Table 1. Inter­molecular distances (Å) in the unit cells of [ ^R NHC₂ R ₁][X]₂·nH₂O.

Standard deviations for distances including some H atoms are omitted where H atoms were positionally fixed.

Compound	Atoms	Distance
[ t BuNHC2Me][Br]2·H2O	Br1⋯H1D	2.575 (4)
[ t BuNHC2Et][Br]2·2H2O	Br1⋯H1A	2.398
	Br2⋯H1B	2.439
[MesNHC2Me][Br]2·2H2O	Br1⋯H2A	2.413
	Br2⋯H1A	2.463
	O1A⋯H2B	2.125
[MesNHC2Et][Br]2·4H2O	O1⋯H2B	1.994 (2)
	O2⋯H1E	2.001 (3)
	Br1⋯H1D	2.585 (2)