title: Dual-Emissive Difluoroboron Naphthyl-Phenyl β-Diketonate Polylactide Materials: Effects of Heavy Atom Placement and Polymer Molecular Weight.
abstract: Luminescent materials are important for imaging and sensing. Aromatic difluoroboron β-diketonate complexes (BF2bdks) are classic fluorescent molecules that have been explored as photochemical reagents, two-photon dyes, and oxygen sensors. A series of BF2bdks with naphthyl and phenyl groups was synthesized, and photophysical properties were investigated in both methylene chloride and poly(lactic acid) (PLA). Polymer molecular weight and dye attachment site along with bromide heavy atom placement were varied to tune optical properties of dye-PLA materials. Systems without heavy atoms have long phosphorescence lifetimes, which is useful for lifetime-based oxygen sensing. Bromine substitution on the naphthyl ring resulted in intense, clearly distinguishable fluorescence and phosphorescence peaks important for ratiometric oxygen sensing and imaging.
authors: Department of Chemistry, University of Virginia , McCormick Road, Charlottesville, Virginia 22904, United States.
authors: Jelena
authors: J
authors: Samonina-Kosicka
authors: Department of Chemistry, University of Virginia , McCormick Road, Charlottesville, Virginia 22904, United States.
authors: Christopher A
authors: CA
authors: DeRosa
authors: Department of Chemistry, University of Virginia , McCormick Road, Charlottesville, Virginia 22904, United States.
authors: William A
authors: WA
authors: Morris
authors: Department of Chemistry, University of Virginia , McCormick Road, Charlottesville, Virginia 22904, United States.
authors: Ziyi
authors: Z
authors: Fan
authors: Department of Chemistry, University of Virginia , McCormick Road, Charlottesville, Virginia 22904, United States.
authors: Cassandra L
authors: CL
authors: Fraser