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The mol­ecular conformation of title compound, C12H11N3S, is almost planar [maximum deviation = 0.063 (2) Å]; an intra­molecular C—H...N hydrogen bond is noted. In the crystal, mol­ecules inter­act with each other via π–π stacking inter­actions between thia­zole rings [centroid–centroid distance = 3.7475 (9) Å] and methyl-H...π(C6) inter­actions, forming columns along the a axis.

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In the title compound, C13H13NO3S, the dihedral angle between the benzene rings is 64.15 (7)° and the C—S—N—C torsion angle is −57.18 (12)°. An intra­molecular N—H...O hydrogen bond closes an S(5) ring. In the crystal, O—H...O hydrogen bonds link the mol­ecules into C(8) chains propagating in [100]. Weak C—H...π inter­actions are also observed.

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In the title compound, C11H16N2O, the dihedral angle between the mean plane of the 4-methypyridine group and the plane of the amide link is 16.7 (1)°, and there is a short intra­molecular C—H...O contact. Hydrogen bonding (N—H...O) between amide groups forms chains parallel to the b axis. Pairs of methyl­pyridine groups from mol­ecules in adjacent chains are parallel but there is minimal π–π inter­action.

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In the title compound, C20H21N3O2·H2O (EQR·H2O), the quinazoline ring system forms dihedral angles of 53.1 (1) and 85.6 (1)° with the phenyl ring and the amide link, respectively. In the crystal, O—H...O hydrogen bonds link two EQR and two water mol­ecules into a centrosymmetric R44(18) ring motif. N—H...O hydrogen bonds further link these hydrogen-bonded fragments into columns extending in [010].

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In the title compound, C9H10BrClN2S, the di­methyl­thio­urea group is twisted from the benzene ring plane by 54.38 (6)°. In the crystal, the amino groups are involved in the formation of N—H...S hydrogen bonds, which link the mol­ecules into chains along [010]. Weak C—H...Cl inter­actions further link these chains into layers parallel to the ab plane.

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In the title compound, C15H12N2S, the methylthioquinazoline group is planar with the methyl C displaced by only 0.116 (3) Å from the plane of the quinazoline moiety. The dihedral angle between the phenyl ring and the quinazoline ring system is 13.95 (5)°. In the crystal, each molecule is linked by π–π stacking between to two adjacent inversion-related molecules. On one side, the inverted quinazoline groups interact with a centroid–centroid distance of 3.7105 (9) Å. On the other side, the quinazoline group interacts with the pyrimidine and phenyl rings of the second neighbour with centroid–centroid distances of 3.5287 (8) and 3.8601 (9) Å, respectively.
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