Physical data for organic nitrogen compounds

Boiling and melting points of amines, diamines, pyrroles, pyridines, piperidines and quinolines shown together with their molecular structures, as well as molweights and density.

The figures below show the boiling and melting point for organic nitrogen compounds as amines, diamines, pyrroles, pyridines, piperidines and quinolines, together with the molecular structures of the different compounds. The table shows the same numbers together with the molecular weight and density, as well as the numbers of carbon, hydrogen and nitrogen atoms in the molecules. All numbers are given for boiling and melting at 1 atm (760 mm Hg). For some compounds the boiling point at 1 atm is not available. For these, the 1 atm boiling point is estimated from low pressure measurements, using a vaporization heat of 54- 70 kJ/mol (increasing with increasing BP).  It is not known whether these compounds are stable at the 1 atm boiling temperature or not. Definitions of the different organic classes are given below the figures.

  • Boiling point - the temperature at which a liquid turns into a gas
  • Melting point - the temperature at which a solid turns into a liquid

See also similar figures and tables for organic sulfur compounds  and boiling and melting point of hydrocarbons, alcohols and acids, as well as densities of organic sulfur compounds and  pKa of amines, diamines and cyclic organic nitrogen compounds

Boiling and melting point of amines

Boiling and melting point of pyrroles





Boiling and melting point of piperidines





Boiling and melting point of pyridines





Boiling and melting point of diamines




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GroupCompound nameCommon name #C #H #N Molweight
[g/mol]
Melting point
[°C]
Boiling point
[°C]
Density@20°C
[g/cm3]
1-Amine Methylamine Methanamine 1 5 1 31.06 -93 -6 0.660
1-Amine Ethylamine Ethanamine 2 7 1 45.08 -81 17 0.685
1-Amine Propylamine 1-Propanamine 3 9 1 59.11 -85 47 0.717
1-Amine Butylamine 1-Butanamine 4 11 1 73.14 -49 77 0.741
1-Amine Pentylamine Amylamine 5 13 1 87.16 -51 105 0.754
1-Amine Hexylamine 1-Hexanamine 6 15 1 101.19 -21 132 0.766
1-Amine Heptylamine 1-Heptanamine 7 17 1 115.22 -23 153 0.775
1-Amine Octylamine 1-Octanamine 8 19 1 129.24 0 179 0.783
1-Amine Nonylamine 1-Nonanamine 9 21 1 143.27 -1 198 0.791
1-Amine Decylamine 1-Decanamine 10 23 1 157.30 15 217 0.794
1-Amine Undecylamine 1-Undecanamine 11 25 1 171.32 15 229 0.798
1-Amine Dodecylamine 1-Dodecanamine 12 27 1 185.35 28 255 0.802
1-Amine (Tridecyl)amine 1-Tridecanamine 13 29 1 199.38 27 273 0.806
1-Amine Tetradecylamine 1-Tetradecanamine 14 31 1 213.40 39 289 0.808
1-Amine Pentadecylamine Pentadecanamine 15 33 1 227.43 37 312 0.810
1-Amine Hexadecylamine 1-Hexadecanamine 16 35 1 241.46 46 321 0.813
1-Amine Octadecylamine 1-Octadecanamine 18 39 1 269.51 53 350 0.862
1-Amine Icosylamine 1-Eicosanamine 20 43 1 297.56 389
Amine Dimethylamine Methyl methylamine 2 7 1 45.08 -92 7 0.654
Amine Allylamine 2-propen-1-amine 3 7 1 57.09 -88 54 0.758
Amine Trimethylamine Dimethyl methylamine 3 9 1 59.11 -117 3 0.631
Amine 2-Propanamine 3 9 1 59.11 -95 32 0.682
Amine tert-Butylamine 2-Methyl-2-propanamine 4 11 1 73.14 -67 46 0.696
Amine Diethylamine Ethyl ethylamine 4 11 1 73.14 -50 56 0.706
Amine sec-Butylamine 2-Butanamine 4 11 1 73.14 -105 63 0.725
Amine Butylamine 1-Butanamine 4 11 1 73.14 -49 77 0.741
Amine iso-Butylamine 2-Methyl-1-propanamine 5 12 1 86.16 -85 68 0.730
Amine Aniline 6 7 1 93.13 -6 184 1.025
Amine N-allyl-2-propen-1-amine Diallylamine 6 11 1 97.16 112
Amine Cyclohexylamine 6 13 1 99.17 -18 134 0.819
Amine Triethylamine Diethyl ethylamine 6 15 1 101.19 -115 90 0.727
Amine o-Toluidine 2-Aminotoluene, 2-Methylaniline 7 9 1 107.15 -28 199 1.010
Amine p-Toluidine 4-Aminotoluene, 4-Methylaniline 7 9 1 107.15 44 201 0.975
Amine m-Toluidine 3-Aminotoluene, 3-Methylaniline 7 9 1 107.15 -30 203 1.001
Amine Allyldimethylamine N,N-dimethyl-2-propen-1-amine 7 15 1 113.20 62 0.713
