N-bridgehead heterocyclic compounds with pyrrolo-diazinic moiety presents interesting optical properties, due to their containing of a π-excessive pyrrole and a π-deficient diazine ring [1-3], having fascinating practical applications such as electroluminescent materials, sensors, lasers, and other optoelectronic devices. In this respect, our research is focused on the synthesis of new pyrrolo-pyridazine and pyrrolo-phthalazine compounds with acetophenonic chain (I), and the study of their absorption properties in different solvents (UV-VIS spectra). To reach our goal we synthezise new isoindolo-1,2-diazine compounds with a aromatic chain, using a general and straightforward strategy (quaternization and cycloaddition reactions) under classical conditions and nonconventional methods [3-4].schemeScheme 1. The structures of new isoindolo1,2-diazine compounds with acetophenonic chain UV–VIS spectra were recorded with a Schimadzu UV-1800 spectrometer in two different solvents, one polar and another nonpolar, at room temperature. For all compounds the concentration used was 10-5M.