  • H319Causes serious eye irritation (42.2% of reports)
  • H335May cause respiratory irritation (40.6% of reports)

Precautionary statements: P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, P501

View all classifications (2)
  • [2] European Chemicals Agency (ECHA)This chemical does not meet GHS hazard criteria for 57.2% (103 of 180) of all reports.
  • [2] European Chemicals Agency (ECHA) · 180 reports · WarningH315, H319, H335

Safety data sheets on the supplier’s page: Fluorochem, Finetech Industry Limited, Thermo Fisher Scientific.

Always read the supplier’s safety data sheet before working with it.

Spectra

Experimental spectra held by these sources; each link opens the source's own record.

Literature

Reading PubChem, OpenAlex and GSRS…

Bioactivity

Reading ChEMBL…

References

  1. [1]EPA Chemical Data Reporting (CDR) · Public domain (US EPA) · via PubChem · retrieved 2026-10-14
  2. [2]European Chemicals Agency (ECHA) · ECHA legal notice: reuse with acknowledgement · via PubChem · retrieved 2026-10-14
  3. [3]SpectraBase · Linked only · via PubChem · retrieved 2026-10-14
  4. ·Calculated values: computed by Athanor with RDKit 2026.09 from the structure.
  5. ·Literature on PubChem

Data last updated 2026-10-14.