FROM PARA-DIMETHOXYBENZENE TOWARD CROWNBENZENOPHANES .2. SYNTHESIS, X-RAY STRUCTURE AND FLUORESCENCE EMISSION PROPERTIES OF 1,3,10,13,16,19,22-HEPTAOXA(3,13)[28]PARACYCLOPHANE AND ITS COMPLEX WITH SODIUM-CATION

The synthesis and X-ray molecular structure of the title compound, an heptaoxa[3,13]paracyclophane, as well as that of its 1:1 sodium complex are described; a study of the absorption and fluorescence spectra indicates that this crown-cyclophane behaves as a hybrid between strained classical cyclophanes and large macrocycles.