Title | Masked Michael Acceptors in Poly(phenyleneethynylene)s for Facile Conjugation |
Publication Type | Journal Article |
Year of Publication | 2006 |
Authors | Bailey, GC, Swager, TM |
Journal | Macromolecules |
Volume | 39 |
Pagination | 2815–2818 |
Date Published | apr |
ISSN | 0024-9297 |
Keywords | masked maleimide pendant group polyphenyleneethynylene conjugation enhanced, Michael acceptor side chain polyphenyleneethynylene conjugation enhanced, tetrahydroepoxyisoindoledione side chain polyphenyleneethynylene conjugation enhanced |
Abstract | Poly(phenyleneethynylene)s (PPEs) capable of reacting with thiol-contg. mols. have been designed and synthesized with no.-av. mol. wts. ranging from 8000 to 11,000. The PPEs contain pendent 3a,4,7,7a-tetrahydro-4,7-epoxy-1H-isoindole-1,3(2H)-dione groups available to participate in conjugate addn. and Diels-Alder chem. after being thermally activated. If the maleimide group is left unmasked during palladium-catalyzed cross-coupling polymn., it leads to side reactions and the prodn. only of short chain oligomers (Mn < 3000, DP ∼ 4). Reversible Diels-Alder reactions between the maleimides and furan were detd. to be a very effective method to produce a masked Michael acceptor that can be unveiled after polymn. under relatively mild thermal conditions. Cycloreversion to the maleimide has been monitored by thermogravimetric anal. (TGA), TGA-MS, IR, and NMR. A PPE contg. the masked maleimide unit has been modified with a thiolated carboxy-X-rhodamine (ROX) dye, and the resulting absorbance and fluorescence spectra as well as gel permeation chromatograms (GPC) are presented. [on SciFinder(R)] |
URL | http://pubs.acs.org/doi/abs/10.1021/ma052111u |
DOI | 10.1021/ma052111u |