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In the title compound, C13H10BrN3O3, the pyrimidine and benzene rings are twisted with an inter­planar angle of 58.4 (1)°. The secondary amide group adopts a cis conformation with an H—N—C—O torsion angle of 14.8 (1)°. In the crystal, mol­ecules are connected into inversion dimers via pairs of N—H...N hydrogen bonds, generating an R22(8) motif. The dimers are further connected through a C—Br...O inter­action [3.136 (1) Å and 169.31 (1)°] into a chain along [110]. Weak C—H...N hydrogen bonds between the methyl benzoate groups and pyrimidine rings are also observed in the crystal structure.

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In the title compound, 2C4H6N3+·SO42−, the cations are each essentially planar with r.m.s. deviations of the fitted atoms of 0.008 and 0.002 Å. In the crystal, adjacent ions are linked by N—H...O, C—H...O and C—H...N hydrogen bonds, forming a three-dimensional network.

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In the title compound, C6H10N3+·Cl, the cation is essentially planar with an r.m.s. deviations of the fitted atoms of 0.008 Å. In the crystal, adjacent ions are linked by weak N—H...Cl hydrogen bonds involving the pyrimidine and amine N atoms, forming a three-dimensional network. C—H...π inter­actions between the methyl and pyrimidine groups and π–π stacking [centroid–centroid distance = 3.474 (1) Å] between parallel pyrimidine ring systems are also observed.
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