Thiophene end-capped aromatic analogues, that is, naphthothiophenes, naphthodithiophenes, pyrenothiophene, and benzotrithiophene, can be prepared from commercially available hydroxyarenes in two steps, including (1) a consecutive acid-mediated nucleophilic aromatic substitution of hydroxyarenes with 2-mercaptoethanol, followed by cyclization to form an arene-fused dihydrothiophene, and (2) oxidation of the dihydrothiophene unit to thiophene. (C) 2012 Elsevier Ltd. All rights reserved.
Exploring the “Goldilocks Zone” of Semiconducting Polymer Photocatalysts by Donor-Acceptor Interactions
作者:Yaroslav S. Kochergin、Dana Schwarz、Amitava Acharjya、Arun Ichangi、Ranjit Kulkarni、Pavla Eliášová、Jaroslav Vacek、Johannes Schmidt、Arne Thomas、Michael J. Bojdys
DOI:10.1002/anie.201809702
日期:2018.10.22
Water splitting using polymer photocatalysts is a key technology to a truly sustainable hydrogen‐based energy economy. Synthetic chemists have intuitively tried to enhance photocatalytic activity by tuning the length of π‐conjugated domains of their semiconductingpolymers, but the increasing flexibility and hydrophobicity of ever‐larger organic building blocks leads to adverse effects such as structural
使用聚合物光催化剂进行水分解是实现真正可持续的基于氢的能源经济的关键技术。合成化学家凭直觉尝试通过调整其半导体聚合物的π共轭结构域的长度来增强光催化活性,但是越来越大的有机结构单元所具有的更大的柔韧性和疏水性会导致不利的影响,例如结构崩溃和难以接近的催化位点。为了达到大约2.3 eV的理想光学带隙,使用Stille耦合合成了八种含硫和氮的多孔聚合物(SNP)库,它们具有相似的几何形状,但光学带隙范围为2.07至2.60 eV。这些聚合物结合了π共轭吸电子三嗪(C 3 N 3)和给电子体,含硫部分作为具有永久孔隙的共价键结合的供体-受体骨架。SNP的出色光学特性可实现对挥发性有机化合物的荧光开关检测,并说明了固有的电荷转移效应。