Amine
Alkylamine or aniline pK a of protonated amine K b
methylamine ( MeNH 2 ) 10.62 4.17E-04
dimethylamine ( Me 2 NH ) 10.64 4.37E-04
trimethylamine ( Me 3 N ) 9.76 5.75E-05
ethylamine ( EtNH 2 ) 10.63 4.27E-04
aniline ( PhNH 2 ) 4.62 4.17E-10
4-methoxyaniline ( 4-MeOC 6 H 4 NH 2 ) 5.36 2.29E-09
N , N-Dimethylaniline ( PhNMe 2 ) 5.07 1.17E-09
3-Nitroaniline ( 3-NO 2 -C 6 H 4 NH 2 ) 2.46 2.88E-12
4-Nitroaniline ( 4-NO 2 -C 6 H 4 NH 2 ) 1 1.00E-13
4-trifluoromethylaniline ( CF 3 C 6 H 4 NH 2 ) 2.75 5.62E-12
Basicity
Like ammonia , amines are bases . [ 8 ] Compared to alkali metal hydroxides , amines are weaker ( see table for examples of conjugate acid Ka values ) .
In organic chemistry, amines (/əˈmiːn, ˈæmiːn/, UK also /ˈeɪmiːn/) are compounds and functional groups that contain a basic nitrogen atom with a lone pair. Amines are formally derivatives of ammonia, wherein one or more hydrogen atoms have been replaced by a substituent such as an alkyl or aryl group (these may respectively be called alkylamines and arylamines; amines in which both types of substituent are attached to one nitrogen atom may be called alkylarylamines). Important amines include amino acids, biogenic amines, trimethylamine, and aniline; see Category:Amines for a list of amines. Inorganic derivatives of ammonia are also called amines, such as monochloramine (NClH2). The substituent -NH2 is called an amino group. Compounds with a nitrogen atom attached to a carbonyl group, thus having the structure R-CO-NR′R″, are called amides and have different chemical properties from amines.