title: Matrix screening of substituted N-aryl-1,8-naphthalimides reveals new dual fluorescent dyes and unusually bright pyridine derivatives.
abstract: A 3 x 14 matrix of substituted N-aryl-1,8-naphthalimides was synthesized for the evaluation and discovery of dual fluorescence. Because of their unique photophysical properties, these dual fluorescent systems represent an exception to the widely studied TICT (Twisted Internal Charge Transfer) fluorescent dyes or tautomeric benzofluorescein class of two-color dyes. The matrix library was designed to investigate the effects of heterocycles, particularly pi-excessive and pi-deficient systems. Of the 42 compounds surveyed, five displayed well-resolved two-color emission in solvents as nonpolar as hexane. Based on the observed trends in fluorescence lambda(max) and quantum yield, a new model is proposed that predicts LW and SW emission for these systems. In addition, this model provides potential design features for the synthesis of new dual fluorescent species.
authors.affiliation: Department of Chemistry, New Mexico Institute of Mining & Technology, Socorro, NM 87801, USA.
authors.forename: Haishi
authors.initials: H
authors.lastname: Cao
authors.forename: Virginia
authors.initials: V
authors.lastname: Chang
authors.forename: Randy
authors.initials: R
authors.lastname: Hernandez
authors.forename: Michael D
authors.initials: MD
authors.lastname: Heagy
mesh_terms: D000577:Amides / Q000138:chemical synthesis / Q000737:chemistry; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000138:chemical synthesis* / Q000737:chemistry; D008958:Models, Molecular; D015394:Molecular Structure; D009281:Naphthalenes / Q000138:chemical synthesis* / Q000737:chemistry; D010777:Photochemistry; D011725:Pyridines / Q000138:chemical synthesis* / Q000737:chemistry; D013816:Thermodynamics
chemical_list: D000577:Amides; D005456:Fluorescent Dyes; D009281:Naphthalenes; D011725:Pyridines