Regiospecific design strategies for 3-arylpolythiophenes with pendant stable radical groups

Grafting density effects, optoelectrical properties and nano-patterning of poly(para-phenylene) brushes

“…42 Although the post-polymerization chemistry used in this work pertains to aromatization of PCHD brushes, the notion of using chemical transformations aer processing and patterning is a general strategy that is growing in practice and attractive for other conjugated polymer systems. [37][38][39][40][41][42] In conclusion, we report optoelectronic properties, graing density effects, and nanopatterning of well-dened conjugated poly(para-phenylene) brushes of various molecular weights that are made by chemical conversion of poly(cyclohexadiene)s having low polydispersities (PDI < 1.1). The use of this "precursor brush" route allows the graing density of the PPP brush to be systematically varied, which seems to impact the effective conjugation length due to trade-offs between packing of chains and intrachain defects brought about by lateral crowding of the chains.…”

Hyperbranched poly(phenylenevinylene) bearing pendant phenoxys for a high-spin alignment

“…The methyl group of 5c was converted to a vinyl group via the Wittig reaction 34 to yield 6 (for details see the Experimental section). 4,6-Dibromo-2-(3',5'-di-tert-butyl-4'-acetoxyphenyl)styrene (10), the isomer of 6, was also synthesized via the same synthetic procedure.…”

Regioregular Polythiophene with Pendant Phenoxyl Radicals: A New High-Spin Organic Polymer

“…Lahti et al , discussed the effects of a structural defect of 1b using computer simulation. They described that the regioregularly substituted pendant groups enhance the planarity of the polythiophene backbone but that the regioirregular head-to-head linkage causes a large thiophene−thiophene torsion of 56°−58° and also increases the torsional angle between the phenyl ring and the thiophene backbone.…”

“…However, molecular weights of the polymers remained low, and Lahti et al could not achieve to any magnetic measurement of the corresponding polyradicals. 14 In this paper, we found that the acetoxy-protected thiophene monomer 2a was not deprotected during the oxidative polymerization with ferric chloride, to yield a high molecular weight and high regioregular polythiophene. We discuss also the regioregular polymer structure, alignment of the pendant phenoxyl spins, and other properties based on π-conjugation of this polythiophene.…”