title: Regioselective synthesis of 1,2- vs 1,3-squaraines.
abstract: Squaraines have been known for many decades as very stable and versatile vis-NIR absorbing dyes. They have found applications for example as sensitizers in organic photovoltaics and photodetectors. The most common squaraine structure is the 1,3-regioisomer. Their 1,2-regioisomers are seldom mentioned and unanimously regarded as side products. A facile direct synthesis of 1,2-squaraines, highlighting the role played by reaction conditions and electronic factors, is described. The first electrochemical characterization of these dyes is also shown.
authors: Department of Materials Science and INSTM, University of Milano-Bicocca, Via Cozzi 53, I-20125, Milano, Italy.
authors: Elisabetta
authors: E
authors: Ronchi
authors: Riccardo
authors: R
authors: Ruffo
authors: Silvia
authors: S
authors: Rizzato
authors: Alberto
authors: A
authors: Albinati
authors: Luca
authors: L
authors: Beverina
authors: Giorgio A
authors: GA
authors: Pagani