Oct 4, 2024 - 1:10 PM
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Location
1352 Gilman Hall
Hosted by: Art Winter
Title: "1,4-Dihydro[1,2,4]triazin-4-yl: A stable paramagnetic building block for functional magnetic materials"
Abstract
1,4-Dihydro[1,2,4]triazin-4-yl is the fundamental paramagnetic structural element of stable radicals formally derived from the prototypical Blatter radical discovered over half a century ago. High chemical stability and favorable electrochemical, spectroscopic and magnetic properties of benzo[e][1,2,4]triazinyls (Blatter-type radicals) resulted in a rapidly growing interest in applications of such open-shell systems in emerging technologies. The increasing demand for stable radicals with tailored properties drives development of synthetic methods. In this context we have demonstrated several synthetic strategies, such as anionic, radical, aza-Pschorr, and Mallory-type photocyclization, which allow for a formal “docking” of the 1,4-dihydro[1,2,4]triazin-4-yl fragment with its e and f edges to larger polycyclic aromatics leading to p-delocalized paramagnetic sub-nanographenes. The new synthetic methods were used to access unprecedented classes of paramagnetic liquid crystals, axially chiral radicals, and diradicals.
Bio
Piotr Kaszynski is a Professor of Chemistry at the Centre of Molecular and Macromolecular Studies of Polish Academy of Sciences and University of Łódź in Poland. He received his M.Sc. degree from Warsaw Polytechnic in Poland at 1985, Ph.D. degree in Organic Chemistry in 1991 (University of Texas at Austin), and habilitation in 2007 (University of Łódź). He spent two years at Caltech as a postdoctoral fellow working in the area of organic magnetic materials, before joining Vanderbilt University in Nashville, TN, USA in 1993. In 2015 he moved the bulk of his research program to Polish Academy of Sciences, while maintaining ties with Middle Tennessee State University in USA. His research involves boron clusters and stable radicals and is focused on the design, synthesis and characterization of organic materials for electrooptical, molecular electronics, photovoltaic and spintronic applications and for studying of molecular magnetism in solid-state and liquid crystalline media. He has published over 200 original papers, and several book chapters and reviews.