Synthesis, Characterization, and Fluorescence Properties of Two New Heterocyclic Compounds Containing 1,5-Dioxaspiro Group.

A precursor, C₂₁H₂₉NO₈ (<bold>A1</bold>) was prepared by reactions of 1,1-dimethoxy-<italic>N</italic>,<italic>N</italic>-dimethylmethanamine and 1,5-dioxaspiro[5.5]undecane-2,4-dione. The new <italic>N</italic>-containing heterocyclic compound, C₁₉H₁₉NO₄ (<bold>B1</bold>) was obtained by adding <bold>A1</bold> into ethanol solution of o-toluidine. The crystal structure determination of two compounds were both found to belong to the triclinic P-1 space group. The precursor includes one (C₂H₈N)⁺ cation and one (C₁₉H₂₁O₈)⁻ anion, which constituted a chained structure by N–H···O intra- and intermolecular interactions. The title compound (<bold>B1</bold>) formed a 3D-network structure by weak C–H···O intermolecular interactions and <italic>π</italic>···<italic>π</italic> stacking interactions. The fluorescent behaviors of <bold>A1</bold> and <bold>B1</bold> in ethanol solution were discussed. The result shows that they exhibit blue and purplish blue emission, respectively. [ABSTRACT FROM AUTHOR]