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Functional poly(phenylacetylene)s (PPAs) bearing different azobenzene pendants were synthesized in desirable yields and molecular weight by using organorhodium complexes [Rh(diene)Cl] 2 as catalysts. The structure of the derived azobenzene-functionalized PPAs was characterized by NMR, IR, and UV spectroscopic techniques. Their photoinduced isomerization behavior was monitored with UV–visible...
For the first time, a new disubstituted polyacetylene (P1) was utilized to sense α-amino acids based on a “turn-on” model, through an indirect approach. Thus, first, the strong blue fluorescence of P1 was quenched by trace copper ions efficiently, then the addition of α-amino acids to the P1/Cu 2+ complex could recover the strong fluorescence of P1 to report the presence of α-amino acids....
An optically active poly(phenylacetylene), poly{2-(R)-methyl-2-[4′-(tetradecyloxy)biphenyl-4-yloxy]propyl 4-ethynylbenzoate} (P1) is synthesized in a high yield with a high molecular weight (1.3×10 6 g/mol) by [Rh(nbd)Cl] 2 catalyst. The chemical structure of the polymer is characterized by IR and NMR spectroscopies with satisfactory analysis data. The polymer is soluble in many common...
AB n -type monomers have been widely used for the synthesis of hyperbranched polymers. These monomers, however, suffer from the problems associated with the tendency of their mutually reactive A and B functional groups toward self-oligomerization. We have explored the possibility of synthesizing hyperbranched polymers using A n -type monomers, which are stable and easy to prepare and...
Naphthalene (Nap)-containing poly(diphenylacetylene)s with different spacer lengths (–{C 6 H 5 CC[C 6 H 4 O(CH 2 ) m O–Nap]} n –; P1(m), m=4, 6, 8) are synthesized. The monomers are prepared by etherifications of 1,m-dibromoalkanes with 1-naphthol and 1-(4-hydroxy)phenyl-2-phenylacetylene and are polymerized by TaCl 5 –n-Bu 4 ...
New poly(1-phenyl-1-alkyne)s bearing acrylic pendants (–{(C 6 H 5 )CC[(CH 2 ) m OCOCHCH 2 ]} n –; P1(m), m=3, 9) with high molecular weights are synthesized in high yields by WCl 6 –Ph 4 Sn catalyst. The structures and properties of P1(m) are characterized and evaluated by IR, NMR, TGA, UV, and PL analyses. All the polymers are solution-processable...
Poly(1-alkyne)s containing azobenzene pendants with different spacer lengths and ring substitutents –{HCC[(CH 2 ) m COO–C 6 H 4 –NN–C 6 H 4 –NO 2 ]} n – P1(m) m=3, 8 and –{HCC[(CH 2 ) m COO–C 6 H 3 -o-Br–NN–C 6 H 4 –NO 2 ]} n – P2(m) m=3, 8} are designed and synthesized....
High molecular weight polyacetylenes bearing nonlinear chromophoric pendants poly[4-ethynyl-4′-(N,N-diethylamino)azobenzene-co-phenylacetylene]s [poly(EAAB-co-PA)s] were synthesized in moderate yields by [Rh(nbd)Cl] 2 –Et 3 N. The azo unit in the copolymers can be effectively controlled by the monomer feed ratio. Whereas the homopolymer of EAAB possessed low solubility, all the copolymers,...
New hyperbranched polyarylenes of high molecular weights are synthesized in high yields by copolycyclotrimerizations of diynes 1,4-diethynylbenzene, 4,4′-diethynylbiphenyl, 2,7-diethynylfluorene and 2,5-diethynylthiophene with monoynes 1-heptyne, 1-octyne and 1-dodecyne catalyzed by TaCl 5 –Ph 4 Sn in toluene. All the polymers show good solubility in common organic solvents, possess...
The poly(C 60 -co-styrene)s prepared by radical copolymerizations of C 60 and styrene in bulk were characterized by multiple-detector size-exclusion chromatographs consisting of a refractometer, a differential viscometer, and/or a right-angle laser-light scattering photometer. The multidetector systems enabled the determinations of reliable, absolute molecular weights of...
Mesomorphic properties of a side chain liquid crystalline polyacetylene, poly(11-{[(4′-heptyloxy-4-biphenylyl)carbonyl]oxy}-1-undecyne) (PA9EO7), are investigated using polarized optical microscope, X-ray diffraction, and transmission electron microscope. Polymer PA9EO7 forms enantiotropic smectic A and smectic B phases. It also exhibits an additional high order smectic phase, a sandwich structure...
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