Synthesis, characterization, and crystal structures of N,N′-bis­(2-di­alkyl­amino­phen­yl)thio­ureas

N,N′-Bis[2-(di­methyl­amino)­phen­yl]thio­urea, C(17)H(22)N(4)S (1), and N,N′-bis­[2-(di­ethyl­amino)­phen­yl]thio­urea, C(21)H(30)N(4)S (2), were prepared by the treatment of 1,1′-thio­carbonyl­diimidazole and 2 equivalents of 2-amino-N,N′-di­alkyl­aniline. Both compounds exhibit intra­molecular hydrogen bonds between the N—H(thio­urea) and NR (2) (R = Me, Et) groups. The other N—H bonds face the sulfur atoms of S=C bonds in an adjacent mol­ecule, which forms an inter­molecular inter­action in the packed structure. The structural details match the spectroscopic data acquired from NMR and IR spectroscopy.