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We present herein a thoroughly study concerning synthesis, structure and fluorescent properties of two classes of pyrrolodiazine derivatives: pyrrolopyridazine respectively pyrrolophthalazine cycloadducts. The synthesis is straight and efficient, consisting in a 3+2 dipolar cycloaddition reaction of diazinium ylides to dipolarophiles with triple bound. The structure of compounds was proven by elemental and spectral analysis. The fluorescence studies reveal that the pyrrolodiazine compounds are intense blue emitter...