- Synthesis of donor-acceptor-type conjugated polymer dots as organic photocatalysts for dye degradation and hydrogen evolution
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Conjugated polymers (CPs) having various donor-acceptor units in the main chain were synthesized via Suzuki coupling reaction for an organic photocatalyst that can generate reactive oxygen species (ROS) for dye degradation and H2 evolution unde
- Gwon, Yougjin,Jo, Seonyoung,Lee, Hyun-Jun,Lee, Taek Seung,Park, Soo Young
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- Fluorescent OFF-ON polymer chemosensor bonded alternatively with 1,4-dioctyloxybenzene and (R,R)-salen for cascade Zn2+ and chiral recognition
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The synthesis of the chiral main chain polymers 1a-b bonded alternatively with (R,R)-salen and 1,4-dioctyloxybenzene has been described employing a palladium-catalyzed C-C cross-coupling reaction as the key step. They are soluble in common organic solvent
- Sakthivel, Sekarpandi,Punniyamurthy, Tharmalingam
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scheme or table
p. 570 - 576
(2012/08/28)
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- Chiral linear polymers bonded alternatively with salen and 1,4-dialkoxybenzene: Synthesis and application for Ti-catalyzed asymmetric TMSCN addition to aldehydes
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The synthesis of chiral linear polymers 1a-b having salen and 1,4-dioctyloxybenzene as alternate segments has been accomplished. The GPC analysis showed the molecular weights corresponding to ca. 15 (Mw = 10,999, Mn = 9165 and PDI = 1.20) repeating units for 1a and ca. 8 (Mw = 8547, Mn = 7883 and PDI = 1.08) repeating units for 1b. Polymers 1a-b have been studied with Ti(OiPr)4 as a recyclable catalyst for the asymmetric addition of TMSCN to aldehydes while the selectivity of the polymer catalyst is identical to that of the monomer. The reactions are efficient affording the cyanohydrins with up to 88% ee. The selectivity of the polymer based catalyst 9a is found to be the same to that of the monomer 10a. The reaction provides the advantages of simplified product isolation and easy recovery and recyclability of polymer catalyst 9a without any loss of activity or selectivity.
- Sakthivel, Sekarpandi,Punniyamurthy, Tharmalingam
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p. 2834 - 2840
(2011/03/19)
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- Synthesis and optical properties of a poly(2′,5′-dioctyloxy-4,4′,4″- terphenylenevinylene) with high content of (Z) vinylene units
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Poly(2′,5′-dioctyloxy-4,4′,4″-terphenylenevinylene) with (E) configuration of the vinylene double bonds was prepared by Suzuki-Miyaura polymerization of (E)-4,4′-dibromostilbene and 2,5-dioctyloxy-1,4-benzenediboronic acid. Attempts to extend this simple procedure to the synthesis of the polymer with (Z) configuration, starting from (Z)-4,4′-dibromostilbene, were unsuccessful. However, the use of (Z)-4,4′-diiodostilbene and a careful choice of Pd catalyst and experimental conditions, lead to a material with a >95/5 (Z)/(E) ratio of vinylene units. The investigation of optical properties of both the (E) and (Z) polymers evidenced that (Z) linkages act as defects which reduce the effective conjugation length in the polymer backbone.
- Babudri, Francesco,Cardone, Antonio,Cassano, Tiziana,Farinola, Gianluca M.,Naso, Francesco,Tommasi, Raffaele
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p. 2631 - 2636
(2008/09/21)
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- Copolymers of 3,4-ethylenedioxythiophene and of pyridine alternated with fluorene or phenylene units: Synthesis, optical properties, and devices
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We report the synthesis of four conjugated copolymers based on alkylated fluorene or phenylene units which band gap is tuned by the regular insertion of an electron-donating or electron-withdrawing unit, (3,4-ethylenedioxy)thiophene and pyridine, respecti
- Aubert, Pierre-Henri,Knipper, Martin,Groenendaal, Lambertus,Lutsen, Laurence,Manca, Jean,Vanderzande, Dirk
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p. 4087 - 4098
(2007/10/03)
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