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Experimental data for OH- (hydroxide anion)

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INChI INChIKey SMILES IUPAC name
InChI=1S/HO/h1H/q+1 MSCUNRCIQGLERU-UHFFFAOYSA-N [OH+]
State Conformation
3Σ C*V
Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp)
Property Value Uncertainty units Reference Comment
Hfg(298.15K) enthalpy of formation 1290.34 5.00 kJ mol-1 Gurvich
Hfg(0K) enthalpy of formation 1284.11 5.00 kJ mol-1 Gurvich
Entropy (298.15K) entropy 182.74   J K-1 mol-1 Gurvich
Integrated Heat Capacity (0 to 298.15K) integrated heat capacity 8.60   kJ mol-1 Gurvich
Heat Capacity (298.15K) heat capacity 29.20   J K-1 mol-1 Gurvich
Information can also be found for this species in the NIST Chemistry Webbook
Vibrational levels (cm-1) vibrations
Mode Number Symmetry Frequency Intensity Comment Description
Fundamental(cm-1) Harmonic(cm-1) Reference (km mol-1) unc. Reference
1 Σ 2956 3113 1979HUB/HER       wexe=78.515

Detailed diatomic data
ωe ωexe ωeye Be αe ZPE reference
3113.37 78.52 16.7943 0.7494 1541.181 2007Iri:389

vibrational zero-point energy: 1478.2 cm-1 (from fundamental vibrations)
Calculated vibrational frequencies for OH- (hydroxide anion).
Rotational Constants (cm-1) rotational constants
See section I.F.4 to change rotational constant units
A B C reference comment
  16.79430   Gurvich alpha=0.749

Calculated rotational constants for OH- (hydroxide anion).
Product of moments of inertia moments of inertia
1.003771amu Å2   1.666831E-40gm cm2
Geometric Data
picture of hydroxide anion

Point Group C∞v


Internal coordinates
distances (r) in Å, angles (a) in degrees, dihedrals (d) in degrees
Description Value unc. Connectivity Reference Comment
Atom 1 Atom 2 Atom 3 Atom 4
rOH 1.029   1 2 Gurvich

Cartesians
Atom x (Å) y (Å) z (Å)
O1 0.0000 0.0000 0.0000
H2 0.0000 0.0000 1.0289

Atom - Atom Distances bond lengths
Distances in Å
  O1 H2
O1   1.0289
H2 1.0289  

Calculated geometries for OH- (hydroxide anion).

Bond descriptions


Examples: C-C single bond, C=C, double bond, C#C triple bond, C:C aromatic bond
Bond Type Count
H-O 1

Connectivity
Atom 1 Atom 2
O1 H2
Electronic energy levels (cm-1)
Energy (cm-1) Degeneracy reference description
0 3   3Σ
28438.55 6 1975Mer/Mal:251 3Π
29058.8 1 1975Mer/Mal:251 1Σ
Dipole, Quadrupole and Polarizability
Electric dipole moment dipole
State Config State description Conf description Exp. min. Dipole (Debye) Reference comment Point Group Components
x y z total dipole quadrupole
1 1 3Σ C∞v True           C∞v 1 1
2 1 3Π C∞v True           C∞v 1 1
3 1 1Σ C∞v True           C∞v 1 1
Experimental dipole measurement abbreviations: MW microwave; DT Dielectric with Temperature variation; DR Indirect (usually an upper limit); MB Molecular beam
Calculated electric dipole moments for OH- (hydroxide anion).
Electric quadrupole moment quadrupole
State Config State description Conf description Exp. min. Quadrupole (D Å) Reference comment Point Group Components
xx yy zz dipole quadrupole
1 1 3Σ C∞v True       C∞v 1 1
2 1 3Π C∞v True       C∞v 1 1
3 1 1Σ C∞v True       C∞v 1 1

Calculated electric quadrupole moments for OH- (hydroxide anion).

References
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squib reference DOI
1975Mer/Mal:251 AJ Merer, DN Malm, RW Martin "The Ultraviolet Emission Spectra of OH+ and OD+. Rotational Structure and Perturbations in the A 3PIi-X 3SIGMA- Transition" Can. J. Physics 53(3) 1975 251-283 10.1139/p75-037
1979HUB/HER Huber, K.P.; Herzberg, G., Molecular Spectra and Molecular Structure. IV. Constants of Diatomic Molecules, Van Nostrand Reinhold Co., 1979 10.1007/978-1-4757-0961-2
2007Iri:389 KK Irikura "Experimental Vibrational Zero-Point Energies: Diatomic Molecules" J. Phys. Chem. Ref. Data 36(2), 389, 2007 10.1063/1.2436891
Gurvich Gurvich, L.V.; Veyts, I. V.; Alcock, C. B., Thermodynamic Properties of Individual Substances, Fouth Edition, Hemisphere Pub. Co., New York, 1989  

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