title: Indenopyrans - synthesis and photoluminescence properties.
abstract: New indeno[1,2-c]pyran-3-ones bearing different substituents at the pyran moiety were synthesized and their photophysical properties were investigated. In solution all compounds were found to be blue emitters and the trans isomers exhibited significantly higher fluorescence quantum yields (relative to 9,10-diphenylanthracene) as compared to the corresponding cis isomers. The solid-state fluorescence spectra revealed an important red shift of λmax due to intermolecular interactions in the lattice, along with an emission-band broadening, as compared to the solution fluorescence spectra.
authors.affiliation: Babeş-Bolyai University, Center of Supramolecular Organic and Organometallic Chemistry (CSOOMC) Cluj-Napoca, 11 Arany Janos, 400028 Cluj-Napoca, Romania.
authors.forename: Andreea Petronela
authors.initials: AP
authors.lastname: Diac
authors.affiliation: Babeş-Bolyai University, Center of Supramolecular Organic and Organometallic Chemistry (CSOOMC) Cluj-Napoca, 11 Arany Janos, 400028 Cluj-Napoca, Romania.
authors.forename: Ana-Maria
authors.initials: AM
authors.lastname: Ţepeş
authors.affiliation: Babeş-Bolyai University, Center of Supramolecular Organic and Organometallic Chemistry (CSOOMC) Cluj-Napoca, 11 Arany Janos, 400028 Cluj-Napoca, Romania.
authors.forename: Albert
authors.initials: A
authors.lastname: Soran
authors.affiliation: Babeş-Bolyai University, Center of Supramolecular Organic and Organometallic Chemistry (CSOOMC) Cluj-Napoca, 11 Arany Janos, 400028 Cluj-Napoca, Romania.
authors.forename: Ion
authors.initials: I
authors.lastname: Grosu
authors.affiliation: Babeş-Bolyai University, Center of Supramolecular Organic and Organometallic Chemistry (CSOOMC) Cluj-Napoca, 11 Arany Janos, 400028 Cluj-Napoca, Romania.
authors.forename: Anamaria
authors.initials: A
authors.lastname: Terec
authors.affiliation: Group Linear Conjugated Systems, CNRS Moltech-Anjou, University of Angers, 2 Boulevard Lavoisier 49045 Angers, France.
authors.forename: Jean
authors.initials: J
authors.lastname: Roncali
authors.affiliation: Babeş-Bolyai University, Center of Supramolecular Organic and Organometallic Chemistry (CSOOMC) Cluj-Napoca, 11 Arany Janos, 400028 Cluj-Napoca, Romania.
authors.forename: Elena
authors.initials: E
authors.lastname: Bogdan
keywords: UV–vis spectra; indenopyran-3-ones; organic fluorophores; pyrones; solid-state emission spectra; solution emission spectra