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Excellent Control of Perylene Diimide End Group in Polyfluorene via Suzuki Catalyst Transfer Polymerization.
- Source :
-
Macromolecular Chemistry & Physics . Dec2016, Vol. 217 Issue 24, p2726-2735. 10p. - Publication Year :
- 2016
-
Abstract
- Six aryl Pd(II) bromide complexes based on perylene diimide derivative (Ar) and phosphine mixed-ligands are successfully synthesized by directly oxidative addition of Ar-Br to the Pd(0) precursor. These complexes with the general formulas ArPdBr(PCy3)2 (PCy3 = tricyclohexylphosphine; Pd1-Pd3) and [ArPdBr(TXP-2,4)]2 (TXP-2,4 = tri-2,4-xylylphosphine; Pd4-Pd6) are stable and can be handled in air at room temperature. By employing the Pd(II) complexes as initiators, Suzuki catalyst transfer polymerization (SCTP) of AB-type fluorene monomer is investigated for preparing polyfluorenes (PFs) with the defined end group. Complexes Pd4-Pd6 with auxiliary TXP-2,4 ligand can initiate polymerization of AB-type fluorene monomer at room temperature, while higher polymerization temperature is required for Pd1-Pd3 with alkyl phosphine PCy3. The obtained polymers are analyzed by matrix-assisted laser desorption ionization-time-of-flight mass spectrometry, which confirms that the Ar group is appended to the terminus of the polymer chain. Moreover, PFs prepared by Pd4-Pd6-catalyzed SCTP bear precisely the Ar group on one chain end and 4- tert-butylphenyl end-capping group on the opposite end, which indicates that Pd4-Pd6 with the bulky TXP-2,4 exhibit better catalytic performance in SCTP. Photoluminescence spectra of the obtained polymers show a dual or a blue emission resulting from the difference of the molecular weight. [ABSTRACT FROM AUTHOR]
- Subjects :
- *POLYFLUORENES
*CATALYSTS
*POLYMERIZATION
*OXIDATIVE addition
*LIGANDS (Chemistry)
Subjects
Details
- Language :
- English
- ISSN :
- 10221352
- Volume :
- 217
- Issue :
- 24
- Database :
- Academic Search Index
- Journal :
- Macromolecular Chemistry & Physics
- Publication Type :
- Academic Journal
- Accession number :
- 120263141
- Full Text :
- https://doi.org/10.1002/macp.201600412