Which one is stronger donor compounds ? N(CH3)2 , NHCH3 , NH2

2 Answers
anor277
May 21, 2018

You might want to revise this question.....

Explanation:

#"Ammonia"#, #NH_3#, #"methylamine"#, #(H_3C)NH_2#, #"dimethylamine"#, #(H_3C)_2NH#, #"trimethylamine"#, #(H_3C)_3N#... ARE ALL room temperature gases with considerable water-solubility. #"Trimethylamine"# MIGHT be the strongest base, but the issue is also influenced by steric considerations.

The text, James E. Huheey, Inorganic Chemistry: Principles of Structure and Reactivity, gives a good discussion of this issue (and the text will be available in your library or from your chemistry teacher.)

Ernest Z.
May 21, 2018

The strongest electron pair donor is #("CH"_3)_2"N:"^"-"#

Explanation:

The strength if an electron-pair donor (Lewis base) depends on the availability of its sharable electrons.

Methyl groups are electron-donating. They increase the electron density around the #"N"# atom.

Thus, Lewis base strength increases in the order

#"H"_2"N:"^"-" < "CH"_3"NH:"^"-" < ("CH"_3)_2"N:"^"-"#

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