Anthracene functionalized terpyridines – synthesis and properties

• Falk Wehmeier and
• Jochen Mattay

Beilstein J. Org. Chem. 2010, 6, No. 54, doi:10.3762/bjoc.6.54

• ]-cycloaddition reaction. A degassed 5·10−5 × M solution of 5a in methylene chloride was irradiated with UV light (λ = 350 nm, Figure 1). The absorption spectrum of 5a (solid line) shows the expected absorption pattern for a compound containing anthryl residues. Upon UV irradiation the absorption decreases which

• establishing the identity of the photoproducts from 5a and 5b after UV irradiation. 1H NMR-spectra of the irradiation products (after evaporation of solvent) indicate that there is more than one reaction pathway, the number and overlapping of peaks (especially in the aromatic region) made assignments

A perfluorocyclopentene based diarylethene bearing two terpyridine moieties – synthesis, photochemical properties and influence of transition metal ions

• Falk Wehmeier and
• Jochen Mattay

Beilstein J. Org. Chem. 2010, 6, No. 53, doi:10.3762/bjoc.6.53

• ), we synthesized the binuclear complex 12, from ruthenium(III) chloride hydrate via the monoterpyridine complex 11 (Scheme 5). The UV–vis-spectra of the binuclear complex 12 in acetonitrile solution are shown in Figure 2 – before (solid), after UV-irradiation (dashed) and after irradiation with vis

• light (dotted). The absorption of the strong MLCT band at λ = 490 nm decreases upon UV-irradiation, while absorption in the visible region of the spectrum increases. This may be regarded as indication that the photochromic reaction of the ligand not only takes place in presence of ruthenium, but also

• absorption decreases upon UV-irradiation, no significant change of the absorption in the visible region occurred. This indicates inhibition of the photochromic reaction of the diarylethene by the MLCT transition, as previously reported for other iron(II) complexes of bisterpyridine thienylethenes [10]. In