In:
Macromolecular Rapid Communications, Wiley, Vol. 39, No. 4 ( 2018-02)
Abstract:
This study reports the first Co 2 (CO) 8 ‐catalyzed [2+2+2] polycyclotrimerization by the transformation of internal ethynyl groups of aromatic diyne monomers. The reaction yields polycyclotrimers of polyphenylene‐type with either hyperbranched or partly crosslinked architecture. The homopolycyclotrimerization of the monomers with two ethynyl groups per one molecule, namely 1,4‐bis(phenylethynyl)benzene, 4,4′‐bis(phenylethynyl)biphenyl, and 4‐(phenylethynyl)phenylacetylene, gives partly crosslinked, insoluble polyphenylenes. The soluble, hyperbranched polyphenylenes are generated via copolycyclotrimerization of 1,4‐bis(phenylethynyl)benzene with 1,2‐diphenylacetylene (average number of ethynyl groups per monomer molecule 〈 2). This one‐step polycyclotrimerization path to hyperbranched or partly crosslinked polyphenylenes is an alternative to the synthesis of these polymers by Diels–Alder transformation of substituted cyclopentadienones. All polyphenylenes prepared exhibit photoluminescence with emission maxima ranging from 381 to 495 nm. Polyphenylenes with a less compact packing of segments are microporous (specific surface area up to 159 m 2 g −1 ), which is particularly important in the case of soluble polyphenylenes because they can be potentially used to prepare microporous layers.
Type of Medium:
Online Resource
ISSN:
1022-1336
,
1521-3927
DOI:
10.1002/marc.201700518
Language:
English
Publisher:
Wiley
Publication Date:
2018
detail.hit.zdb_id:
1475027-2
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