Amine Allyldiethylamine N,N-diethyl-2-propen-1-amine 7 15 1 113.20 110 0.752
Amine n-Allylaniline Allylphenylamine 9 11 1 133.19 219 0.977
Amine 2-Naphthylamine 2-Aminonaphthalene 10 9 1 143.19 112 306 1.063
Amine 4-tert-Pentylaniline 11 17 1 163.26 261
Amine 2-Aminobiphenyl 2-Biphenylylamine, 2-Phenylaniline 12 11 1 169.22 48 299
Amine Diphenylamine N-phenyl-aminobenzene 12 11 1 169.22 51 302 1.160
Amine 4-Aminobiphenyl 4-Phenylaniline, Xenylamine 12 11 1 169.22 53 348*
Amine Alverine N-ethyl-bis(3-phenylpropyl)-amine 20 27 1 281.44 470*
Pyrrole Pyrrole Imidole 4 5 1 67.09 -23 130 0.970
Pyrrole 2,5-Dihydro-1H-pyrrole Pyrrolines 4 7 1 69.11 90 0.910
Pyrrole Pyrrolidine Azacyclopentane, Tetrahydropyrrole 4 9 1 71.12 -58 87 0.859
Pyrrole 1-Ethyl-1H-pyrrole 6 9 1 95.14 130 0.901
Pyrrole 1,2,5-Trimethylpyrrole 7 11 1 109.17 168 0.810
Pyrrole 2,3-Benzopyrrole 1H-Indole 8 7 1 117.15 52 254 1.222
Pyrrole Indoline 2,3-Dihydroindole, 1-Azaindan 8 9 1 119.16 220 1.065
Pyrrole Isoindoline 8 9 1 119.16 17 221 1.052
Pyrrole 3-Ethyl-2,4-dimethyl-1H-pyrrole 8 13 1 123.20 0 197 0.913
Pyrrole 1-Phenyl-1H-pyrrole 10 9 1 143.19 61 234
Pyrrole 2-Phenyl-1H-pyrrole 10 9 1 143.19 130 270
Pyrrole 1-phenylpyrrolidine 10 13 1 147.22 11 250* 1.018
Pyridine Pyridine 5 5 1 79.10 -42 115 0.982
Pyridine 2-Ethylpyridine 7 9 1 107.15 -63 149 0.952
Pyridine 3-Ethylpyridine 7 9 1 107.15 -77 166 0.956
Pyridine 4-Ethylpyridine 7 9 1 107.15 -91 168 0.942
Pyridine 2,3,6-trimethylpyridine 2,3,6-Collidine 8 11 1 121.18 170 0.924
Pyridine 2,4,6-trimethylpyridine 2,4,6-Collidine 8 11 1 121.18 -44 170 0.917
Pyridine 2-(3-pentenyl)pyridine 10 13 1 147.22 216 0.925
Pyridine 2-phenylpyridine 11 9 1 155.20 271 1.085
Pyridine 3-phenylpyridine 11 9 1 155.20 274 1.084
Pyridine 4-phenylpyridine 11 9 1 155.20 70 275
Pyridine 4-(3-cyclohexen-1-y)pyridine 11 13 1 159.23 22 226 1.024
Pyridine 4-Benzylpyridine 12 11 1 169.22 287 1.063
Pyridine 2-(2-Phenylethyl)pyridine 13 13 1 183.25 -2 289 1.039
Pyridine 4-(1-butylpentyl)pyridine 14 23 1 205.34 265 0.890
Piperidine Piperidine 5 11 1 85.15 -13 106 0.862
Piperidine 4-Phenylpiperidine 11 15 1 161.24 61 257 0.998
Piperidine 1-Phenylpiperidine 11 15 1 161.24 5 260 0.996
Quinoline Quinoline 1-Azanapthalene 9 7 1 129.16 -15 237 1.096
Quinoline Isoquinoline 9 7 1 129.16 27 242 1.101
Quinoline 5,6,7,8-tetrahydroisoquinoline 9 11 1 133.19 225* 1.032
Quinoline 1,2,3,4-tetrahydroisoquinoline 9 11 1 133.19 -30 233 1.066
Quinoline 1,2,3,4-tetrahydroquinoline 9 11 1 133.19 10 249 1.063
Quinoline Perhydroisoquinoline Decahydroisoquinoline 9 17 1 139.24 212 0.938
Quinoline Benzo(h)quinoline 13 9 1 179.22 51 341 1.234
Quinoline Acridine Dibenzo[b,e]pyridine 13 9 1 179.22 111 347 1.005
Quinoline Benzo[c]quinoline Phenanthridine 13 9 1 179.22 107 350
Quinoline Benzo(f)quinoline 13 9 1 179.22 92 352
Diamine N-Methylethylenediamine 2-(Methylamino)ethylamine 3 10 2 74.12 115 0.850
Diamine Ethylenediamine 1,2-Diaminoethane 2 4 2 56.07 9 118 0.902
Diamine N-Isopropylethylenediamine 2-(Isopropylamino)ethylamine 5 14 2 102.18 136 0.822
Diamine N,N-Diethylethylenediamine 2-Diethylaminoethylamine 6 16 2 116.20 146 0.830
Diamine 1,5-Diamino-2-methylpentane 2-Methyl-1,5-pentanediamine 6 16 2 116.20 193 0.863
Diamine 1,2-diaminobenzene o-phenylenediamine 6 8 2 108.14 102 256
Diamine N-Phenylethylenediamine 8 12 2 136.19 263 1.043
Diamine 1,4-diaminobenzene p-Phenylenediamine 6 8 2 108.14 140 267
Diamine N-(Phenylmethyl)-1,2-ethane-diamine 9 14 2 150.22 270*
Diamine 1,3-diaminobenzene m-phenylenediamine 6 8 2 108.14 65 282
Diamine 1,2-Diphenylhydrazine Hydrazobenzene 12 12 2 184.24 129 1.156
Diamine 1,1-Diphenylhydrazine 12 12 2 184.24 51 344* 1.188
Diamine 1,1-biphenyl-2,2-diamine 12 12 2 184.24 81 363* 1.309
Diamine p-Benzidine 1,1-biphenyl-4,4-diamine 12 12 2 184.24 127 401
Diamine N,N′-Diphenylethylenediamine 1,2-Dianilinoethane, 14 16 2 212.29 74 404*
* Values estimated for 1 atm from low pressure measurements

