title: Dye Encapsulation in Polynorbornene Micelles.
abstract: The encapsulation efficiency of high-Tg polynorbornene micelles was probed with a hydrophobic dye 2,6-diiodoboron-dipyrromethene (BODIPY). Changes in the visible absorption spectra of aggregated versus monomeric dye molecules provided a probe for assessing encapsulation. Polynorbornene micelles are found to be capable of loading up to one BODIPY dye per ten polymers. As the hydrophilic block size increased in the polymeric amphiphiles, more of the dye was incorporated within the micelles. This result is consistent with the dye associating with the polymer backbone in the shell of the micelles. The encapsulation rate varied significantly with temperature, and a slight dependence on micellar morphology was also noted. Additionally, we report a 740 μs triplet lifetime for the encapsulated BODIPY dye. The lifetime is the longest ever recorded for a BODIPY triplet excited state at room temperature and is attributed to hindered triplet-triplet annihilation in the high-viscosity micellar shell.
authors: Department of Chemistry & Biochemistry, University of California, San Diego , 9500 Gilman Drive, MC 0343, La Jolla, California 92093, United States.
authors: Nia C
authors: NC
authors: Bell
authors: Department of Chemistry & Biochemistry, University of California, San Diego , 9500 Gilman Drive, MC 0343, La Jolla, California 92093, United States.
authors: Samantha J
authors: SJ
authors: Doyle
authors: Department of Chemistry "G. Ciamician", University of Bologna , Via Selmi 2, Bologna, Italy.
authors: Giulia
authors: G
authors: Battistelli
authors: Department of Chemistry & Biochemistry, University of California, San Diego , 9500 Gilman Drive, MC 0343, La Jolla, California 92093, United States.
authors: Clare L M
authors: CL
authors: LeGuyader
authors: Department of Chemistry & Biochemistry, University of California, San Diego , 9500 Gilman Drive, MC 0343, La Jolla, California 92093, United States.
authors: Matthew P
authors: MP
authors: Thompson
authors: Department of Chemistry, University of Massachusetts Amherst , 710 North Pleasant Street, Amherst, Massachusetts 01003-9336, United States.
authors: Ambata M
authors: AM
authors: Poe
authors: Department of Chemistry & Biochemistry, University of California, San Diego , 9500 Gilman Drive, MC 0343, La Jolla, California 92093, United States.
authors: Arnold
authors: A
authors: Rheingold
authors: Department of Chemistry & Biochemistry, University of California, San Diego , 9500 Gilman Drive, MC 0343, La Jolla, California 92093, United States.
authors: Curtis
authors: C
authors: Moore
authors: Department of Chemistry "G. Ciamician", University of Bologna , Via Selmi 2, Bologna, Italy.
authors: Marco
authors: M
authors: Montalti
authors: Department of Chemistry, University of Massachusetts Amherst , 710 North Pleasant Street, Amherst, Massachusetts 01003-9336, United States.
authors: S
authors: S
authors: Thayumanavan
authors: Department of Chemistry & Biochemistry, University of California, San Diego , 9500 Gilman Drive, MC 0343, La Jolla, California 92093, United States.
authors: Michael J
authors: MJ
authors: Tauber
authors: Department of Chemistry & Biochemistry, University of California, San Diego , 9500 Gilman Drive, MC 0343, La Jolla, California 92093, United States.
authors: Nathan C
authors: NC
authors: Gianneschi