Ammonium ion | SSHADE

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Molecule

Name: Ammonium ion

Name and identifiers

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

Structure and atomic composition

Formula: $NH_4^+$
Chemical formula: NH4+
Structural formula: [NH4+]
Charge: 1

	Atom	Name	Number
	$N^+$	Nitrogen cation	1
	$H$	Hydrogen	4

Isotopic composition

Isotope mixture type: terrestrial abundance

Nuclear spin isomers

Spin type: equilibrated

Molar mass: 18.039 $g/mol$
Protic: protic
Polarity: ionic

Fundamental vibration modes

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

Chemical functions and bonds

Chemical bonds

	Bond	Number
	$\geq N^+-H$	4