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In the title compound, C36H28O4, the 1-naphthoyl groups at the 1- and 8-positions of the central 2,7-dieth­oxy­naphthalene ring system are aligned almost anti­parallel and make a dihedral angle of 76.59 (4)°. The dihedral angles between the central 2,7-dieth­oxy­naphthalene ring system and the terminal naphthalene ring systems are 86.48 (4) and 83.97 (4)°. In the crystal, C—H...π inter­actions between the central naphthalene ring systems and the naphthoyl groups are observed along the a axis, with the mol­ecules forming a columnar structure. The columns are linked into chains parallel to the b axis by C—H...O inter­actions.

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The mol­ecule of the title compound, C26H18F2O8S2, lies across a crystallographic twofold rotation axis. The benzene rings of the 4-fluorobenzoyl groups make dihedral angles of 78.93 (12)° with the naphthalene ring system. An intra­molecular C—H...π inter­action occurs. In the crystal, a number of C—H...O inter­actions link the mol­ecules, forming a three-dimensional structure.

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The title molecule, C44H30O8, lies about a crystallographic inversion centre located at the centre of the central benzene ring. The benzene rings in the benzoyl and the terephthalate units make dihedral angles of 67.05 (7)° and 57.57 (7)°, respectively, with the naphthalene ring system. There is an intra­molecular C—H...O inter­action between the ketonic carbonyl O atom and an H atom on the naphthalene ring system. In the crystal, C—H...O inter­action of the benzene ring in the benzoyl group and weak C=O...π inter­action [O...centroid = 3.375 (2) Å] of the naphthalene ring with the O atom in the ketonic carbonyl group are observed. These inter­actions form layers parallel to the bc plane.
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