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In the title compound, C(10)H(11)N(5)O, the triazine ring forms a dihedral angle of 10.37 (4)° with the benzene ring. In the crystal, adjacent mol-ecules are linked by a pair of N-H⋯N hydrogen bonds, forming an inversion dimer with an R(2) (2)(8) ring motif. The dimers are further connected via N-H⋯O and N-H⋯N hydrogen bonds, resulting in a three-dimensional network.

The asymmetric unit of the title compound, 2C(10)H(11)N(5)O·C(6)H(10)O(4), consists of a 2,4-diamino-6-(4-meth-oxy-phen-yl)-1,3,5-triazine mol-ecule and one-half mol-ecule of adipic acid which lies about an inversion center. The triazine ring makes a dihedral angle of 12.89 (4)° with the adjacent benzene ring. In the crystal, the components are linked by N-H⋯O and O-H⋯N hydrogen bonds, thus generating a centrosymmetric 2 + 1 unit of triazine and adipic acid mol-ecules with R(2) (2)(8) motifs. The triazine mol-ecules are connected to each other by N-H⋯N hydrogen bonds, forming an R(2) (2)(8) motif and a supra-molecular ribbon along the c axis. The 2 + 1 units and the supra-molecular ribbons are further inter-linked by weak N-H⋯O, C-H⋯O and C-H⋯π inter-actions, resulting in a three-dimensional network.

In the title compound, C(14)H(13)NO(2)S, the thia-zolidine ring is approximately planar with a maximum deviation of 0.112 (1) Å. The furan ring is disordered over two orientations, with an occupancy ratio of 0.901 (5):0.099 (5). The central thia-zolidine ring makes dihedral angles of 85.43 (8), 87.50 (11) and 87.9 (9)° with the phenyl ring and the major and minor components of the disordered furan ring, respectively. In the crystal, mol-ecules are connected by weak inter-molecular C-H⋯O hydrogen bonds, forming supra-molecular chains parallel to the b axis.

In the title compound, C(16)H(15)NOS, the thia-zolidine ring, which is essentially planar [maximum deviation = 0.071 (2) Å], makes dihedral angles of 88.01 (8) and 87.21 (8)° with the terminal phenyl rings. The dihedral angle between the phenyl rings is 49.45 (5)°. In the crystal, mol-ecules are linked by a weak inter-molecular C-H⋯O hydrogen bond, forming a supra-molecular chain along the b axis. Furthermore, the crystal packing is stabilized by a weak C-H⋯π inter-action.

The asymmetric unit of the title compound, C(19)H(16)FN(3)O, contains two crystallographically independent mol-ecules. The triazole rings in both mol-ecules are essentially planar with maximum deviations of 0.002 (1) and 0.001 (1) Å. The dihedral angles between the benzene and fluorophenyl rings are 79.36 (9) and 89.40 (10)° in the two molecules. In the crystal, the two independent mol-ecules are linked by C-H⋯N hydrogen bonds, forming dimers. Furthermore, the crystal structure is stabilized by C-H⋯π inter-actions.

The asymmetric unit of the title compound, C(19)H(17)N(3)O, contains two independent mol-ecules. In one mol-ecule, the essentially planar triazole ring [maximum deviation = 0.003 (2) Å] forms dihedral angles of 5.57 (12) and 87.51 (12)° with the two phenyl rings, while in the other mol-ecule [maximum deviation in triazole ring = 0.001 (2) Å] these angles are 1.55 (10) and 82.73 (11)°. The dihedral angles between the two phenyl rings in the two mol-ecules are 87.77 (13) and 81.22 (11)°. In the crystal, the independent mol-ecules are connected via a weak C-H⋯N hydrogen bond, forming dimers. Further stabilization is provided by weak C-H⋯π inter-actions.