title: Preparation of cadmium selenide-polyolefin composites from functional phosphine oxides and ruthenium-based metathesis.
abstract: Cadmium selenide nanoparticles, prepared by known methods, were stabilized with functional phosphine oxide 1, then used to support the polymerization of cyclic olefins radially outward from the surface by ruthenium-catalyzed ring-opening metathesis polymerization (ROMP). The conversion of compound 1 into the new metathesis catalyst 3 by carbene exchange and the subsequent polymerization of cyclic olefins were observed spectroscopically by (1)H NMR to afford for example CdSe-polycyclooctene composite 6. Transmission electron micrographs on thin films of these composites showed good nanoparticle dispersion. This is in stark contrast to the substantial nanoparticle aggregation observed when similar polymerizations were performed in the presence of conventional TOPO-covered nanoparticles. The methods reported here to prepare composite product 6 are applicable to other cyclic olefins, and suggest that this chemistry will be useful for incorporating CdSe nanoparticles into a wide variety of polymer matrices.
authors: Department of Polymer Science and Engineering, 120 Governors Drive, University of Massachusetts, Amherst, Massachusetts 01003, USA.
authors: Habib
authors: H
authors: Skaff
authors: M Firat
authors: MF
authors: Ilker
authors: E Bryan
authors: EB
authors: Coughlin
authors: Todd
authors: T
authors: Emrick
mesh_terms: D000475:Alkenes / Q000737:chemistry*; D019187:Cadmium Compounds / Q000737:chemistry*; D006844:Hydrocarbons, Cyclic / Q000737:chemistry*; D036103:Nanotechnology; D009795:Octanes / Q000737:chemistry; D009943:Organophosphorus Compounds / Q000737:chemistry*; D018036:Selenium Compounds / Q000737:chemistry*
chemical_list: D000475:Alkenes; D019187:Cadmium Compounds; D006844:Hydrocarbons, Cyclic; D009795:Octanes; D009943:Organophosphorus Compounds; D018036:Selenium Compounds; C044965:trioctyl phosphine oxide; C058667:cadmium selenide