Experimental Crystal data

R factor = 0.042; wR factor = 0.088; data-to-parameter ratio = 14.4. In the title compound, C26H24Br2N2O2, the central naphtha-lene system carries two Br atoms and two –CH2CH2NHC6H5 substituents. The phenyl rings of the latter residues are inclined at 74.17 (17) and 51.4 (2) with respect to the naphthalene ring system. Each alkyl chain adopts a fully extended all-cis conformation with respect to the naphthalene and phenyl rings [N—C—C—O torsion angles = 68.6 (4) and 60.5 (4)]. In the crystal, one of the N—H groups forms bifurcated N—H (Br,O) hydrogen bonds, which link the molecules into inversion-related dimers. The centrosymmetric dimers are aggregated via pairs of C—H interactions into sheets parallel to (110). Related literature For background information on applications of open-chain crown ethers in extraction and analysis, see: Zhang et al