Abstract

A search of the literature data reveals that there is a big request from the optoelectronic industry to obtain new high-performance, innovative, and convenient fluorescent organic small molecules, especially with extended conjugation. 1,2-Diazine (namely, pyridazine and phthalazine) and its fused derivatives are organic small molecules of invaluable importance in optoelectronics (as semiconductor devices, OLED devices, sensors), in medicine and pharmacy (as drugs, biosensors), in agriculture (as growth factors, insecticides, pesticides), etc.
The emphasis of this work was to obtain highly blue fluorescent small organic molecules with a pyridazine and phthalazine skeleton. In this respect, we synthesize two classes of cycloadducts with pyrrolodiazine skeleton: pyrrolopyridazine respectively pyrrolophthalazine. The structure of compounds was proven by elemental and spectral analysis. The fluorescence studies reveal that some particularly pyrrolopyridazine cycloadducts are intense blue emitters (in the region of 400 nm), having a high quantum yield. The pyrrolopyridazine derivatives anchored with an ester or methyl group in the 7-th position have the best fluorescent properties, being very intense blue emitters and having a high quantum yield, up to 90%.

Acknowledgments: The authors are thankful for financial support to INTEGRATED INTERDISCIPLINARY SYSTEM FOR THE IMPLEMENTATION OF SUSTAINABLE DEVELOPMENT ACTIVITIES IN THE NORTH-EASTERN REGION OF ROMANIA (SIDNER), code SMIS 337821, contract no. 716/04.06.2025.

Biography

Dr.Mangalagiu has completed her PhD at the University of Suceava (Romania), and postdoctoral studies to the same university. Presently, she is a senior researcher to Alexandru Ioan Cuza University of Iasi and lecturer to University of Suceava. The research is focused on the area of Heterocycles Compounds. She has published more than 75 papers in reputable journals, holds approximately 15 patents, 6 international chapter books, a Hirsh index of 13 (WOS), 18 (Google), and serves as an editorial board member of several journals. She was awarded with numerous national and international prizes and honors.