介晶供体-受体-供体体系中的光致电子转移

Photoinduced electron transfer in a mesogenic donor-acceptor-donor system.

作者信息

Peeters Emiel, van Hal Paul A, Meskers Stefan C J, Janssen René A J, Meijer E W

机构信息

Laboratory of Macromolecular and Organic Chemistry Eindhoven University of Technology PO Box 513, (The Netherlands).

出版信息

Chemistry. 2002 Oct 4;8(19):4470-4. doi: 10.1002/1521-3765(20021004)8:19<4470::AID-CHEM4470>3.0.CO;2-F.

DOI:10.1002/1521-3765(20021004)8:19<4470::AID-CHEM4470>3.0.CO;2-F

PMID:12355535

Abstract

A novel donor-acceptor-donor molecule consisting of two oligo(p-phenylene vinylene) (OPV4) units attached to a central perylene bisimide (PERY) core is described. This OPV4-PERY-OPV4 is the first mesogenic molecule that incorporates both p- and n-type semiconducting properties and possesses a liquid-crystalline mesophase, in which donor and acceptor functionalities self-assemble into an ordered material. Upon photoexcitation of the donor, a subpicosecond electron-transfer reaction occurs in OPV4-PERY-OPV4, both in solution and in (ordered) thin solid films. The lifetime of the charge-separated state is significantly longer in (ordered) thin films than in solution as a result of a reduction of geminate recombination by migration and spatial separation of charges in the film.

摘要

描述了一种新型的给体-受体-给体分子，它由连接在中心苝二酰亚胺（PERY）核上的两个聚对苯撑乙烯撑（OPV4）单元组成。这种OPV4-PERY-OPV4是首个兼具p型和n型半导体性质并拥有液晶中间相的介晶分子，在该液晶中间相中，给体和受体官能团自组装成有序材料。在给体发生光激发时，OPV4-PERY-OPV4在溶液和（有序）固体薄膜中均会发生亚皮秒级的电子转移反应。由于薄膜中电荷的迁移和空间分离减少了双电子复合，电荷分离态在（有序）薄膜中的寿命比在溶液中长得多。