Advanced Organic Chemistry: Infrared spectrum of propan-2-amine

SITEMAP * HOME PAGE * SEARCH * GCSE Level Chemistry age ~14-16 * Advanced Level Chemistry age ~16-19

Interpreting the infrared spectrum of propan-2-amine (2-aminopropane, 2-propanamine, 2-propylamine, isopropylamine)

Doc Brown's Chemistry Advanced Level Pre-University Chemistry Revision Study Notes for UK IB KS5 A/AS GCE advanced A level organic chemistry students US K12 grade 11 grade 12 organic chemistry courses involving molecular spectroscopy analysing infrared spectra of propan-2-amine (2-aminopropane)

email doc brown

Use your mobile phone or ipad etc. in 'landscape' mode

This is a BIG website, you need to take time to explore it

Infrared spectroscopy - spectra index

infrared spectrum of propan-2-amine (2-aminopropane) C3H9N (CH3)2CHNH2 wavenumbers cm-1 functional group detection fingerprint pattern identification of isopropylamine 2-propylamine 2-propanamine doc brown's advanced organic chemistry revision notes 

Spectra obtained from a liquid film of propan-2-amine (2-aminopropane). The right-hand part of the of the infrared spectrum of propan-2-amine (2-aminopropane), wavenumbers ~1500 to 400 cm-1 is considered the fingerprint region for the identification of propan-2-amine (2-aminopropane) and most organic compounds. It is due to a unique set of complex overlapping vibrations of the atoms of the molecule of propan-2-amine (2-aminopropane) - a primary aliphatic amine.

propan-2-amine, 2-aminopropane, 2-propylamine, 2-propanamine, isopropylamine, (c) doc b, (c) doc b

Interpretation of the infrared spectrum of propan-2-amine (2-aminopropane)

The most prominent infrared absorption lines of propan-2-amine (2-aminopropane)

At wavenumbers ~3500 to 3300 cm-1 is a broad band for N-H bond stretching vibrations,  characteristic of amines.

Primary amines have a highly polar bond (δ-N-Hδ+) and the intermolecular forces are increased by permanent dipole - permanent dipole attractions including hydrogen bonding (N-Hδ+llllδ-N-H) between the propan-2-amine molecules (diagram below).

The hydrogen bonding interferes with the N-H stretching vibrations producing the broad band peaking at around ~3400 cm-1.

hydrogen bonding in aliphatic amines stronger intermolecular force bonds bonding higher boiling points compared to alkanes with no hydrogen bonding

Around 3000 to 2800 cm-1 are absorptions due to C-H stretching vibrations - they overlap with the N-H stretching vibrations of propan-2-amine.

There are also characteristic bands due to N-H vibrations at wavenumbers ~1650 to 1580 cm-1, often sharp, so do not confuse with the C=O vibrations from carbonyl compounds.

Absorption due to C-N vibrations, characteristic of C-N bonds in aliphatic amines like propan-2-amine occur at 1250 to 1020 cm-1.

There are other N-H vibration absorptions at wavenumbers ~910 to 665 cm-1,

The absence of other specific functional group bands will show that a particular functional group is absent from the propan-2-amine (2-aminopropane) molecular structure.

Key words & phrases: isomer of C3H9N (CH3)2CHNH2 image and diagram explaining the infrared spectrum of propan-2-amine (2-aminopropane), complete infrared absorption spectrum of propan-2-amine (2-aminopropane), comparative spectra of propan-2-amine (2-aminopropane), prominent peaks/troughs for identifying functional groups in the infrared spectrum of propan-2-amine (2-aminopropane), important wavenumber values in cm-1 for peaks/troughs in the infrared spectrum of propan-2-amine (2-aminopropane), revision of infrared spectroscopy of propan-2-amine (2-aminopropane), fingerprint region analysis of propan-2-amine (2-aminopropane), how to identify propan-2-amine (2-aminopropane) from its infrared spectrum, identifying organic compounds like propan-2-amine (2-aminopropane) from their infrared spectrum, how to analyse the absorption bands in the infrared spectrum of propan-2-amine (2-aminopropane) detection of functional groups in the propan-2-amine (2-aminopropane) molecule example of the infrared spectrum of a molecule like propan-2-amine (2-aminopropane) with a functional group  interpreting interpretation of the infrared spectrum of propan-2-amine (2-aminopropane) shows presence of functional group primary aliphatic amine isopropylamine 2-propylamine 2-propanamine

Links associated with propan-2-amine (2-aminopropane)

The chemistry of ORGANIC NITROGEN COMPOUNDS revision notes INDEX

Infrared spectroscopy index

ALL SPECTROSCOPY INDEXES

All Advanced Organic Chemistry Notes

Use My Google search site box

Email doc b: chem55555@hotmail.com

TOP OF PAGE