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1.  5-Nitro-N 4,N 6-diphenyl­pyrimidine-4,6-diamine: polarized mol­ecules linked into π-stacked chains via three-centre C—H⋯(O)2 hydrogen bonds 
Mol­ecules of the title compound, C16H13N5O2, have no inter­nal symmetry despite the symmetric pattern of substitution in the pyrimidine ring. The intra­molecular distances indicate polarization of the electronic structure. There are two intra­molecular N—H⋯O hydrogen bonds and mol­ecules are linked into centrosymmetric dimers by pairs of three-centre C—H⋯(O)2 hydrogen bonds. These dimers are linked into chains by means of a π–π stacking inter­action.
PMCID: PMC2737422  PMID: 19726856
2.  2-Amino-3-methyl-6-[meth­yl­(phen­yl)­amino]-5-nitro­pyrimidin-4(3H)-one: polarized mol­ecules within hydrogen-bonded sheets 
The pyrimidinone ring in the title compound, C12H13N5O3, is effectively planar, despite the presence of five substituents. The bond distances provide evidence for significant polarization of the electronic structure, with charge separation, and the mol­ecules are linked into sheets by a combination of N—H⋯O and N—H⋯π(arene) hydrogen bonds. Comparisons are made with the mol­ecular and supra­molecular structures of the precursor compound 2-amino-6-[meth­yl(phen­yl)amino]-5-nitro­pyrimidin-4(3H)-one.
PMCID: PMC2737423  PMID: 19726857

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