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Definition of organic compounds

Hydrocarbon: An organic compound consisting entirely of hydrogen and carbon.

Alkane: An acyclic saturated hydrocarbon, with the general formula CnH2n+2. Also called paraffin.

Aromatic hydrocarbon: A cyclic (ring-shaped), planar (flat) molecule with a ring of resonance bonds that exhibits more stability than other geometric or connective arrangements with the same set of atoms. The simplest of the aromatics have 6 carbon atoms and contains 3 double bounds.  A one ring aromatic without any substituents is called benzene, with the formula C6H6.

Alkyl: An alkyl group is an alkane substituent missing one hydrogen, with general formula CnH2n+1

Phenyl: An phenyl group is a benzene substituent missing one hydrogen, with general formula C6H5.

Organic nitrogen compounds:

Amine: A compound or functional group that contain a basic nitrogen atom with a lone pair. It can be a primary (R-NH2), a secondary (R',R''-NH) or a tertiary amine (R',R'',R'''-N), where R represent an alkyl or other organic substituent. For 1-amines in this document the R represents an alkyl group, in which the NH2-group is placed at the end of the the alkane chain.

Diamine: An amine with two amino groups.

Pyrrole: A heterocyclic aromatic organic compound, a five-membered ring with two double bounds, with the formula C4H4NH. Substituted derivatives are called pyrroles.

Dihydropyrrole: A compound formally derived from the aromate pyrrole by partial hydrogenation, containing one double bound. Also called pyrroline.

Pyridine: A heterocyclic six-membered ring compound with the chemical formula C5H5N. It is structurally similar to benzene, with one methine group (=CH−) replaced by a nitrogen atom.

Piperidine: A heterocyclic amine consisting of a six-membered ring containing five methylene bridges (–CH2–) and one amine bridge (–NH–). The molecular formula is (CH2)5NH.

Quinoline: A heterocyclic aromatic organic compound, consisting of a benzene ring fused to a pyridine ring, with the molecular formula C9H7N and the nitrogen atom in position 1.

Isoquinoline: An analog to quinoline with the nitrogen atom in position 2.

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Related Topics

  • Boiling point - Documents giving boiling point of elements and different kind of chemical species at varying conditions
  • Material Properties - Material properties for gases, fluids and solids - densities, specific heats, viscosities and more
  • Melting point - freezing point - Documents giving melting or freezing point of elements and different kind of chemical species at varying conditions
  • Density - Density of different solid materials, liquids and gases. Definitions and convertion calculators.

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