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

A precursor, C21H29NO8 (A1) was prepared by reactions of 1,1-dimethoxy-N,N-dimethylmethanamine and 1,5-dioxaspiro[5.5]undecane-2,4-dione. The new N-containing heterocyclic compound, C19H19NO4 (B1) was obtained by adding A1 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 center dot center dot center dot O intra- and intermolecular interactions. The title compound (B1) formed a 3D-network structure by weak C-H center dot center dot center dot O intermolecular interactions and pi center dot center dot center dot pi stacking interactions. The fluorescent behaviors of A1 and B1 in ethanol solution were discussed. The result shows that they exhibit blue and purplish blue emission, respectively.