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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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In the mol­ecule of the title compound, C28H22F2O4, the benzoyl groups are aligned almost anti­parallel and the fluorobenzene rings form a dihedral angle of 14.12 (7)°. The dihedral angles between the 2,7-dieth­oxy­naphthalene ring system and the benzene rings are 70.00 (4) and 67.28 (4)°. In the crystal, mol­ecules are linked by C—H...O and C—H...F hydrogen bonds, forming layers parallel to the ab plane. The layers are further connected by π–π inter­actions [centroid–centroid distances of 3.6115 (10) Å] into a three-dimensional structure.
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