Molecule
- Name
- Ammonium ion
- IUPAC name
- Ammonium
- Secondary names
- Ammonium cation, Ammonium(1+), azanium, NH4+
- InChI
- InChI=1S/H3N/h1H3/p+1
- InChI key
- QGZKDVFQNNGYKY-UHFFFAOYSA-O
- CAS number
- 14798-03-9
- Formula
- $NH_4^+$
- Chemical formula
- NH4+
- Structural formula
- [NH4+]
- Charge
- 1
- Isotope mixture type
- terrestrial abundance
- Spin type
- equilibrated
- Molar mass
- 18.039 $g/mol$
- Protic
- protic
- Polarity
- ionic
- Molecule symmetry
- Td
- Case
- spherical-top
- Vibrations number
- 4
- Vibrations
-
Label Mode Bond Symmetry Degeneracy Fundamental frequency Observed frequency Observed frequency Harmonic frequency Activity IR Activity Raman Strength Comments V1 stretching sym. $NH_4^+$ $A_{1}$ no inactive active V2 deformation $NH_4^+$ $E$ double inactive active V3 stretching $NH_4^+$ $F_{2}$ triple 3335.8 active active vs 3357.5 cm^{-1} in Ne matrix V4 deformation $NH_4^+$ $F_{2}$ triple 1447.2 active inactive vs 1442.5 cm^{-1} in Ne matrix - Comments
- from NIST WebBook