π-Conjugated 2,2:6,2-Bis(terpyridines): Systematical Tuning of the Optical Properties by Variation of the Linkage between the Terpyridines and the π-Conjugated System
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Wild, Andreas; Friebe, Christian; Winter, Andreas; Hager, Martin D.; Grummt, Ulrich-Walter; Schubert, Ulrich S.
- Abstract:
- 2,2:6,2-Terpyridines bearing well-defined π-conjugated
substituents at the 4-position are known to exhibit interesting
electronic and optical properties. The systematic variation
of both the spacer unit and the linker in conjugated bis-
(terpyridines) has resulted in a library of π-conjugated systems,
enabling the study of the structure–property relationships
of these materials. We have proven the Huisgen 1,3-
dipolar cycloaddition reaction to be a versatile tool for connecting
conjugated systems, even though the conjugation is
hindered by the introduced triazole moiety. All the terpyridine derivatives were fully characterized by 1H and 13C NMR
spectroscopy, UV/Vis absorption and emission measurements
as well as MALDI-TOF MS. Thin films of the materials
were produced by spin-coating and subsequently characterized.
Because tuning of the band gap of the materials over
a wide range is possible, quantum yields of up to 85% and
extinction coefficients of around 100000 M–1cm–1 could be
observed, the compounds might be promising candidates for
the design of new functional supramolecular materials.
- Year:
- 2010
- Type of Publication:
- Article
- Keywords:
- Conjugation; Supramolecular chemistry; UV Vis spectroscopy; Density functional calculations
- Journal:
- European Journal of Organic Chemistry
- Volume:
- -
- Pages:
- 1859 - 1868