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In the title compound, C11H13N3O2, the 1,2,3-triazole ring and the phenol ring form a dihedral angle of 55.46 (5)°. In the crystal, inversion-related mol­ecules associate through pairs of hy­droxy–phenol O—H...O hydrogen bonds, giving centrosymmetric cyclic dimers [graph set R22(18)]. These dimers are linked into infinite chains along [001], giving an overall two-dimensional network structure parallel to the bc plane through hy­droxy O—H...N and triazole C—H...N hydrogen bonds.

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The title thia­calix[4]arene derivative, C36H34Br2O8S4, adopts an unusual pinched cone conformation with the prop­oxy-substituted benzene rings inclined inward [forming a dihedral angle of 33.4 (1)°] and with the brominated benzene rings bent outward, making a dihedral angle of 66.1 (1)°. In the crystal, the mol­ecules form chains along [001] via C—H...S hydrogen bonds and S...S contacts [S...S = 3.492 (3) Å]. The chains are associated into bilayers through C—H...O hydrogen bonds, generating an R22(10) motif.
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